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There are 1339 search results for: K-band Planar and Low-profile Fabry-Perot Cavity Antenna with a Coupled Strip-Slitline Feed Structure



Title: On the Design of a Novel Fractal Antenna for Spectrum Sensing in Cognitive Radio
Abstract: The present paper reports on the development of a novel compact fractal microstrip patch antenna for spectrum sensing in cognitive radio. The geometrical design of the proposed fractal antenna is optimized using nature inspired Moth Flame Optimization (MFO) method. The optimized antenna is having broadband characteristic within two bands (6.206 - 7.864 GHz, 23.56%) and (14.95 - 20 GHz, 28.89%), which are specified for IEEE C-band, Ku-band and K-band applications respectively. The proposed fractal antenna is also having high peak gain of 7.26 dBi at 18.04 GHz and omnidirectional radiation pattern at all frequencies. The performance of the proposed antenna is also validated experimentally by having a comparison of simulated results with the measured results. The proposed design offers 45.54% reduction in antenna physical size (copper required) as compare to a rectangular patch antenna of same size.
Author(s): M. Aggarwal, A. P. S. Pharwaha
File Type: Journal Paper
Issue:Volume: 34      Number: 9      Year: 2019
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Title: K-band Planar and Low-profile Fabry-Perot Cavity Antenna with a Coupled Strip-Slitline Feed Structure
Abstract: In this paper, a design of a planar, lowprofile, and high gain Fabry-Perot cavity antenna for Kband applications is presented. The antenna is consisted of a frequency selective surface (FSS) made of a circular hole array and a feeding structure made of a coupled strip-slitline. The FSS and the slitline both are lithographically patterned on a high permittivity substrate while the stripline is printed on top of a thin and low permittivity substrate. These two substrates are then closely appressed each other to form a planar structure. The measured results show that the proposed antenna has an impedance bandwidth of about 4% (|S11|?-10 dB), a maximum gain of about 10.4 dBi, and a 3-dB gain bandwidth of approximately 2.9% at the resonance frequency of around 20.8 GHz. The antenna’s compact, planar, and lightweight profile, i.e., approximately 4?o × 4?o × 0.24?o of a free-space wavelength at 21.0 GHz makes it promising for a small and efficient source in K-band applications.
Author(s): H. H. Tran, T. K. Nguyen
File Type: Journal Paper
Issue:Volume: 32      Number: 6      Year: 2017
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Title: Design Optimization of a Dual-band Microstrip SIW Antenna using Differential Evolutionary Algorithm for X and K-Band Radar Applications
Abstract: In this work, design optimization and fabrication of a high performance microstrip dual-band antenna are presented using Substrate Integrated Waveguide (SIW) technology with Roger 4350 (εr=3.48 and h=1.52mm). Firstly, the SIW antenna design is considered as a multi-objective multi-dimensional optimization problem for a simple microstrip geometry and its geometrical parameters are optimized efficiently using Differential Evolutionary Algorithm (DEA) in the 3D CST Microwave studio environment based on the gain and return loss characteristics at 12 GHz and 24 GHz. In the second step, for justification of the proposed design method, the optimally designed dual band microstrip SIW antenna has been prototyped. Furthermore, the experimental results are compared with the performance measures of other counterpart designs in literature. Thus, based on the obtained results and comparisons, it can be concluded that the proposed microstrip SIW antenna model and its optimization procedure, is a sufficient and low-cost solution for X and K band radar applications.
Author(s): A. Belen, F. Gunes, P. Mahouti
File Type: Journal Paper
Issue:Volume: 35      Number: 7      Year: 2020
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Title: Design of Controlling Circuit for Varactor Diodes Based on K-band Pattern Reconfigurable Antenna
File Type: Conference Paper
Issue:Volume: 2-3-B Modeling, Design and Optimization of Modern Antennas      Number:      Year: 2017
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Title: CPW Dependent Loss Analysis of Capacitive Shunt RF MEMS Switch
Abstract: CPW (CoPlanar Waveguide) plays major role in design of RF MEMS switch to improve the performance in terms of losses and required bandwidth of operation. This paper proposes the analyses of the mechanical characteristics on the electrical performance of the Capacitive Shunt RF MEMS (CSRM) switch based on various CPW structures and contact area roughness of the switch using electromagnetic 2.5D ADS simulator. The result of momentum method was analyzed up to the K-band frequency of 100 GHz. The result shows that the CSRM switch with two conductor CPW coupler has a maximum isolation of -46 dB with operating bandwidth up to 90 GHz at the resonant frequency of 50 GHz. In order to validate the obtained result, Artificial Neural Network (ANN) has been trained using ADS result. Comparison shows good agreement between ADS and ANN results.
Author(s): S. Suganthi, K. Murugesan, S. Raghavan
File Type: Journal Paper
Issue:Volume: 31      Number: 4      Year: 2016
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Title: A Single-Layer Multi-Band Reflectarray Antenna in X/Ku/K-Bands
Abstract: A new center-fed tri-band reflectarray antenna is presented in this paper. Elements of the reflectarray antenna are circular rings and patches loaded with slots. The proposed antenna operates in three bands (X, Ku and K). The introduced element, has been optimized to achieve large linear phase range at the three bands. Phase compensation is achieved by varying the size of elements. Height of the horn antenna has been optimized to get maximum gain and bandwidth at the three bands.
Author(s): Z. Hamzavi-Zarghani, Z. Atlasbaf
File Type: Journal Paper
Issue:Volume: 31      Number: 5      Year: 2016
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Title: A Metallic 3D Printed K-Band Ridged Horn Antenna
File Type: Conference Paper
Issue:Volume: 2-3-C Advanced Manufacturing Technologies for Microwave Devices      Number:      Year: 2017
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Title: A K/Ka Dual-band Shared-Aperture Array Design
File Type: Conference Paper
Issue:Volume: 8-TP-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu II      Number:      Year: 2018
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Title: A K/Ka Dual-band Shared-Aperture Array Design
File Type: Conference Paper
Issue:Volume: 10-TE-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu III      Number:      Year: 2018
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Title: A K-band Spoof Surface Plasmon Polaritons Bandstop Filter with Capacitively Loaded Split-ring Resonator
Abstract: A K-band bandstop filter based on the spoof surface plasmon polaritons (SPP) and the capacitively loaded split-ring resonator (RSS) is proposed in this paper. The capacitively loaded RSS consists of two parts: the traditional rectangle RSS and a T-type stub placed at the center of the arm microstrip line of the rectangle RSS. Thanks to the capacitively loaded RSS, the operating frequency of the resonator is reduced, which is helpful for miniaturizing the circuit size. The dispersion feature of the capacitively loaded RSS is studied by simulation and the geometrical parameters effects on the filter’s final performance are discussed. A K-band bandstop filter with spoof SPP and capacitively loaded RSS is designed, fabricated and measured to verify the proposed design methodology. The measured results show that the bandstop filter works at 21.05 GHz-22.95 GHz with more than 40 dB insertion loss.
Author(s): P. Chen, L. Li, Z. Wang, K. Yang
File Type: Journal Paper
Issue:Volume: 35      Number: 3      Year: 2020
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Title: A K-Band Low-cost Phase Shifter for Short-Range FMCW Radar Applications
File Type: Conference Paper
Issue:Volume: 3-MA-1 Advances in Phased Array Architectures and Beamforming Technology      Number:      Year: 2018
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Title: Wire Realization of a Tapered Slot Antenna with Reconfigurable Elements
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using FEKO      Number:      Year: 2011
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Title: Wideband Planar Slot Antennas
File Type: Newsletter Paper
Issue:Volume: 19      Number: 1      Year: 2004
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Title: Wideband Microstrip Patch Antenna at 7 GHz
File Type: Conference Paper
Issue:Volume: Student Microwave Design Projects with Sonnet      Number:      Year: 2011
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Title: Wideband Compact Antenna with Partially Radiating Coplanar Ground Plane
Abstract: Many of today's portable communication applications require antennas that are compact, broadband, and easily integrable in a big variety of terminal geometries. This paper presents a compact wideband antenna with partially radiating coplanar ground plane. The prototype of the antenna shows a wide bandwidth (VSWR ? 2) of 92% (from 3.53GHz to 9.5GHz). The antenna also exhibits maximum gain of 3.5dBi and stable radiation patterns over the whole bandwidth. Nevertheless, in this paper the significance of the ground planes on the operating bandwidth are examined with the help of current distribution and discussed in detail with supporting parametric analysis.
Author(s): A. T. Mobashsher, M. T. Islam, N. Misran
File Type: Journal Paper
Issue:Volume: 26      Number: 1      Year: 2011
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Title: Wideband Bow-Tie Slot Antennas with Tapered Tuning Stubs
File Type: Conference Paper
Issue:Volume: Advanced Computational Techniques for Antenna Design      Number:      Year: 2004
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Title: Wide Band Implantable Antenna Operating at MedRadio Band for MBAN Devices
File Type: Conference Paper
Issue:Volume: 1-4-D EM, Antennas and Wireless Power for Biomedical Applications      Number:      Year: 2017
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Title: Waveguides with Exceptional Points of Degeneracy of Order 2, 3, 4 and 6 without Loss and Gain
File Type: Conference Paper
Issue:Volume: S33 Complex Meta-Structures and Applications - II      Number:      Year: 2021
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Title: Vectorial GO and Diffraction Decomposition of Physical Optics Scattering of Dipole Wave from Planar Surfaces in Terms of Modified Edge Representation Line Integrals
File Type: Conference Paper
Issue:Volume: Asymptotic and High Frequency Techniques      Number:      Year: 2005
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Title: Validity of Approximate Boundary Conditions in Analysis of Strip-Loaded Planar and Curved Surfaces
File Type: Conference Paper
Issue:Volume: Poster Sessions 1      Number:      Year: 2007
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Title: UWB Sampler for Wireless Communications and Radar
File Type: Conference Paper
Issue:Volume: Technologies for Ultra-Wideband Communication      Number:      Year: 2005
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Title: UWB Monopole Antenna with Compact Polygon-Shaped Patch for Portable Devices
Abstract: In this paper, a small ultra wideband (UWB) antenna with co-planar waveguide (CPW) feed, consisting of a polygon-shaped design on the patch and a ground plane truncated with two mirror rectangular–shaped notches is designed for ultra wideband (UWB) applications. In this proposed antenna, through increasing the number of cuts inside the initial patch, a proper control on the upper frequency of the band can be achieved. The overall dimension of the antenna is 19×19 ×1 mm3 and fed by 50 ? coplanar waveguide. The proposed antenna is developed and its VSWR is compared with the simulated result. The proposed antenna operates in the adopted bandwidth (3.1 GHz-10.6 GHz) with VSWR < 2, and covers it very well from 3 GHz to 14.9 GHz, which provides fractional bandwidths of more than 132%. The effect of the ground plane notch on the optimization of the VSWR is discussed in detail.
Author(s): T. Sedghi, V. Rafii, M. Moosazadeh
File Type: Journal Paper
Issue:Volume: 29      Number: 1      Year: 2014
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Title: UWB MIMO Antenna for High Speed Wireless Applications
Abstract: The paper proposes a MIMO antenna composed of two elements in the form of UWB monopole antennas. Polarization diversity of the proposed antenna is obtained locating the two elements perpendicularly on a common substrate. Also the isolation between elements is accomplished without using any extra decoupling structures. The two monopoles antennas with half elliptical shape are fed with asymmetric coplanar strip (ACS). The presented antenna is located on substrate 48 × 28 mm2 in total size. The distance between the two elements is 15 mm that is 0.15λ0 at 3GHz. The antenna was designed to work effectively from 3 to 11.5 GHz with reflection coefficient better than -10 dB and isolation lower than 18 dB. In addition, antenna with elements located in parallel was designed to show the advantage of the original design. Envelope correlation coefficient, diversity gain and channel capacity loss document the antennas behavior. The antenna was fabricated and measured. Measurement validated the simulation and showed that the designed antenna can be well applied in UWB MIMO systems.
Author(s): A. A. Ibrahim, J. Machac, R. M. Shubair
File Type: Journal Paper
Issue:Volume: 34      Number: 9      Year: 2019
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Title: USING THE FDTD METHOD TO MODEL THE REFLECTION COEFFICIENT OF A VIVALDI TAPERED SLOT ANTENNA FED THROUGH A PLANAR BALUN
Abstract: In this paper, the Time-Domain (FDTD) method was used to determine the reflection coefficient vs. frequency of a Vivaldi Tapered Dual-Slot Antenna fed through a planar balun. The reflection coefficient at the input port of the feed stripline was determined through the separate computation of the reflection coefficient of representation of the antenna section and the scattering matrix of the balun, assuming that the electromagnetic coupling between these sections was negligible. Experimental results, which were obtained on a prototype of this structure, confirmed the validity of the proposed approach and demonstrate that the coupling of the model. [Vol. 12, No. 3 (1997), pp 26-30]
Author(s): G. Biffi Gentili, R Braccini, M. Leoncini, G. Biffi Gentili, R Braccini, M. Leoncini
File Type: Journal Paper
Issue:Volume: 12      Number: 3      Year: 1997
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Title: Using Efficient Model-Based Parameter Estimation for Pole-Free Solutions of Modal Propagation Constants, as Applied to Shielded Planar Structures
Abstract: A fast and efficient adaptive sampling algorithm is applied to model-based parameter estimation of a Method-of-Lines implementation of two- and three-layer shielded planar structures, creating a pole-free function for the calculation of the propagation constants. The technique minimizes the number of characteristic equation evaluations, and hence reduces the computation time by orders of magnitude when compared to methods using the characteristic equation directly. Examples of a shielded microstrip line and a finline structure are shown below. Between 3 and 15 evaluations of the characterisic function are typically required per determination of an imaginary or real zero.
Author(s): Robert Lehmensiek, Petrie Meyer, Robert Lehmensiek, Petrie Meyer
File Type: Journal Paper
Issue:Volume: 16      Number: 1      Year: 2001
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Title: Use of MW Studio in the Implementation of Metamaterial Configurations in Planar Circuit Technology
File Type: Conference Paper
Issue:Volume: CST Modeling and Analysis      Number:      Year: 2007
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Title: Uniform Sampling Procedure for Constrained Surrogate Modeling of Antenna Structures
File Type: Conference Paper
Issue:Volume: S33 Electromagnetic Simulation for RF and Microwave Design Optimization      Number:      Year: 2018
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Title: Ultra-wideband Planar Log-periodic Slot Antenna with Exponential Shapes on Slot Edges
Abstract: An improved method of using exponential curve shape on edges of log-periodic slots to decrease resonances and further reduce the antenna size is proposed. The proposed method is adopted to design a planar log-periodic slot antenna for ultra-wideband (UWB) applications. Numerical investigation shows that resonant frequencies can be decreased around 12.3% in low frequencies compared with the conventional planar log-periodic slot antenna with regular shape on edges of slots. Measured and simulated reflection coefficients and radiation patterns of the proposed antenna agree well with each other to demonstrate the validity. The measured |S11| shows that the operating frequency range (|S11| below -10 dB) is from 2.9 GHz to 11.36 GHz, covering the UWB spectrum (3.1 – 10.6 GHz). The proposed antenna has good radiation characteristics and antenna gains. The proposed antenna is a good candidate for the UWB applications.
Author(s): W.-C. Weng, M.-C. Chang
File Type: Journal Paper
Issue:Volume: 34      Number: 9      Year: 2019
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Title: Ultra-Wideband Planar Antennas: Slot vs. Monopole
File Type: Conference Paper
Issue:Volume: S44 EM Modeling Using FEKO I      Number:      Year: 2016
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Title: Ultra-Wideband Planar Antenna with Notched Bands at 3.5/5.5 GHz
Abstract: In this paper, a microstrip planar antenna with notch bands at 3.5/5.5 GHz is proposed for ultra- wideband communication. An e-shape parasitic slit and an inverted C-shape slit are imprinted beneath the radiating patch to generate notch bands to suppress the interference from WiMAX and WLAN respectively. The experimental results confirmed that the fabricated prototype with a very small size has achieved an UWB operating band for VSWR ? 2 with two notched bands covering frequencies of 3.32 - 3.76 GHz and 5.2 - 5.92 GHz. The presented design achieved a good gain except at notched bands and exhibits stable omnidirectional radiation patterns. In this design, filter elements are embedded only on one side of the substrate without cutting any slot/s in the radiating element/ground plane and no modification of the patch or the ground plane is required which gives the proposed design an advantages over many designs reported for the same applications.
Author(s): R. Azim, M. T. Islam
File Type: Journal Paper
Issue:Volume: 31      Number: 4      Year: 2016
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Title: Ultra-wideband Flexible Implantable Antenna for Wireless Capsule Endoscopy System with Performance Improvement
Abstract: The implantable antenna is an important part of the wireless capsule endoscopy (WCE) system to achieve wireless communication. This paper designed an ultra-wideband flexible implantable antenna for wireless capsule endoscopy system. With a very wide bandwidth, the antenna can completely cover the industrial, scientific, and medical frequency bands (ISM, 2.4-2.48 GHz) and Wireless Medical Telemetry Service (WMTS, 1.395-1.4 GHz). The expanded size of the proposed antenna is 18mm× 10mm× 0.1mm. The conformal technology of the antenna has further reduced the space of the system and achieved miniaturization. The capsule antenna in this paper is a compact planar monopole antenna fed by a coplanar waveguide, and it uses a flexible material as a dielectric substrate to achieve the conformal shape of the antenna. U-shaped ground branch (UGB) and a loaded split ring resonator (SRR) structure were used to further improve the antenna performance. Simulation and measurement results were basically the same. On the premise of radiation safety and miniaturization of the antenna, the ultra-wideband operation of the antenna was realized. This antenna design provided reference value for the design and application of the capsule antenna.
Author(s): Y. Feng, P. Chen, S. Pan, G. Li
File Type: Journal Paper
Issue:Volume: 36      Number: 6      Year: 2021
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Title: Ultra-Wideband Bandpass Filter Based on Parallel-Coupled Microstrip Lines and Defected Ground Structure
Abstract: A compact planar microstrip bandpass filter with 3.1 GHz ? 10.6 GHz bandwidth, below 1 dB in-band insertion loss, 0.2 ns ? 0.6 ns group delay and out-of-band rejection level better than - 10 dB is presented for ultra-wideband (UWB) applications. The desired UWB is realized by etching a defected ground structure (DGS) in the ground plane and loading a folded steppedimpedance stub by one of the coupling microstrip lines. This can offer two transmission zeros at lower and upper edges of the passband, which improve the passband selectivity and out-of-band rejection significantly. An equivalent lumped circuit model is introduced; the result of the circuit model fits the EM model well. The simulated and measured results are in good agreement
Author(s): L. Yang, Y. Hongchun, W. Yawei, X. Shaoqiu
File Type: Journal Paper
Issue:Volume: 28      Number: 1      Year: 2013
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Title: Ultra-Wideband Antenna Performance Comparison
File Type: Conference Paper
Issue:Volume: S27 EM Modeling Using FEKO II      Number:      Year: 2018
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Title: U-Shaped Microstrip Patch Antenna
File Type: Conference Paper
Issue:Volume: Student Projects in Sonnet      Number:      Year: 2012
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Title: Tunable Bandstop Filter Based on Split Ring Resonators Loaded Coplanar Waveguide
Abstract: In this paper, a novel electrical tunable bandstop filter based on coplanar waveguide (CPW) loaded with split ring resonators (SRRs) is proposed. The unit cell of the bandstop filter is formed by etching single SRR on the CPW back substrate side, and the SRRs can be excited by the CPW slot’s magnetic field. Lumped equivalent circuit models are developed to analyze the frequency responses, and it shows that by loading the common cathode varactor diodes at the split region of the SRR outer ring, the resonant frequency of the bandstop filter can be electronically adjusted by tuning the reverse voltage of the varactor diodes. The prototype with overall size of 26.6 mm ? 50 mm ? 0.508 mm was designed and fabricated to validate the proposed structure. The measured tunable resonant frequency of the fabricated bandstop filter is from 2.19 GHz to 2.31 GHz while a reverse bias voltage is varying from 0 V to 30 V. It also shows that the -10 dB bandwidth is less than 45 MHz.
Author(s): Q. Xiang, Q. Feng, X. Huang
File Type: Journal Paper
Issue:Volume: 28      Number: 7      Year: 2013
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Title: Triple-Band GCPW Rectifier for Harvesting EM Energy
File Type: Conference Paper
Issue:Volume: 3-3-D Wireless Power Transfer and Harvesting      Number:      Year: 2017
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Title: Triple Notch UWB Antenna Controlled by Novel Common Direction Pentagon Complementary Split Ring Resonators
Abstract: A small-size CPW-feed multi-band planar monopole antenna is presented. A SwallowShaped-Patch (SSP) that covers the UltraWideband (UWB) frequency range is used in the proposed design. To create a multi-band antenna, several narrow pentagon slots, acting as resonance paths, can be integrated with the SSP antenna. Triple-band antennas are simulated and good results are obtained, while showing a very sharp band-rejection performance at 3.92 GHz, 5.34 GHz and 5.88 GHz, respectively. The antennas have omnidirectional and stable radiation patterns across all the relevant bands. Moreover, a prototype of the triple-band antenna is fabricated and measurement results are compared with simulation results.
Author(s): B. Yan, D. Jiang, J. Chen
File Type: Journal Paper
Issue:Volume: 29      Number: 5      Year: 2014
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Title: Triangular-Arranged Planar Multiple-Antenna for UWB-MIMO Applications
Abstract: A triangular-arranged (TA) planar multiple-antenna is proposed. It consists of three ultra-wideband (UWB) planar monopole antenna elements, with the centers and the ports of the elements arranged at the vertexes of two regular triangles, thus the polarization of each element is 120° different. The performance of the TA multiple-antenna is investigated by simulation and measurement, and the measured results agree with the simulated ones in reasonable precision. Within the ultra-wide bandwidth of 3.4 GHz – 12 GHz, the return loss at each port is better than 10 dB, and the isolation between any two ports is higher than 20 dB. Furthermore, good omni-directional radiation pattern is obtained over the interesting frequency band. A linear-arranged (LA) threeelement multiple-antenna is compared with the proposed TA antenna. Comparison between the TA antenna and the LA antenna validates the advantages of the proposed one, which consequently is suitable for UWB-MIMO applications.
Author(s): X.-S. Yang, S.-G. Qiu, J.-L. Li
File Type: Journal Paper
Issue:Volume: 29      Number: 1      Year: 2014
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Title: Transmission plane models for parallel-plane power distribution system and signal integrity analysis
File Type: Conference Paper
Issue:Volume: Applied CEM for EMC Applications      Number:      Year: 2006
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Title: TRANSMISSION AND REFLECTION CHARACTERISTICS OF A CLASS OF MODIFIED COPLANAR WAVEGUIDE STRUCTURES
Abstract: In this paper, several geometries of a class of grounded coplanar waveguide (GCPW) are investigated using the finite difference time domain (FDTD) method, and their losses are computed. A uniform grounded coplanar waveguide (GCPW) structure is used as a reference case for the other non-uniform geometries. First, this reference case is studied. For this case, four geometries are proposed to study the transmission and loss effect of replacing parts of the dielectric substrate with free space. Afterwards, two new geometries are simulated to study the effect of introducing a neck and a gap in the microstrip feeding line, with and without a bridge that connects the two parts of the microstrip feeding line separated with the gap. The effect of adding a PEC cap above the microstrip feeding line, and connecting the two side ground planes, is also studied. The conductor attenuation is studied for the basic GCPW geometry. The power losses are also calculated for the uniform geometries. The line impedance is calculated for all geometries at several points.
Author(s): Abdelnasser. A. Eldek, Atef. Z. Elsherbeni, Charles. E. Smith, Abdelnasser. A. Eldek, Atef. Z. Elsherbeni, Charles. E. Smith
File Type: Journal Paper
Issue:Volume: 17      Number: 2      Year: 2002
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Title: Transformer-Based Dual-Mode VCO for Multi-Mode Multi-Standard Receiver
Abstract: The proposed VCO in this paper is used for multi-mode multi-standard wireless transceiver. The overall scheme includes two VCOs, each VCO adopts transformer-based structure. On-chip transformer which uses coplanar central tap structure and adopts the top metal winding is present. The primary and secondary inductances adopt octagon differential structure. Electromagnetic field (EM) simulation is carried out by using ADS Momentum. Negative conductance unit adopts the current reuse of cross coupled MOSFET. Oscillation mode can be chosen by switch. The primary and secondary inductances of the transformer are connected with 4 bit binary switches capacitor arrays and varactors under different oscillation modes to extend the range of frequency adjustment. Measurement results show that the frequency range is from 1.2 to 7.3 GHz and the phase noise at 1 MHz offset is less than -80 dBc/Hz in the whole frequency range.
Author(s): X. Fan, X. Shi, L. Tang
File Type: Journal Paper
Issue:Volume: 31      Number: 8      Year: 2016
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Title: Time-Domain Magnetic Shielding of a Thin Conducting Screen Against a Small Loop
File Type: Conference Paper
Issue:Volume: S22 Advances on Time Domain Modeling and Design I      Number:      Year: 2019
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Title: Time-Domain Magnetic Shielding Effectiveness of Planar Stratified Shields
File Type: Conference Paper
Issue:Volume: S25 Time Domain Methods II      Number:      Year: 2018
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Title: The Tilted-Ellipse Representation of Standing-Wave Patterns.
File Type: Conference Paper
Issue:Volume: Advances in CEM      Number:      Year: 2004
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Title: The Reduction of Force Component Produced by Short Sides by Analyzing the Corner of Coil in Planar Motor with Halbach Magnet Array
Abstract: The planar motor with moving-magnet is purely levitated by the stator coils. The forces produced by coils are calculated with the analytical model of magnet array and coil surface model for applying to the real time control. Take the coil and the Halbach magnet array which is at 45 degree with the long side of coil for analysis. The force component produced by short sides can be eliminated for conveniently controlling when the length of coil takes certain dimension. In practice, the force component produced by short sides is small but not zero. There are two reasons, one is the higher harmonics and the other is the corner segments of coil. The force integral expressions of coil corner segments are given by the Lorenz force law. Then the forces numerically calculated with harmonic model and coil full model are verified by comparing with the magnetic surface charge model and finite element model. In order to reduce the force component produced by short sides, the different corners of coil are analyzed. Comparing the forces of different corners of coil, the force component produced by short sides can be significantly reduced with slightly change of the other force components.
Author(s): G. Liu, S. Hou, W. Xiao
File Type: Journal Paper
Issue:Volume: 36      Number: 1      Year: 2021
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Title: The Planar E Multiple Arm Antenna
File Type: Conference Paper
Issue:Volume: Advances in Electromagnetic Modeling by WIPL-D software I      Number:      Year: 2009
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Title: The Optimal Design of Real Time Control Precision of Planar Motor
Abstract: In this paper, the Halbach permanent magnet array with 2 segments per pole is selected for analysis. The harmonics that the harmonic numbers for the lx and ly-direction in local coordinate system are equal to each other are set as a pair for transformation. Then the expressions of the magnetic flux density distribution of the Halbach array in global coordinate system are derived. The dimensions of the coil are parameterized. The force and torque exerted on the Halbach array by a coil are calculated by Lorentz force law. The first three harmonics are chosen for real time control by analyzing the ratio of each harmonic in the total harmonics. The harmonic model has good performance on torque by comparing with the models used before. As for the force, the errors can be significantly reduced by optimizing the parameterized dimensions of coil because of the cosine or sine form error figures. The optimized model has good precision on both force and torque. The same method can be applied on the Halbach permanent magnet array with different segments per pole.
Author(s): G. Liu, Y. Wang, X. Xu, W. Ming, X. Zhang
File Type: Journal Paper
Issue:Volume: 32      Number: 10      Year: 2017
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Title: The Joy of Computing with Volume Integrals: Foundations for Nondestructive Evaluation of Planar Layered Media
Abstract: As an alternative to the finitedifference time-domain (FDTD), the finiteelement method (FEM), and the method of moments (MoM) based on the surface integral equation (SIE), a volume-integral equation (VIE) approach using the method of moments and conjugate-gradient methods is presented to address a wide variety of complex problems in computational electromagnetics. A formulation of the volume integral method is presented to efficiently address inhomogeneous regions in multi-layered media. Since volume element discretization is limited to local inhomogeneous regions, numerical solutions for many complex problems can be achieved more efficiently than FDTD, FEM, and MoM/SIE. This is the first of a series of papers dealing with volume-integral equations; in subsequent papers of this series we will apply volume-integrals to problems in the field on nondestructive evaluation.
Author(s): H. A. Sabbagh, R. K. Murphy, E. H. Sabbagh, J. C. Aldrin, J. S. Knopp, M. P. Blodgett
File Type: Journal Paper
Issue:Volume: 25      Number: 9      Year: 2010
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Title: The Design of Planar Slot Arrays Revisited
Abstract: Design procedures for planar waveguide slot arrays have been known and used for years, but the inexperienced designer is often faced with a number of practical problems when trying to implement them, especially in the case of larger arrays consisting of sub-arrays. Some helpful hints concerning the numerical implementation are provided. These include an effective procedure to avoid the necessity of good initial guesses for the unknown dimensions and recommendations for the subdivision of the nonlinear equations into smaller groups. Other practical aspects which are not explicitly defined elsewhere in the literature, are also addressed.
Author(s): J.C. Coetzee, J. Joubert, J.C. Coetzee, J. Joubert
File Type: Journal Paper
Issue:Volume: 15      Number: 1      Year: 2000
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Title: The Design of 276 GHz Triple-Push VCO Based on 65nm CMOS Process Using Slow-Wave Effect
File Type: Conference Paper
Issue:Volume: 4-P4-C THz Antenna, Circuit and System      Number:      Year: 2017
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Title: The Design and Analysis of a Static and Extremely Low-Frequency Magnetic Field Stimulation Platform for Cell Prolifation Inhibition
File Type: Conference Paper
Issue:Volume: 1-SP-3 Advances in Electromagnetic Theory and Simulation Techniques I      Number:      Year: 2018
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Title: The Application of Chirp Z-Transform in Fast Computation of Antenna Array Pattern
Abstract: As an essential means of evaluating antenna array performance and the basis of antenna array design, numerical computation of antenna array pattern is very important. Computation of antenna array pattern by using straightforward summation is very time consuming especially for planar array with many elements. Moreover, in some applications such as antenna array synthesis, huge number of repeated pattern computations is needed that the consumed time is intolerably long. Although the computation can be accelerated by fast Fourier transform (FFT) when the elements are equally spaced by half of a wavelength because the array factor and the element excitation currents is a Fourier transform pair, in general, FFT is not applicable. In this paper, the chirp z-transform (CZT) is introduced to accurately and efficiently compute pattern of general linear or planar antenna arrays. Numerical examples confirm that CZT is flexible, efficient, and accurate.
Author(s): C. Zhang, A. Qing, Y. Meng
File Type: Journal Paper
Issue:Volume: 34      Number: 11      Year: 2019
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Title: Terahertz High-Efficiency High-Gain Plate Antenna Array
File Type: Conference Paper
Issue:Volume: 1-4-B THz Antenna, Circuit and System Research in EHF Integrated System Lab. of UESTC      Number:      Year: 2017
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Title: Terahertz Dielectric Sensor Based on Novel Hexagon Meta-Atom Cluster
Abstract: In this paper, we report meta-atom sensor based on planar hexagon split ring resonators. The subwavelength structure is designed to operate in terahertz frequency band. A modified version of split ring resonator geometry is simulated for sensing dielectric changes by placing thin dielectric layers as sample materials on the full frontal surface of sensor. The effective parameters are retrieved using Nicolson-Ross and Weir method. The meta-atom sensor shows significant changes in resonant frequency as a function of transmission (magnitude of S21 parameter) response, which was observed when the sensor is loaded with the dry layer of dielectric materials of different dielectric constants. This paper contributes new shape of metaatom structure used as a terahertz dielectric sensor. The proposed sensor can be used in multitudinous terahertz near field sensing applications.
Author(s): N. Naeem, A. Ismail, A. R. H. Alhawari, M. A. Mahdi
File Type: Journal Paper
Issue:Volume: 30      Number: 9      Year: 2015
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Title: Techniques to Improve Ultra Wide Band Performance of Planar Monopole Antenna
File Type: Conference Paper
Issue:Volume: Wideband Antennas      Number:      Year: 2005
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Title: TD-UAPO Solutions for the Diffraction by Co-Planar Adjacent Blocks
File Type: Conference Paper
Issue:Volume: S03 Algorithms for Unique Applications I      Number:      Year: 2017
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Title: T-Shaped Broadband Dual Polarized Microstrip Patch Antenna
File Type: Conference Paper
Issue:Volume: Projects in Sonnet      Number:      Year: 2013
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Title: Synthesis of Uniformly Excited Sparse Planar Array Based on Matrix Mapping and Genetic Algorithm
File Type: Conference Paper
Issue:Volume: 5-P-1 Poster      Number:      Year: 2018
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Title: Surface Plasmon Resonance Based on Attenuated Total Reflection
File Type: Conference Paper
Issue:Volume: 1-SP-3 Advances in Electromagnetic Theory and Simulation Techniques I      Number:      Year: 2018
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Title: Superformula-Based Compact UWB CPW-Fed-Patch Antenna With and Without Dual Frequency Notches
Abstract: This paper presents two new designs of UWB coplanar waveguide (CPW)-fed-patch antennas operating in the FCC frequency band (3.1-10.6 GHz). The first design uses the superformula to produce a circular patch with sawtooth-like circumference. As compared to a regular circular patch antenna whose diameter is 25 mm, the proposed circular patch has a smaller diameter of 18.2 mm. Moreover, the proposed antenna covers the entire FCC band unlike a regular circular patch of the same radius. The second design introduces two frequency notches at 3.3-3.8 GHz (WiMAX) and 5-5.9 GHz (WLAN) using two arc shaped circular slots etched on the circular patch and a split-ring resonator (SRR) that is placed on the opposite side of the substrate. Measurements and simulations using HFSS show that the return loss is better than 10 dB across the band except at the two notch locations in Design II. Results are also presented for the radiation pattern and peak gain of both designs. Each of the proposed antennas has a compact size of 24 mm x 19 mm on a 1.5 mm Rogers Substrate (epsilon r=3.85).
Author(s): A. A. Omar, S. Naser, M. I. Hussein, N. I. Dib, M. W. Rashad
File Type: Journal Paper
Issue:Volume: 32      Number: 11      Year: 2017
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Title: Substrate Integrated Waveguide-Fed Tapered Slot Antenna With Smooth Performance Characteristics Over an Ultra-Wide Bandwidth
Abstract: We present an ultra-wide extended Kband (18 GHz – 30 GHz) planar linear tapered slot antenna (LTSA) design. From a parametric study involving eight designs, the best compromise LTSA is selected in terms of flattest gain and beam width and most symmetric beam width. The design is antipodal with alumina (?r = 10) substrate and fed with substrate integrated waveguide (SIW). Regular corrugations improve cross-polarization, input return loss, and gain. Numerical simulations use finite element analysis and time domain finite integration technique field solvers. The resulting design has half power beam widths (HPBW) of only ± 3.2° and ± 2.5° variation in frequency in the E- and H-planes, respectively. Cross-polarization levels at boresight are 35.7 dB at 18 GHz and 17.4 dB at 30 GHz, return loss is better than -11.7 dB and gain is 9.23 dB with ± 0.40 dB variation with frequency. Alternatively, for imaging systems requiring efficient illumination of a reflector or focusing elements, a second resulting design shows near-perfect beam symmetry with HPBWE/HPBWH = 0.91. These two LTSAs are good candidates for dual-polarization focal plane array feed applications in astronomy imaging.
Author(s): L. S. Locke, J. Bornemann, S. Claude
File Type: Journal Paper
Issue:Volume: 28      Number: 5      Year: 2013
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Title: Study, Design and Fabrication of a CPW Fed Compact Monopole Antenna with Circular Polarization for Ultra Wide Band Systems Application
Abstract: A compact circularly polarized square slot antenna (CPSSA) is presented in this paper, which is appropriate for UWB applications requiring high data rate transmission. This antenna operates across 2.8 GHz to 10.8 GHz with an impedance bandwidth (IBW) of 117.6% for VSWR less than or equal to 2. The antenna consists of a trapezoidal shaped radiation patch which is fed through a coplanar waveguide (CPW) and includes two inverted L-shaped ground arms at the two opposite corners of the slot to excite two orthogonal resonant modes for circular-polarization (CP) radiation. Furthermore, two square slits at the two other opposite corners of the slot are applied to enhance its IBW. The antenna exhibits CP bandwidth of 50.5% across 3.7 GHz-6.2 GHz, which is suitable for WLAN, WiMAX and C-bands. In addition, the antenna has a considerably compact volume of 25×25×0.8 mm3. The measured and simulated results confirm the usefulness of the antenna for practical applications.
Author(s): M. Shokri, S. Asiaban, A. Amiri
File Type: Journal Paper
Issue:Volume: 32      Number: 9      Year: 2017
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Title: Study of MRI Transmit/Receive Coils for 7T/300 MHz Application
File Type: Conference Paper
Issue:Volume: S48 Computational EM in MRI      Number:      Year: 2021
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Title: Strongly Coupled Wireless Power Transfer With Conformal Structures
File Type: Conference Paper
Issue:Volume: Wireless Powering of Devices and Energy Harvesting      Number:      Year: 2013
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Title: Splitting of Material Cells and Averaging Properties to Improve Accuracy of the FDTD Method at Interfaces
Abstract: In this paper we present a simple modification to the traditional Finite Difference Time Domain (FDTD) method for treating material cells. The Yee cell is split into 8 smaller material subcells so that each E and H field point is considered to be located at the crosspoint of 8 cells with differing material properties. Thus there is no longer an overlap of the material cells associated with the components of the E and H fields. The 8 material properties are averaged at each crosspoint. Since the averaging is done outside the time marching loop there is little increase in the total computational time. Numerical results are shown for a sinusoidal plane wave scattering from a dielectric sphere. These results are compared with the exact Mie solution and the traditional material cell method along different cuts through the sphere. The splitting and averaging is shown to give improved amplitude accuracy in the vicinity of the sphere. Improvement is also observed at planar interfaces angled with respect to the grid. An additional benefit of this subcell formulation is that objects may be modeled with twice the geometrical resolution without increasing the size of the staggered grid.
Author(s): R. S. Schechter, M. Kragalott, M. S. Kluskens, W. P. Pala, R. S. Schechter, M. Kragalott, M. S. Kluskens, W. P. Pala
File Type: Journal Paper
Issue:Volume: 17      Number: 3      Year: 2002
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Title: Spherical Conformal Bow-Tie Antenna for Ultra-Wide Band Microwave Imaging of Breast Cancer Tumor
Abstract: In this paper, contribution of spherical conformal ultra-wide band (UWB) bow-tie antenna on enhancement of breast tumor detection capability of a radar-based microwave imaging system is investigated through simulation, demonstrating the potential of the novel antenna element used in a half-spherical antenna array surrounding the breast. The designed conformal antenna operates efficiently across the band from 1 GHz to 8 GHz, and it is immersed in a coupling medium in order to get a good impedance matching with the breast. Images are successfully formed by using delay-and-sum (DAS) algorithm for the detection of a spherical tumor model with 2 mm diameter. The tumor is located at 40 mm depth inside three different breast phantom models with homogeneous fatty breast tissue, quasiheterogeneous mix of fibro-glandular and fatty breast tissues and homogeneous fibro-glandular tissue, respectively. Fidelity factor, indicating the maximum cross correlation between observed and excitation pulses, of the conformal bow-tie is found to be around 13% more than that of the planar bow-tie at 40 mm depth. The use of the spherical conformal antenna presents an excellent solution to increase tumor responses by at least 2.3 dB, as well as to decrease mutual coupling effects between array elements, compared to the same system with planar bow-tie antennas
Author(s): I. Unal, B. Turetken, C. Canbay
File Type: Journal Paper
Issue:Volume: 29      Number: 2      Year: 2014
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Title: Space-Mapping-Enhanced Kriging Surrogates for Accurate Modeling of Microwave Structures
File Type: Conference Paper
Issue:Volume: Optimization Methods for EM Applications      Number:      Year: 2012
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Title: Space-Frequency Domain Iterative Method for Modes Analysis of Planar Waveguides
Abstract: We describe a space-frequency domain iterative algorithm to analyze the modes of planar optical waveguides. The one dimensional Maxwell equation was transformed into space-frequency domain by Fourier transform, and became an integral equation which could be solved by an iterative method. For any refractive index profiles, the effective index and mode field distribution are given simultaneously. The numerical result shows that this method is accurate and flexible for planar optical waveguides with any structure.
Author(s): L. Bingxin, Z. Baorong
File Type: Journal Paper
Issue:Volume: 30      Number: 8      Year: 2015
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Title: Sonnet Modeling and Simulation of Wilkinson Power Divider with OhmegaPly Resistor
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulations using Sonnet      Number:      Year: 2011
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Title: Sonnet in RF Power Amplifier Design
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulations using Sonnet      Number:      Year: 2011
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Title: Sonnet in Directional Coupler Design
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulations using Sonnet      Number:      Year: 2011
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Title: Small Square-Shaped Slot Antenna for Wearable Passive UHF RFID Tags
File Type: Conference Paper
Issue:Volume: 3-2-B RFID Antennas and Systems      Number:      Year: 2017
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Title: Slotted Waveguide Transitions for Spatial Power Combining
File Type: Conference Paper
Issue:Volume: Posters Session 2      Number:      Year: 2003
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Title: SIW Rotman Lens with Planar Slot Array Antenna at Ku-band
Abstract: A multi-beam antenna, which is the combination of a Rotman lens and a planar slot array antenna, is designed in this paper. The lens and the slot array are designed for 15.5 to 16.5 GHz frequency range and implemented in the same substrate using SIW structure. The Rotman lens with 7 input ports and 7 output ports are connected to a planar slotted array antenna with 7 waveguides. This multi-beam antenna consists of seven beams at angles of 0°, ±10°, ±20° and ±30° symmetrically. This antenna is designed for terrestrial and satellite applications, where the low cost, low profile and light multi-beam antennas are needed. Simulated and measured results show that the amplitude and phase distributions and scattering parameters of the antenna are in good agreement. In addition, the SLL, HPBW, main beam direction and cross polarization levels of all the radiation patterns are desirable.
Author(s): S. A. Hosseini, Z. H. Firouzeh, M. Maddahali
File Type: Journal Paper
Issue:Volume: 32      Number: 6      Year: 2017
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Title: SIW like Bull-Eye Antenna
File Type: Conference Paper
Issue:Volume: S04 Printed, Flexible and Reconfigurable Antenna Implementations      Number:      Year: 2020
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Title: SIW Circularly-Polarized Filtering Antenna
File Type: Conference Paper
Issue:Volume: 1-P1-A Student Paper Contest      Number:      Year: 2017
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Title: Single-, Dual- and Wide-Band Frequency-Reconfigurable Antenna with Annular Ring Slots
Abstract: This paper presents a frequency reconfigurable antenna enabled using a pair of annular ring slots on a coplanar waveguide (CPW) ground plane. Its initial wideband operation mode from 3 GHz to 6 GHz can be reconfigured into six additional modes: a dual–band mode and five single-band modes, with minimum reflection coefficients (S11) of -10 dB. For demonstration and proof-of-concept purposes, metal switches have been used to represent the switches in simulations and measurements. The ON state is emulated using shorted metal switches, whereas the OFF state is emulated using an open. Good agreements are indicated for simulated and measured S11 and radiation patterns.
Author(s): M. C. Lim, S. K. A. Rahim, M. R. Hamid, P. J. Soh, M. I. Sabran, A. A. Eteng, M. R. Ramli
File Type: Journal Paper
Issue:Volume: 32      Number: 11      Year: 2017
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Title: Single Layer Vivaldi Antenna Feed Analysis
File Type: Conference Paper
Issue:Volume: S35 EM Modeling Using FEKO II      Number:      Year: 2019
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Title: Simulation-Driven Design of Microstrip-to-CPW Transitions Using Variable-Fidelity EM Models
File Type: Conference Paper
Issue:Volume: Electromagnetic-Simulation-Driven-Design: Modeling and Optimization      Number:      Year: 2011
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Title: Simulation of Compact Electromagnetic Bandgap Antennas
File Type: Conference Paper
Issue:Volume: Artificial Material for Electromagnetic Applications      Number:      Year: 2006
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Title: Simulation and Design of Multiband Koch Fractal CPS Antennas
File Type: Conference Paper
Issue:Volume: S24 Wideband and Multiband Antenna Modeling and Applications      Number:      Year: 2018
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Title: Simulating Bondpads Using the Sonnet EM Simulator
File Type: Conference Paper
Issue:Volume: EM Simulations Using Sonnet - I      Number:      Year: 2010
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Title: Simple and Compact Dual Band-Notched Monopole Antenna Using U-Shaped Forms on the Conductor-backed Plane for UWB Applications
Abstract: A planar ultra-wideband antenna with dual band-notched characteristics is proposed. The main features of the proposed antenna are the extremely compact dimensions and band-notched characteristics that are obtained without modifying the radiator. The dual band-notched characteristics are achieved by a pair of mirror U-shaped slots and an inverted U-shaped slot at the conductorbacked plane. The measured results of the manufactured (15 mm × 15 mm) antenna on 1.6 mm FR4 substrate show that the antenna operates with VSWR less than two over the frequency band from 3 GHz to 11.2 GHz. That wideband is featured by the existence of two notched bands VSWR is more than five aimed at suppressing any interference from IEEE802.11a WLAN 5 GHz (5.15 GHz - 5.825 GHz) and ITU 8 GHz (8.025 GHz - 8.4 GHz) band. The antenna has a desirable VSWR level, radiation pattern, and gain characteristics for ultra wideband frequency band range.
Author(s): M. Moosazadeh, Z. Esmati
File Type: Journal Paper
Issue:Volume: 28      Number: 11      Year: 2013
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Title: SigrityX: Fast and Accurate PI/SI Analysis
File Type: Conference Paper
Issue:Volume: S23 Electromagnetic Modeling for Electronic Design Automation      Number:      Year: 2021
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Title: Shielding Effectiveness of Finite Width Shields Against Low-impedance Magnetic Near-field Sources
File Type: Conference Paper
Issue:Volume: S35 Low Frequency Computational Electromagnetics I      Number:      Year: 2018
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Title: Shaped-Beam Circularly-Polarized Practical Antenna Array for Land Imaging SAR Systems
Abstract: A planar array of M × N circularly polarized microstrip patch antennas is proposed for high resolution land-imaging applications using an airborne side-looking Synthetic Aperture Radar (SAR) systems. The microstrip patch is designed to produce either right-hand or lefthand circular polarization. The planar array is designed to produce a circularly polarized three-dimensional beam of cosecant-squared shape in the range direction and uniform shape in the azimuth direction. The mutual coupling between the adjacent patches in the proposed array is studied for the assessment of the final array design and is shown to have no bad effects on the resulting beam shape or the array performance. A computationally efficient Particle Swarm Optimization (PSO) algorithm is developed and applied to find the amplitude and phase distributions of the feeding voltages over the planar array elements required to produce the desired radiation patterns. This technique is achieved by developing a fast algorithm to extend the amplitudes and phases calculated for M-element and N-element linear arrays to be applied to the elements of a two-dimensional M × N planar array without the need to apply the PSO to calculate the amplitudes and phases for the entire elements of the planar array. A perfect three-dimensional pattern with the desired shapes in both azimuth and range directions is achieved. The input impedance, the axial ratio and the shapes of the radiation patterns produced by the proposed antenna array are investigated and shown to be satisfactory over the frequency band of 3.91 − 4.11 GHz.
Author(s): M. A. El-Hassan, K. F. A. Hussein, A. E. Farahat, K. H. Awadalla
File Type: Journal Paper
Issue:Volume: 34      Number: 5      Year: 2019
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Title: Sensor Selection via Convex Optimization in Remote Contact-free Measurement of Currents
File Type: Conference Paper
Issue:Volume: S38 Low-Frequency Electromagnetic Inverse Problems I      Number:      Year: 2017
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Title: Self-Inductance of an Extrusion of a Planar Curve
File Type: Conference Paper
Issue:Volume: S11 Modeling and Applications – II      Number:      Year: 2020
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Title: Selection of New Features in the Electromagnetic Solution Kernel of FEKO Suite 6.0
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using FEKO      Number:      Year: 2011
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Title: SAR Induced by Low and High Directivity Antenna Apertures at Distances Greater than 25 mm from the Body
Abstract: A comprehensive SAR study of low and high directivity antennas operated at distances greater than 25 mm but less than 200 mm from a large homogeneous elliptical phantom is presented. The study considers antennas, such as dipoles, monopoles, planar inverted-F antennas (PIFAs), IFAs, patches, patch arrays, and dipole arrays. SAR estimation methods for low directivity antennas for both near and far field conditions are proposed and elucidated. For directive antennas and arrays radiating directly towards the phantom interesting phenomena are observed that require more detailed investigation
Author(s): A. B. Mazady, G. Schmid, R. Uberbacher, M. Ali
File Type: Journal Paper
Issue:Volume: 30      Number: 9      Year: 2015
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Title: SAR and Diversity Performance of Wireless Handheld Devices with Dual Antennas
File Type: Conference Paper
Issue:Volume: Modeling of Biomedical Problems - 2      Number:      Year: 2007
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Title: S-Slot Dual-Fed Tri-Band Square Patch Antenna
File Type: Conference Paper
Issue:Volume: Student Projects in Sonnet      Number:      Year: 2013
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Title: S-Slot Dual-Fed Tri-Band Square Patch Antenna
File Type: Conference Paper
Issue:Volume: Student Projects in Sonnet      Number:      Year: 2013
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Title: S-parameter Sensitivity Analysis of Planar Antennas using Self-adjoint Approach with the Method of Moments
File Type: Conference Paper
Issue:Volume: Electromagnetic-Simulation-Driven-Design: Modeling and Optimization      Number:      Year: 2011
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Title: Rotman Lens Amplitude, Phase, and Pattern Evaluations by Measurements and Full Wave Simulations
Abstract: Microwave lens’ performance is depicted by several parameters such as phase error, amplitude taper, and array scan pattern etc. For decades, these parameters have been estimated by the geometry optics method that does not capture the mutual couplings within the lens geometry. Full wave simulation toolkits to conduct EM prediction are now available. However, using them to synthesize and optimize the electrical performance of Rotman lens is still relatively new. Several microwave lens full wave simulations have been attempted using different methods, such as FDTD, FEM, and FIT. They were reported from the perspectives of either phase or amplitude predictions at a single port or single frequency. However, the lens properties at multiple frequencies and for multiple beam ports using MoM have not been investigated. In this paper, we address such simulations using the planar Green’s function in FEKO. The phase, amplitude and array factor across the frequency band for multiple beam ports are compared with the measured results, and their errors are evaluated. Prominent agreement between FEKO and measurement is demonstrated. The performance of a prototype lens is presented, followed by discussing few future aspects of lens optimization using full wave simulations.
Author(s): J. Dong, A. I. Zaghloul, R. Sun, C. J. Reddy, S. J. Weiss
File Type: Journal Paper
Issue:Volume: 24      Number: 6      Year: 2009
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Title: Roof Shaped Rectangular Slotted Patch Antenna at 18.3 GHz
File Type: Conference Paper
Issue:Volume: S57 Design Simulation and Build Microwave Devices using Sonnet Suites      Number:      Year: 2018
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Title: Role of Surface Geometric Patterns and Parameters in the Dispersion Relations of Spoof Surface Plasmon Polaritons at Microwave Frequency
Abstract: Spoof surface plasmon polaritons (SSPPs) can be excited using geometric shapes on conducting surfaces in microwave (MW) regime. They are eminent as compared to the conventional microstrip (MS) transmission lines, due to their better efficiency and compactness in high density and high-speed circuitry. In this work, we compare normalized dispersion curves (DCs) of different groove shapes engineered on the planar metallic strip with the variation of geometric parameters of the structure, which are obtained by Eigen-mode solver of ANSYS’s HFSS. It is found the dispersion characteristics are determined by the shape and the asymptotic frequency can finely be tuned through the geometric parameters. All DCs deviate further from the light line indicating slow propagation of SSPPS. The performance of rectangular grooves is clearly outstanding; however, the circular grooves behave comparably better than Vee-groove. Further, a low pass plasmonic filter has been proposed with semicircular gradient subwavelength grooves designed on a planar metallic strip with transition sections to match both the impedance and momentum of MS line and the plasmonic waveguide. Results of S-parameters and magnitude of electric field distributions show excellent transmission efficiency from fast guided wave to slow SSPPs. It is also observed that the confinement of such surface waves is dependent on the geometric parameters which can be useful in plasmonic structure engineering and fine-tuning the cutoff frequencies, hence posing a new prospect for advanced plasmonic integrated devices and circuits.
Author(s): R. S. Anwar, L. Mao, H. Ning
File Type: Journal Paper
Issue:Volume: 34      Number: 1      Year: 2019
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Title: Roger Harrington and Shielded Planar Microwave Electromagnetic Analysis
File Type: Conference Paper
Issue:Volume: S36 Celebrating 50th Anniversary of Field Computation by Moment Methods      Number:      Year: 2018
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Title: Robust Numerical Modeling of Currents Radiating in Non-Birefringent Anisotropic Medium Layers
File Type: Conference Paper
Issue:Volume: S09 Integral Equation Methods and Applications I      Number:      Year: 2016
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Title: Robust Numerical Modeling of Currents Radiating in Non-Birefringent Anisotropic Medium Layers
File Type: Conference Paper
Issue:Volume: S11 Student Paper Competition I      Number:      Year: 2016
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Title: Robust Feed Modeling of the Asymmetric Planar Mesh Dipole-Type Antenna
Abstract: This paper explores the feed method for the asymmetric planar XY-mesh dipole-type antenna and the modifications needed to prevent its exploitation by automated genetic algorithm (GA) optimization for the application of RFID tag antennas, where the antenna is optimized to the conjugate of the chip impedance. By removing certain feed parameters from the GA optimization and instead making them wavelength dependent, the goal of creating robust models which achieve accurate and matching results between various electromagnetic (EM) simulators, with a focus on the WIPL-D and Axiem EM simulators, was achieved.
Author(s): J. Rayno, D. S. Linden
File Type: Journal Paper
Issue:Volume: 34      Number: 2      Year: 2019
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Title: Robust Feed Modeling of the Asymmetric Planar Mesh Dipole-Type Antenna
File Type: Conference Paper
Issue:Volume: S37 Advances in Electromagnetic Modeling by WIPL-D I      Number:      Year: 2018
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Title: Robust Cubature Methodology for Spectral Integrals
File Type: Conference Paper
Issue:Volume: S20 Advanced Computational Techniques in Electromagnetics      Number:      Year: 2015
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Title: Reliable Design Optimization of FEKO-Simulated Microwave Structures Using Manifold Mapping
File Type: Conference Paper
Issue:Volume: EM Applications using FEKO II      Number:      Year: 2012
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Title: Reflection compensation scheme for the efficient and accurate computation of waveguide discontinuities in photonic crystals
Abstract: Abstract—We presented a novel method for the accurate and efficient computation of the reflection and transmission coefficients of waveguide discontinuities within planar photonic crystals (PhCs). This method proposes a novel kind of field source that optimally excites the dominant waveguide mode and mimics procedures that are typically used for the measurement of reflection coefficients. This technique may be applied to arbitrary field simulators working in the frequency domain. The presented reflection compensation scheme is elucidated along the Method of Auxiliary Sources (MAS). In order to verify the results, we compare two test cases with the rigorous connection technique provided by the Multiple Multipole Method (MMP).
Author(s): D. Karkashadze, R. Zaridze , A. Bijamov, D. Karkashadze, R. Zaridze , A. Bijamov
File Type: Journal Paper
Issue:Volume: 19      Number: 1      Year: 2004
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Title: Reflectarray And Space Fed Microstrip Antenna Arrays
File Type: Conference Paper
Issue:Volume: Analysis and Design of Reflectarrays      Number:      Year: 2010
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Title: Reduction of Singular Surface Integrals of Tensor Green Function to Non-Singular Line Integrals in Integral Equations for Planar Geometries
File Type: Conference Paper
Issue:Volume: S26 Integral Equation Methods and Applications IV      Number:      Year: 2016
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Title: Reducing Power Coupling Loss between Laser Diodes and Planar Optical Waveguides by Using Tapers
File Type: Conference Paper
Issue:Volume: Guided Waves in Non-Standard Media      Number:      Year: 2008
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Title: Reconstruction of the Antenna Far-Field Pattern through a Fast Plane-Polar Scanning
Abstract: This paper provides the experimental validation of a fast and accurate technique, which allows the reconstruction of the antenna radiation pattern from a minimum number of near-field measurements collected through a plane-polar scanning. This near-field to far-field (NFTFF) transformation technique relies on a nonredundant sampling representation of the voltage acquired by the probe, achieved by modeling the antenna with a double bowl, a very flexible model particularly suitable to deal with antennas having a quasi-planar geometry. The NF data required by the standard plane-rectangular NFTFF transformation are efficiently reconstructed from the nonredundant plane-polar ones by using an optimal sampling interpolation algorithm, thus making possible to get a considerable measurement time saving. The accuracy and practical efficacy of the described technique are assessed by experimental tests carried out at the Antenna Characterization Lab of the University of Salerno.
Author(s): F. D'Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi
File Type: Journal Paper
Issue:Volume: 31      Number: 12      Year: 2016
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Title: Reconfigurable Planar Monopole Antenna for Fifth-Generation Mobile Communication System
Abstract: A frequency reconfigurable planar monopole antenna for fifth-generation (5G) mobile communication terminal equipment is presented. The proposed antenna uses a meandered monopole, branch resonance and other techniques to make the antenna resonant in multiple frequency bands. The antenna is compact in size (115 mm × 55 mm × 0.8 mm) and has a longitudinal length less than one-tenth of the resonant wavelength (working at 1.79 GHz). The pin diode is designed between the planar meandered monopole antenna and branch. The current path of the highfrequency current on the antenna can be easily controlled by controlling the DC bias voltage of the diode, and the operating frequency of the antenna is switched between three frequency bands. The antenna is fed directly through a 50 Ω matched transmission line. The measured data of the antenna in the anechoic chamber show good consistency with simulation data. The radiation pattern of the antenna shows good omnidirectional characteristics and good frequency characteristics, with a maximum radiation gain of 13.6 dBi. Experimental results demonstrate that the antenna can meet the design requirements of 5G communication.
Author(s): P. Chen, L. Wang, Z. Ma
File Type: Journal Paper
Issue:Volume: 36      Number: 1      Year: 2021
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Title: Reconfigurable 2×1 CPW-Fed Rectangular Slot Antenna Array (RSAA) Based on Graphene for Wireless Communications
Abstract: This article presents a 2×1 CPW ultra wideband rectangular slot antenna array (UWB-RSAA) with a modified circular slot shape to support a high data rate for wireless communications applications. The proposed antenna array dimensions are 0.7λo×0.8λo×0.064λo at the resonant frequency 1.8 GHz. It is fabricated on Rogers RO4003 substrate and fed by using a coplanar waveguide (CPW). A graphene layer is added on one side of the substrate to realize frequency reconfigurability and improve the array gain. The proposed array acquires -10 dB impedance bandwidth of the RSAA that extends from 1.7 GHz to 2.6 GHz, from 3.2 to 3.8 GHz, and from 5.2 GHz to 7 GHz. The proposed array achieved a realized peak gain of 7.5 dBi at 6.5 GHz at 0 Volt bias with an average gain of 4.5 dBi over the operating band. When the graphene bias is increased to 20 Volt, the antenna bandwidth extends from 1 GHz to 4 GHz and from 5 to 7 GHz with a peak gain of 14 dBi at 3.5 GHz and an average gain of 7.5 dBi. The linearly polarized operation of the proposed array over the operating bands makes it suitable for short-range wireless communications .
Author(s): D. M. Elsheakh, O. M. Dardeer
File Type: Journal Paper
Issue:Volume: 36      Number: 6      Year: 2021
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Title: Realization of High-gain Circularly Polarized Planar Lens Antenna with Beam Steering Capability
File Type: Conference Paper
Issue:Volume: 3-MA-6 Metamaterial based Antennas and Broadband Antennas      Number:      Year: 2018
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Title: Rapid Prototyping of Nanoslit Lenses
File Type: Conference Paper
Issue:Volume: Advances in CEM Applications I      Number:      Year: 2012
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Title: Radiation Pattern Synthesis and Mutual Coupling Compensation in Spherical Conformal Array Antennas
Abstract: This paper presents a novel technique based on Hybrid Spatial Distance Reduction Algorithm (HSDRA), to compensate the effects of deformity and mutual coupling occurred due to surface change in conformal arrays. This antenna surface deformation shifts the position of null points and loss of the main beam resulting in reduced antenna gain along with substantial undesirable effects on the antenna performance. The proposed algorithm, which cumulatively incorporates the Linearly Constraint Least Square Optimization (LCLSO) and Quadratically Constraint Least Square Optimization (QCLSO) techniques, is formulated to minimize/reduce the absolute distance between the actual (simulated/measured) radiation pattern and the desired radiation pattern while keeping the direction of mainbeam and nulls position under control. In particular, a 4x4 conformal microstrip phased array from planar surface is deformed to prescribe spherical-shape surface with various radii of curvature, is validated. For the enhancement of Gain of the conformal array antenna, Gain Maximization Algorithm is also proposed, the simulated results of which is compared to the traditional Phase compensation technique and unconstraint least squares optimization. The analytical results for both planar and spherical deformed configurations are first evaluated in MATLAB and then validated through Computer Simulation Technology (CST).
Author(s): T. A. Khan, M. I. Khattak, A. Tariq
File Type: Journal Paper
Issue:Volume: 36      Number: 6      Year: 2021
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Title: Radiation Pattern of a Networks Antenna Supplied with Butler Matrix, Comparison with a Multi-layer Structure
File Type: Conference Paper
Issue:Volume: Analysis and Design of Antennas for Wireless Communications      Number:      Year: 2007
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Title: Radiation From A Large Circular Loop Around A Dielectric Coated Conducting Sphere
File Type: Conference Paper
Issue:Volume: Poster Session      Number:      Year: 2006
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Title: Quad-Band Lamp-Shaped Antenna at 43 Ghz
File Type: Conference Paper
Issue:Volume: Student Projects in Sonnet      Number:      Year: 2013
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Title: Proximity Effect of UWB U-Slot Patch Antenna on Human Body
File Type: Conference Paper
Issue:Volume: S33 Antenna Systems and Applications      Number:      Year: 2019
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Title: Printed Cross-Slot Wideband Conformal Antenna for GPS Application
Abstract: A novel cross-slot printed wideband conformal antenna is proposed for GPS application. Initially a planar antenna with cross-slot is designed at a slightly higher frequency and then the planar antenna is transformed to the corresponding cylindrical conformal antenna with the desired radius of curvature. The combination of partial ground plane and cross-slot on patch are used for bandwidth enhancement. The proposed conformal antenna exhibits a fractional bandwidth (for the definition of -10dB) of 79.28% operating from 1091 to 2524 MHz, which is suitable for all GPS bands, GLONASS and GALILEO applications. The radiation pattern exhibits an omnidirectional pattern and gain of proposed conformal antenna is 2.37 to 5.33dBi within operating frequency range.
Author(s): R. Sahoo, D. Vakula, N. Sarma
File Type: Journal Paper
Issue:Volume: 33      Number: 10      Year: 2018
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Title: Preconditioned GIFFT: A Fast MoM Solver for Large Arrays of Printed Antennas
Abstract: Abstract— A new type of fast method of moments (MoM) solution scheme using standard basis functions for large arrays with arbitrary contours and/or missing elements is applied to array antennas in a layered configuration. The efficiency of the method relies on use of the FFT along with approximating the Green’s function as a separable sum of interpolation functions defined on a relatively sparse, uniform grid. The method is ideally suited for solving array problems, and its effectiveness is demonstrated here for planar arrays of printed antennas. Both fill and solve times, as well as memory requirements, are dramatically improved with respect to standard MoM solvers.
Author(s): B. J. Fasenfest, F. Capolino, D. R. Wilton, B. J. Fasenfest, F. Capolino, D. R. Wilton
File Type: Journal Paper
Issue:Volume: 21      Number: 3      Year: 2006
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Title: Practical CEMist "Current Vector Alignment and Lowered Resoance in Small Planar HF Wire Antenna Designs
File Type: Newsletter Paper
Issue:Volume: 20      Number: 1      Year: 2005
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Title: Powering Sensors in IoT System by Using Compact Seven Band PIFA Rectenna
Abstract: A compact seven band coplanar waveguide fed planar inverted F antenna (PIFA) is presented. The proposed antenna is designed to harvest the ambient radio frequency energy at GSM 900, GSM 1800, LTE band 11 and 7, UMTS 2100, Wi-Fi 2.4, LTE and WIMAX 5.2. The antenna is simulated using 3D electromagnetic simulators CST and HFSS. Moreover, the antenna is fabricated and it is used to measure the indoor RF spectrum in Egypt. A simple AC to DC converter unit is designed by using HSMS 2850 Schottky diode to convert the collected RF energy to DC energy. The antenna and the AC to DC converter are integrated to form the RF energy harvesting system. The maximum measured efficiency obtained at 2.4 GHz is about 63.7%.
Author(s): N. A. Eltresy, D. M. Elsheakh, E. A. Abdallah, H. M. Elhennawy
File Type: Journal Paper
Issue:Volume: 33      Number: 12      Year: 2018
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Title: Planar Ultra-Wideband (UWB) Antenna with C-Band Rejection Using Self-Complementary Structures
Abstract: In this paper, we describe an application of the Self-Complementary Structures (SCS) to design a low-profile UWB monopole antenna with band-notched function. The proposed antenna consists of a square radiating patch with a rotated Z-shaped slot, a ground plane with a rectangular slot and rotated Z-shaped parasitic structure inside slot; which provides a wide usable fractional bandwidth of more than 125% (2.81- 12.63 GHz), with band-notched function around 3.7-4.2 GHz, to avoid interference from C-band communications. In the presented antenna, by using a rotated Z-shaped parasitic structure inside the rectangular slot in the ground plane, additional resonances are excited and hence much wider impedance bandwidth can be produced; especially at the higher band. To generate a band-stop characteristic, we use the self-complementary structure of the configuration that was inserted in the ground plane, which is a rotated Z-shaped slot at square radiating patch; with this design we can give a C-band rejection performance. The designed antenna has a small dimension of 12×18×0.8 mm3 .
Author(s): N. Ojaroudi, N. Ghadimi, Y. Ojaroudi
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
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Title: Planar Two-Arm Spiral Antenna Fed by Microstrip Line
File Type: Conference Paper
Issue:Volume: 4-P4-B Antennas      Number:      Year: 2017
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Title: Planar Terahertz Antenna Optimisation
File Type: Conference Paper
Issue:Volume: Special Session: Recent Electromagnetics & Antennas Activities in the European Network "ACE"      Number:      Year: 2005
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Title: Planar Model of RF MEMS Shunt-Capacitive Switches
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling      Number:      Year: 2004
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Title: Planar Microstrip Tri-Mode Bandpass Filter Using Center-Stub-Loaded Spiral Resonator
File Type: Conference Paper
Issue:Volume: S65 Advanced RF and Microwave I      Number:      Year: 2016
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Title: Planar Metamaterial for Matched Waveguide Termination
Abstract: We present the design, fabrication, and characterization of a novel matched waveguide termination based on planar artificial metamaterial. This matched termination is realized by recent developed planar metamaterial absorber, which can be designed to near-completely absorb the propagating electromagnetic energy at the edge of a shorted rectangular waveguide. Theoretical discussions, numerical simulations and microwave experiments are employed to illustrate the matched characteristics of the proposed waveguide termination. As an example, a matched waveguide termination with standing wave ratio of 1.23 is experimentally demonstrated at microwave frequency. Our result yields a promising approach to design of novel waveguide terminations by techniques of metamaterials.
Author(s): J. Li, F. Wang, G. Wen, Y. Huang, W. Zhu
File Type: Journal Paper
Issue:Volume: 28      Number: 12      Year: 2013
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Title: Planar Lens Antenna Based on Low-pass Frequency Selective Surfaces
File Type: Conference Paper
Issue:Volume: 4-4-B Antenna Design and Optimization Techniques II      Number:      Year: 2017
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Title: Planar Dual-Band WLAN MIMO Antenna with High Isolation
Abstract: In this paper, a dual-band multiple-input multiple-output (MIMO) antenna with a planar and rotational symmetric structure is presented. The proposed antenna comprises two via-fed monopole antennas arranged orthogonally in cross-pairs. When each monopole is excited, the other can be employed as a parasitic element. By properly adjusting the antenna dimensions, two resonant modes can be generated at about 2.45 and 5.6 GHz. Besides, the radiation patterns of two monopoles are orthogonal to each other, resulting in good pattern diversity and high isolation without using additional decoupling methods. Measured results show that two operating bands ranging from 2.3-2.75 and 5.09-6.16 GHz are obtained, which can cover the whole (2.4/5.2/5.8-GHz) wireless local area network (WLAN) bands. Port-to-port isolation is more than 24 and 22 dB at the lower and higher operating bands, respectively. Envelope correlation coefficient is studied as well.
Author(s): H. Li, L. Kang, Y. Xu, Y.-Z. Yin
File Type: Journal Paper
Issue:Volume: 31      Number: 12      Year: 2016
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Title: Planar Compact U-Shaped Patch Antenna with High-Gain Operation for Wi-Fi/WiMAX Application
Abstract: A planar inverted U-shaped patch antenna with high-gain operation applied for WLAN/WiMAX access point or base station has been proposed and investigated. It provides relatively wider impedance bandwidth of 180 MHz covering the operating bandwidth for WLAN/WiMAX system. The proposed planar patch antenna also provides the directional radiation patterns with maximum antenna peak gain and efficiency of 8.0 dBi and 80% across the operating band, respectively. Only with the antenna size of 44 × 35 × 4.0 mm3, the proposed patch antenna has the compact operation with more than 13% antenna size reduction.
Author(s): J. Lu, H. Chin
File Type: Journal Paper
Issue:Volume: 26      Number: 1      Year: 2011
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Title: Planar Circular Monopole Antenna with Perforated Dielectric Resonator for Notched Ultra-Wide Band Applications
Abstract: In this paper, a planar circular patch antenna is presented for UWB operating characteristics. The bandwidth of the proposed antenna is increased by inserting a perforated dielectric resonator (DR) material with the planar monopole. The design combines the advantages of a small size dielectric resonator (DR) and thin planar monopole antennas. Two antenna designs A and B are proposed. In design A, two layers of the same dielectric material are presented with the same radius and different thicknesses. While in antenna design B, only one dielectric material layer perforated by 11 holes drilled with the same radius is considered. The effects with respect to the geometric parameters of the proposed antennas on impedance bandwidth and radiation pattern are discussed. In addition, the two proposed antennas are designed to have a rejection frequency band from 5 to 6 GHz by inserting two U-shaped slots in the ground plane, where the WLAN service is allocated. The proposed antennas are completely designed and analyzed using the finite element method (FEM), and then the finite integral transform (FIT) technique is used to check the validity of the numerical results.
Author(s): S. H. Zainud-Deen, A. Shaker, K. R. Mahmoud
File Type: Journal Paper
Issue:Volume: 27      Number: 6      Year: 2012
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Title: Planar Balanced-to-Unbalanced Power Divider
File Type: Conference Paper
Issue:Volume: 2-2-D Advanced Design of Multifunctional Microwave Passive Circuits      Number:      Year: 2017
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Title: Phase-only Synthesis Algorithm for Transmitarrays and Dielectric Lenses
Abstract: In this work a phase-only synthesis algorithm is applied for the design of lens-array antennas yielding a desired radiation pattern. The potential relevance of spillover effect on the lens radiation pattern is illustrated, making it necessary to include it in the lens model and to take it into account in the synthesis algorithm. Thus, both the contribution of the lens and the spillover radiation are jointly modeled as a planar array. Moreover, in order to validate the algorithm, it has been applied to the synthesis of pixelated dielectric lenses, which have been simulated using a commercial software. Simulations show good agreement with the algorithm results, validating its use for this type of lenses.
Author(s): S. Loredo, G. Leon, O. F. Robledo, E. G. Plaza
File Type: Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
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Title: Perturbed E-Shaped Patch Antenna for Wireless Applications
File Type: Conference Paper
Issue:Volume: Student Projects in Sonnet      Number:      Year: 2013
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Title: Perspective of the Uniaxial Wavelet-transformed FDTD Scheme
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2012
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Title: Perspective of the Uniaxial Wavelet-transformed FDTD Scheme
File Type: Conference Paper
Issue:Volume: Advanced Computational Techniques in Electromagnetics - 1      Number:      Year: 2007
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Title: Performance of Multiple-Feed Metasurface Antennas with Different Numbers of Patch Cells and Different Substrate Thicknesses
Abstract: The design and performance of low-profile, multiple-feed metasurface antennas with different numbers of patch cells and different substrate thicknesses at a terahertz frequency are presented in this paper. The utilized antenna designs consist of a periodic array (N × M) metallic square-patch metasurface and a planar feeding structure, which are both patterned on an electrically thin, high-permittivity GaAs substrate. The antenna gain increased in a linear fashion with an increasing number of patch cells, which were directly fed by the slit feedline. A 3-dB gain increment was observed irrespective of the substrate thickness when the number of patch cells was doubled. However, the 3-dB gain bandwidth as well as the radiation efficiency changed significantly with varying substrate thicknesses. The described antenna structure offers useful characteristics by means of a combination of different substrate thicknesses and patch numbers. In addition, the proposed antenna design features a number of benefits, including a low profile, mechanical robustness, easy integration into circuit boards, and excellent suitability for low-cost mass production.
Author(s): N. Hussain, I. Park
File Type: Journal Paper
Issue:Volume: 33      Number: 1      Year: 2018
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Title: Performance of Multiple-Feed Metasurface Antennas with Different Numbers of Patch Cells and Different Substrate Thicknesses
Abstract: The design and performance of low-profile, multiple-feed metasurface antennas with different numbers of patch cells and different substrate thicknesses at a terahertz frequency are presented in this paper. The utilized antenna designs consist of a periodic array (N × M) metallic square-patch metasurface and a planar feeding structure, which are both patterned on an electrically thin, high-permittivity GaAs substrate. The antenna gain increased in a linear fashion with an increasing number of patch cells, which were directly fed by the slit feedline. A 3-dB gain increment was observed irrespective of the substrate thickness when the number of patch cells was doubled. However, the 3-dB gain bandwidth as well as the radiation efficiency changed significantly with varying substrate thicknesses. The described antenna structure offers useful characteristics by means of a combination of different substrate thicknesses and patch numbers. In addition, the proposed antenna design features a number of benefits, including a low profile, mechanical robustness, easy integration into circuit boards, and excellent suitability for low-cost mass production.
Author(s): N. Hussain, I. Park
File Type: Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
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Title: Performance of MATLAB and Python for Computational Electromagnetic Problems
Abstract: MATLAB and Python are two common programming languages commonly used in computational electromagnetics. Both provide simple syntax and debugging tools to make even complicated tasks relatively simple. This paper studies how these programming languages compare in throughput for a variety of tasks when utilizing complex numbers which are common in electromagnetics applications. The compared tasks include basic operations like addition, subtraction, multiplication, and division, along with more complex operations like exponentiation, summation, Fourier transforms, and matrix solving. Each of these tests is performed for both single and double precision on the CPU. A 2D finite difference frequency domain problem and a planar array beamforming problem are also presented for comparison of throughput for realistic simulations.
Author(s): A. J. Weiss, A. Z. Elsherbeni
File Type: Journal Paper
Issue:Volume: 35      Number: 7      Year: 2020
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Title: Patch Antenna with L-Shaped Radiators
File Type: Conference Paper
Issue:Volume: Student Microwave Design Projects with Sonnet      Number:      Year: 2011
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Title: Parametric Model Generation Algorithm for Planar Microwave Structures based on Full–Wave analysis and Design of Experiment
File Type: Conference Paper
Issue:Volume: Time Domain Numerical Modeling Beyond FDTD      Number:      Year: 2003
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Title: Parameters Update Integration in EM Analysis of ATL and PTL in the FDM
File Type: Conference Paper
Issue:Volume: Advanced Transmission Lines Modeling, Macromodeling and Signal Integrity      Number:      Year: 2008
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Title: Parameter Identification of the Planar Integrated EMI Filter Based on the Improved Immune Algorithm
Abstract: The planar integrated EMI filter has been widely used because of its small size and good highfrequency characteristics. During the production process, if the electrical parameters of the integrated LC structure can be accurately identified, it will help improve the high-frequency characteristics of the filter. However, this identification problem is a multi-peak problem, which can easily fall into a local optimal solution. Based on the Feature Selective Validation method, this paper proposes an improved Immune Algorithm. The proposed method keeps changing the fitness function in the iterative process to avoid the algorithm falling into the local optimal solution. Finally, comparing with the measured impedance characteristic curve, it is verified that the proposed method is more accurate than the common Immune Algorithm.
Author(s): J. Bai, H. Zhao, Y. Liu, K. Guo
File Type: Journal Paper
Issue:Volume: 36      Number: 1      Year: 2021
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Title: Parallel SAI Preconditioned Adaptive Integral Method For Analysis of Large Planar Microstrip Antennas
Abstract: An efficient parallel sparse approximate inverse (PSAI) preconditioning of the adaptive integral method (AIM) is proposed to analyze the large-scale planar microstrip antennas. The PSAI preconditioner is based on the parallelized Frobenius-norm minimization, and is used to speed up the convergence rate of the loose generalized minimal residual method (LGMRES) iterative solver. The parallel AIM is used to accelerate the required matrix vector product operations. Numerical results demonstrate that the PSAI preconditioner is effective with the AIM and can increase the parallel efficiency significantly when analyzing the large planar microstrip antennas.
Author(s): M. Li, M. Chen, W. Zhuang, Z. Fan, R. Chen
File Type: Journal Paper
Issue:Volume: 25      Number: 11      Year: 2010
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Title: Palladium Decorated SWCNTs Sensor for Detecting Methane at Room Temperature Based on UWB-RFID
Abstract: A chipless sensor in the protocol of ultra wideband radio frequency identification (UWB-RFID) is proposed in the paper. This sensor, used to detect methane at room temperature, is configured by a planar patch antenna plus a U slot on which interdigitated fingers electrodes (IDE) with load of palladium decorated single walled carbon nanotubes (Pd-SWCNTs) are embedded. The sensor can cover the entire UWB spectrum except for the band that produce band-gap. The amplitudes and frequencies of the band-gap are designated as the signatures modulated and reflecting the status quo of methane retrieved by Pd-SWCNTs. The sensor is validated by an approximate combination of the analytical and numerical method. Results show that if the concentration of methane is increased from 0 ppm to 100 ppm at room temperature, the identifiable sensitivity can be achieved by -9.32 dB in terms of the scheme of the amplitude modulation of band-gap frequency; or, the identifiable sensitivity can be achieved by -11.30 dB in terms of the scheme of the frequency modulation of band-gap frequency.
Author(s): J. Liu, P. B. Li
File Type: Journal Paper
Issue:Volume: 31      Number: 8      Year: 2016
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Title: Orthogonally Integrated Hybrid Antenna for Intelligent Transportation Systems
Abstract: The aim of this paper is to design an orthogonally integrated hybrid antenna to address 5G/Wi-Fi/C-V2X communication simultaneously in one device. The proposed antenna consists of three planar monopoles and a defected ground plane with a dimension of 55x30x1.2mm3. High Frequency Structure Simulator (HFSS) is employed to design the proposed antenna, which resonates at three distinct frequencies 2.45 GHz (Wi-Fi), 3.5 GHz (5G), and 5.9 GHz. Further, the prototype antenna is fabricated and experimentally validated in comparing with simulation results. The excellent agreement among the simulation and measured results shows that the designed antenna operates simultaneously at 5G/Wi-Fi/C-V2X frequency bands and the isolation effects between the elements is less than 15dB.
Author(s): S. Syedyusuff, R. Subramaniam, R. Vijay
File Type: Journal Paper
Issue:Volume: 36      Number: 5      Year: 2021
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Title: Optimum Plannar Antenna Design Based on an Integration of IE3D Commercial Code and Optimization Algorithms
Abstract: The optimum planar antenna design utilizing a simulation tool based an integration of IE3D commercial code as an electromagnetic computational engine and an add-on optimization algorithm is proposed in this paper. The work is motivated by the popularity of planar antennas and the need of customized designs in industrial applications, which can be effectively achieved by using simulation tools. Currently available commercial codes are reliable and relatively accurate in the analysis with more efforts tending to enhance the efficiency. The quality of the antenna design will mainly rely on an effective optimization algorithm that can be and should be developed independently according to engineers’ own need since the variables and cost functions for optimization can be flexibly selected. The integration of existing analysis codes, as mentioned above, and self-developed algorithms will be most effective for an engineer in the customized antenna design. The concepts and strategies are addressed with numerical examples to validate.
Author(s): Hsi-Tseng Chou, Yuan-Chang Hou, Wen-Jiao Liao, Hsi-Tseng Chou, Yuan-Chang Hou, Wen-Jiao Liao
File Type: Journal Paper
Issue:Volume: 22      Number: 3      Year: 2007
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Title: OPTIMIZING PLANAR SOURCE DISTRIBUTIONS FOR DEEP POWER DEPOSITION IN BIOLOGICAL TISSUE
Abstract: In non-invasive hyperthermia, penetration depth in high water content biological tissue can be increased up to 3 times using a focused instead of uniform surface electric field distribution. The focusing involves maximizing the field integral at a focal point by solving for the surface phase function which makes the integrand real and positive for all surface points. The resulting non-linear differential equation is solved in using a series approximation. A focused power deposition pattern is presented using this ideal planar distribution which is the theoretical optimum for high resolution hyperthermia cancer treatment. [Vol. 7, No. 2, pp. 97- 109 (1992), Special Issue on Bioelectromagnetic Computations]
Author(s): Carey M. Rappaport, Carey M. Rappaport
File Type: Journal Paper
Issue:Volume: 7      Number: 2      Year: 1992
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Title: Optimization of the Shape of Non-Planar Electronically Scanned Arrays for IFF Applications via Multi-Objective Invasive Weed Optimization Algorithm
Abstract: The identify friend or foe antenna is a complement to many radar antennas which allows the discrimination between friendly and hostile targets by receiving identification data. Such antenna must synthesize both a sum and a difference pattern in azimuth to allow target discrimination and must point to the target being inquired, either by mechanical or electronic scanning in azimuth. In this paper, to attain optimal electronic scanning, an array of antennas lying on a generic planar curve is considered. A multi-objective optimization based on the invasive weed optimization algorithm is then applied to the shape of such curve, aimed at maximizing performances. Whereas a conventional linear array of 6 elements can effectively scan ±30°, with respect to broadside, the proposed array, notwithstanding the same number of elements and overall length, can scan ±45° and still synthesize effective sum and difference patterns.
Author(s): S. Maddio, G. Pelosi, M. Righini, S. Selleri, I. Vecchi
File Type: Journal Paper
Issue:Volume: 35      Number: 5      Year: 2020
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Title: Optimization of Miniature Inverted-F Antenna for Biomedical Applications
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2014
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Title: Optimization of Miniature Inverted-F Antenna for Biomedical Applications
File Type: Conference Paper
Issue:Volume: CAD Models and EM Solvers for Antenna Design Optimization      Number:      Year: 2014
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Title: Optimal Design of Elliptical Array Antenna Using Opposition Based Differential Evolution Technique
Abstract: Radiation pattern synthesis of non-uniformly excited planar arrays with the lowest relative side lobe level (SLL) is presented in this paper. Opposition based differential evolution (ODE) scheme, which represents a novel parameter optimization technique in antenna engineering is applied for the parameter optimization of the single and the multi-ring circular array (CA), hexagonal array (HA) and elliptical array (EA) of isotropic elements. To overcome the problem of premature convergence of differential evolution (DE) algorithm, ODE is designed without significantly impairing the fast converging property of DE. Two design examples are presented which illustrate the effectiveness of the ODE based method, and the optimization goal for each example is easily achieved. The design results obtained using ODE are much more improved than those of the results obtained using the state of the art evolution algorithms like particle swarm optimization (PSO), harmonic search (HS) and differential evolution (DE) methods in a statistically significant way.
Author(s): R. Bera, D. Mandal, R. Kar, S. P. Ghoshal
File Type: Journal Paper
Issue:Volume: 32      Number: 9      Year: 2017
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Title: Optimal Design of an Ultra-Wideband Antenna with the Irregular Shape on Radiator using Particle Swarm Optimization
Abstract: An ultra-wideband antenna with an irregular shape radiator for ultra-wideband applications has been designed by particle swarm optimization along with the simulator, HFSS. The proposed antenna design process is automated. Also, the better results can be obtained efficiently. The proposed antenna is fed by a coplanar waveguide line. The optimized antenna has a compact substrate size of 34.0 mm by 33.35 mm. Results show that the optimized irregular shape of the proposed antenna outperforms the antennas with uniform rectangular shapes in impedance matching. The optimized antenna can cover the spectrum of ultra-wideband (3.1 GHz - 10.6 GHz). The current distributions are investigated for describing the antenna characteristics. Moreover, the proposed UWB antenna has good characteristics of radiation, transmission, and impedance bandwidth.
Author(s): W. C. Weng
File Type: Journal Paper
Issue:Volume: 27      Number: 5      Year: 2012
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Title: Optimal Design for an Ultra-wideband Antenna Using Particle Swarm Optimization
File Type: Conference Paper
Issue:Volume: Optimization Methods for EM Applications      Number:      Year: 2012
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Title: ON THE USE OF PLANAR SCATTERING PROBLEM TECHNIQUES TO ANALYZE THIN PLANAR QUASI-MAGNETO-STATIC SHIELDING
Abstract: A metallic screen scattering technique developed for microwave and millimetre wave applications is adapted, using the principle of duality to a quasi-magnetostatic shielding problem. In the limiting case of low frequency (0.01 Hz) the results compare favourably with the static solution. Moreover, this adaptation is expanded to treat finite permeability shields. [Vol. 9, No. 2 (1994), Special Issue on The Numerical Computation of Low Frequency Electromagnetic Fields, pp 83-92]
Author(s): C.D. Hechtman, E.H. Lenzing, B.S. Perlman, C.D. Hechtman, E.H. Lenzing, B.S. Perlman
File Type: Journal Paper
Issue:Volume: 9      Number: 2      Year: 1994
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Title: On the Exploitation of Analytic Sequences for Array Interleaving
File Type: Conference Paper
Issue:Volume: Recent Advances in Array Antenna Synthesis - Emerging Methods and Novel Applications      Number:      Year: 2010
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Title: On the Dispersive Properties of Planar Spiral Antennas
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using FEKO      Number:      Year: 2011
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Title: ON THE APPLICATION OF THE SECANT METHOD TO THE SPECTRAL ITERATIVE APPROACH
Abstract: A new iterative algorithm for calculating the electromagnetic scattering from planar, periodic gratmgs and grids was developed. Results are compared with the moment method and the Spectral Iteration (S.l.T.) method. The Secant approach is used in conjunction with the Spectral Iteration Approach to achieve convergence. It is shown that the Secant approach, which does not depend on the evaluation of numerical derivatives to achieve convergence like the contraction-corrector S.l.T. method, yields good results. Finally, suggestions for applying this method to two dimensional structures are included and discussed. [Vol. 3, No. 1, pp. 103-119 (1988)]
Author(s): C. G. Christodoulou, R. J. Middelveen, J. F. Kauffman, C. G. Christodoulou, R. J. Middelveen, J. F. Kauffman
File Type: Journal Paper
Issue:Volume: 3      Number: 1      Year: 1988
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Title: Numerical Simulation Approaches for Phased Array Design
Abstract: Abstract - This paper reviews the two well-known numerical simulation techniques that are widely used in antenna modeling; the finite-difference time-domain (FDTD) and the Method of Moments (MoM). The packages FDANT (prepared in Fortran language by using FDTD) and NEC2 (public domain code for the MoM) are used to model various types of antenna arrays, their advantages/disadvantages are discussed on characteristic design examples, and they are calibrated one against the other. Also, a simple Matlab package (ANTEN_GUI) for the visualization of radiation patterns, beam forming and beam steering capabilities of user-designed planar arrays of isotropic radiators (which can be used to test the above mentioned packages and as an educational tool, in e.g., antennas and propagation lectures) is introduced1.
Author(s): L. Sevgi, L. Sevgi
File Type: Journal Paper
Issue:Volume: 21      Number: 3      Year: 2006
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Title: Numerical Analysis of Stacked Tapered Slot Antennas
File Type: Conference Paper
Issue:Volume: EM Applications using FEKO I      Number:      Year: 2012
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Title: Novel Microstrip Ultra-Wideband Bandpass Filter Using Radial-Stub-Loaded Structure
Abstract: A novel planar ultra-wideband (UWB) bandpass filter (BPF) using radial-stub-loaded resonator is proposed, where the resonator consists of three radial stubs, one located in the middle and two symmetrically at both sides. This radial-stub-loaded structure situates the first four resonant modes in the UWB passband (3.1~10.6 GHz) and makes the fifth resonant mode far away from this passband. To enhance the coupling degree, two interdigital coupled feed lines are utilized in this UWB filter. Finally, a UWB BPF with wide upper-stopband and sharp upper rejection skirt has been realized and its design steps have been also presented. The measured and full-wave simulated results of the proposed filter are in good agreement.
Author(s): X. Deng, K. D. Xu, Z. Wang, B. Yan
File Type: Express Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: Novel Microstrip Ultra-Wideband Bandpass Filter Using Radial-Stub-Loaded Structure
Abstract: A novel planar ultra-wideband (UWB) bandpass filter (BPF) using radial-stub-loaded resonator is proposed, where the resonator consists of three radial stubs, one located in the middle and two symmetrically at both sides. This radial-stub-loaded structure situates the first four resonant modes in the UWB passband (3.1~10.6 GHz) and makes the fifth resonant mode far away from this passband. To enhance the coupling degree, two interdigital coupled feed lines are utilized in this UWB filter. Finally, a UWB BPF with wide upper-stopband and sharp upper rejection skirt has been realized and its design steps have been also presented. The measured and full-wave simulated results of the proposed filter are in good agreement.
Author(s): X. Deng, K. D. Xu, Z. Wang, B. Yan
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1757 KB

Title: Novel Microstrip Ultra-Wideband Bandpass Filter Using Radial-Stub-Loaded Structure
Abstract: A novel planar ultra-wideband (UWB) bandpass filter (BPF) using radial-stub-loaded resonator is proposed, where the resonator consists of three radial stubs, one located in the middle and two symmetrically at both sides. This radial-stub-loaded structure situates the first four resonant modes in the UWB passband (3.1~10.6 GHz) and makes the fifth resonant mode far away from this passband. To enhance the coupling degree, two interdigital coupled feed lines are utilized in this UWB filter. Finally, a UWB BPF with wide upper-stopband and sharp upper rejection skirt has been realized and its design steps have been also presented. The measured and full-wave simulated results of the proposed filter are in good agreement.
Author(s): X. Deng, K. D. Xu, Z. Wang, B. Yan
File Type: Express Journal Paper
Issue:Volume: 1      Number: 1      Year: 2016
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Title: Novel High Performance Low Cost Phase Shifters Design Based on the Ferroelectric Materials Technology Using the WIPL-D Code
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling Using WIPL-D Code(I)      Number:      Year: 2004
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Title: New Basis Functions for the Electromagnetic Solution of Arbitrarily-shaped, Three Dimensional Conducting Bodies Using Method of Moments
File Type: Conference Paper
Issue:Volume: MoM and Applications      Number:      Year: 2007
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Title: Negative Index of Reflection in Planar Metamaterial Composed of Single Split-Ring Resonators
Abstract: This paper reports the negative index of refraction in planar metamaterial consisted of only a traditional single split-ring resonator (SRR), which is proved to exhibit simultaneously negative permittivity and negative permeability without the use of assistant metallic structures by retrieving the effective electromagnetic parameters. With the aid of current distributions investigation, it is demonstrated that within the left-handed band the negative permittivity is generated in a way analogous to the case of dual parallel cut-wire metamaterial, and negative permeability arises from the asymmetric second-order magnetic resonant mode.
Author(s): M. Tang, S. Xiao, D. Wang, J. Xiong, K. Chen, B. Wang
File Type: Journal Paper
Issue:Volume: 26      Number: 3      Year: 2011
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Title: Near to Far-Field Plane-Polar Transformation from Probe Positioning Error Affected Data
Abstract: In this article, two efficient approaches for the correction of known positioning errors of the measurement probe in a plane-polar near to far-field (NTFF) transformation, requiring a minimum number of NF data in the case of quasi-planar antennas, are presented and experimentally assessed. Such a NTFF transformation benefits from a non-redundant sampling representation of the voltage detected by the probe got by modeling an antenna with a quasi-planar geometry through a double bowl, a surface consisting of two circular bowls with the same aperture radius, but with lateral bends which may differ to better fit the antenna shape. The uniform samples, i.e., those at the points set by the representation, are accurately retrieved from the collected not regularly distributed ones either by applying a singular value decomposition based approach or an iterative scheme. Then, the input NF data necessary for the classical plane-rectangular NTFF transformation are evaluated from the so retrieved non-redundant uniform samples through a 2-D optimal sampling interpolation formula.
Author(s): F. D’Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, M. Migliozzi
File Type: Journal Paper
Issue:Volume: 33      Number: 4      Year: 2018
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Title: NEAR FIELDS OF A LOGAEPERIODIC DIPOLE ANTENNA: NEC MODELLING AND COMPARISON WITH MEASUREMENTS
Abstract: Experiences of modelling a log-periodic antenna (tapered transmission line type) using NEC are reported. The antenna is required as a component of a near-field EMC test range, and hence computation of the near fields was the primary objective although some discussion of impedance is presented. Measurements of the near field of the real antenna were undertaken on a planar measurement range having the ability to scan planes at varying distances from the antenna. The measurements show good agreement with the predictions of NEC. [Vol. 2, No. 2, pp. 122-130 (1987)]
Author(s): K. T. Wong, P. S. Excell, K. T. Wong, P. S. Excell
File Type: Journal Paper
Issue:Volume: 2      Number: 2      Year: 1987
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Title: Mutual Coupling Reduction of Dual-Band Uni-Planar MIMO System Using Neutralization Line Technique
Abstract: This paper presents a low–profile dual-band (2×2) MIMO antenna that works at 2.4GHz, 5.2GHz and 5.8GHz for wireless local area networks (WLAN) applications. A neutralization line technique for enhancing the isolation is used by introducing a strip line with a length of λg/4 at the isolation frequency (2.4GHz) between the radiating elements. The overall dimensions of the proposed antenna are 36×33.5×1.6 mm3. The antenna is fabricated and tested to validate the simulation results. The practical results show fair agreements with the simulated outcomes. The antenna achieves impedance bandwidths from 2.15GHz to 2.52GHz and from 4.5GHZ to 6.45GHz for reflection coefficient |S11| < -10dB. On the other hand, the result of S21 for the two bands is better than -10dB and it has reached to -25dB around 2.4GHz and -35dB around 5.5GHz. The MIMO antenna performance characteristics are reported in terms of scattering parameters, envelope correlation coefficient (ECC), total active reflection coefficient (TARC), channel capacity loss (CCL), diversity gain (DG) and antenna radiation patterns. Analysis of these characteristics indicates that the design is appropriate for the WLAN.
Author(s): A. M. Saleh, T. A. Nagim, R. A. Abd-Alhameed, J. M. Noras, C. H. See
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
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Title: Mutual Coupling Reduction in CBS Antenna Arrays by Utilizing Tuned EM-EBG and Non-planar Ground Plane
Abstract: Radiation surface wave (surface current) on ground plane has a destructive effect on the characteristics of antennas which benefits from a common ground plane, especially Cavity Backed Slot (CBS) antennas. Surface current increases mutual coupling in an antenna array. This in turn causes unwanted characteristics in array applications. The main goal of this work is to design a new modified antenna array achieving less mutual coupling by reshaping ground plane and using tuned Elongated Mushroom Electromagnetic Band Gap (EM-EBG). Moreover, in this study, we focus on the influence of changing depth of EM-EBG holes. In this regard, four different designs for CBS antenna arrays are investigated. The results reveals that by using two new methods, namely stepped ground plane and tuned EMEBG, mutual coupling will be decreased by more than 9 dB. Decrement of mutual coupling improve radiation characteristic of array such as Front to Back Ratio (FBR) by 8 dB. The effectiveness of our design is confirmed by experimental results.
Author(s): S. Manshari, F. H. Kashani, G. Moradi
File Type: Journal Paper
Issue:Volume: 31      Number: 7      Year: 2016
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Title: Multiresolution Time Domain for Studies of Planar Stratified Media
File Type: Conference Paper
Issue:Volume: Posters Session 2      Number:      Year: 2003
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Title: Multiresolution Time Domain Based Different Wavelet Basis Studies of Scattering of Planar Stratified Medium and Rectangular Dielectric Cylinder
Abstract: In this paper, several wavelet bases, namely, the Daubechies, the biorthogonal Coiflet, the Deslauriers-Dubuc interpolating functions, and the cubic spline Battle-Lemarie, are applied to the multiresolution time domain (MRTD) technique for planar stratified media and electromagnetic scattering. These MRTD schemes are studied via field expansions of the scaling functions in one-dimensional (1D) and two-dimensional (2D) cases. A rigorous treatment method for inhomogeneous media structures is given. We have focused here on the study of reflected and transmission coefficients for an electromagnetic wave propagation on a stratified slab media and the scattering width (SW) of a rectangular dielectric cylinder. The 1D propagation characteristics of single and periodical stratified media and the 2D scattering width of the MRTD schemes are compared with the results of the FDTD method. Finally, we describe the computational accuracy of the relative peaks and shifting position errors, via a comparison of the results of the MRTD scheme based on the different basis with those of the FDTD method.
Author(s): Q. Cao, K. K. Tamma, Q. Cao, K. K. Tamma
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
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Title: Multiple Rectangular Slotted Patch Antenna with Roof-top Shaped at 15.3 GHz
Abstract: In this paper, a compact sized, high frequency microstrip patch antenna with probe feeding is designed, simulated, built and tested. The patch of the antenna is diamond shaped which has a rectangular slot in the upper-center. Main contribution of the paper is to perturb the side edges of the patch and to add a rectangular slot. Parametric study of that twosubstrate change was investigated. The proposed structures were simulated by using the Sonnet Suites, a planar 3-D electromagnetic simulation software which gave S11 value of -13.82 dB and gain value of 6.33 dB at 15.3 GHz.
Author(s): M. E. Koca, T. Durak, S. T. Imeci
File Type: Journal Paper
Issue:Volume: 34      Number: 2      Year: 2019
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Title: Multiband Multipolarized Planar Antenna for WLAN/WiMAX Applications
File Type: Conference Paper
Issue:Volume: S19 Finite-Difference Time-Domain Method: Theory and Applications      Number:      Year: 2015
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Title: Multiband Antenna for Wireless Applications Including GSM/UMTS/LTE and 5G Bands
Abstract: A simple ultra thin multiband antenna is introduced. The proposed antenna with four bands covers many wireless applications. The proposed antenna has simple configuration including two open L-shaped slots to create resonat mode at GSM and GPS bands and also two rectangular slots on the radiating element for creating multi resonant modes to meet the specifications of mentioned frequency bands. According to the simple, small and planar configuration, the proposed antenna design is inexpensive and can easily be integrated with the other microwave circuit boards. The proposed antenna has the small size of 10 mm and the total size of 120 mm x 60 mm x 0.5 mm, promising to be used widely in compact and ultra slim handsets.
Author(s): A. J. Khalilabadi, A. Zadehgol
File Type: Journal Paper
Issue:Volume: 34      Number: 2      Year: 2019
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Title: Multiband Antenna for Wireless Applications Including GSM/UMTS/LTE and 5G Bands
File Type: Conference Paper
Issue:Volume: S20 Wideband and Multiband Antennas      Number:      Year: 2018
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Title: Multi-Slot Antenna for Radar Systems
File Type: Conference Paper
Issue:Volume: Recent Antenna Applications      Number:      Year: 2003
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Title: Multi-Fidelity Multi-Grid Design Optimization of Planar Microwave Structures with Sonnet
File Type: Conference Paper
Issue:Volume: EM Simulations Using Sonnet - I      Number:      Year: 2010
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Title: Multi-Fidelity Design Optimization of Planar Inductors with Sonnet
File Type: Conference Paper
Issue:Volume: S41 EM Modeling using Sonnet I      Number:      Year: 2015
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Title: Multi-Bandwidth CPW-Fed Open End Square Loop Monopole Antenna for Energy Harvesting
Abstract: Compact CPW-fed open end square loop monopole antenna is presented. The antenna can harvest ambient power at different radio frequencies of 1.8, 1.9, 2.4 and 5.2 GHz. The multi-band coplanar waveguide antenna (MCPW) is designed and fabricated on a very thin and lowprofile substrate. The proposed antenna is used to measure the ambient spectrum in two different places. One of them is indoor and the other is outdoor, in order to see the effect of the place on the proposed energy harvesting system. A multi-band rectifier circuit is designed and integrated with the proposed antenna. The maximum simulation efficiency is 60.98% at 1.9 GHz and -1 dBm input power. The maximum measured efficiency is 60.57% at 2.5 GHz and -1 dBm RF received power. Also, the proposed rectenna has 53.1% measured efficiency at 2.5 GHz and RF received power of -5 dBm.
Author(s): N. Eltresy, D. Elsheakh, E. Abdallah, H. Elhenawy
File Type: Journal Paper
Issue:Volume: 34      Number: 2      Year: 2019
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Title: Multi-Bandwidth CPW-Fed Open End Square Loop Monopole Antenna for Energy Harvesting
File Type: Conference Paper
Issue:Volume: S42 Wireless Implants for Biomedical Telemetry II      Number:      Year: 2018
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Title: Multi-band Loop Antenna Integrated with a Telephone Handset
File Type: Conference Paper
Issue:Volume: Integrated Antennas for Portable Devices      Number:      Year: 2005
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Title: Multi Band Antenna System for Energy Harvesters
File Type: Conference Paper
Issue:Volume: S37 Wireless Power Transfer and Energy Harvesting: Advances in Modelling and Practice      Number:      Year: 2019
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Title: MTRT - A MODIFIED TRANSVERSE RESONANCE TECHNIQUE
Abstract: In this work a modified formulation of the transverse resonance technique (TRT) is presented. The difference between the usual TRT and the formulation presented here, MTRT, is the equivalent network considered. With the MTRT proposed formulation, mode solution identification requires less arduous work. The complete equation set is described. Numerical results are presented for dispersion characteristics of microstrip lines, coupled microstrip lines and conductor-backed coplanar waveguides (CBCW). When compared to results obtained by other methods, a good agreement is observed. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 19-25]
Author(s): Alfredo Gomes Neto, Creso S. da Rocha, Herve' Aubert Aubert, D. Bajon, H. Baudrand, Alfredo Gomes Neto, Creso S. da Rocha, Herve' Aubert Aubert, D. Bajon, H. Baudrand
File Type: Journal Paper
Issue:Volume: 12      Number: 1      Year: 1997
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Title: Modeling of Planar Multilayered Periodic Arrays using the Method of Lines
Abstract: This paper presents an implementation of the Method of Lines, a semi-analytical method, for the numerical modeling of radiating stratified periodic structures composed of dielectric layers interspersed with metallic patches and slots. Beam scanning antenna arrays and frequency selective surfaces (FSS) are among possible applications. The combined use of the Modified Bioconjuguate Gradient Squared method with Stabilization, an interactive resolution method, together with the Fast Fourier Transform allows for the analysis of a wide array of problems using uniform, high discretization density by considerably speeding up the resolution process and drastically reducing memory requirements. Periodic FSS and slot coupled patch array antennas were simulated. A comparison of simulation results with available literature allows validation of the new approach.
Author(s): Aric Choiniere, Jean-Jacques Laurin, Aric Choiniere, Jean-Jacques Laurin
File Type: Journal Paper
Issue:Volume: 17      Number: 2      Year: 2002
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Title: Modeling of Medium Frequency Propagation Along a Thin Wire Parallel to a Lossy Return Path
File Type: Conference Paper
Issue:Volume: EM Applications using FEKO I      Number:      Year: 2012
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Title: Modeling of Dual-Polarized Frequency Independent Antennas
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling using FEKO - II      Number:      Year: 2008
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Title: Modeling Large Finite Frequency-Selective Surfaces with FEKO
File Type: Conference Paper
Issue:Volume: FEKO Modeling and Analysis - 2      Number:      Year: 2006
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Title: Modeling and Design of Frequency Independent Antennas for Millimeter Wave Electronic Warfare and UHF Platform Integration
File Type: Conference Paper
Issue:Volume: EM Simulations Using FEKO      Number:      Year: 2010
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Title: Mode Conversion Caused by Bending in Photonic Subwavelength Waveguides
Abstract: We study the propagation of light in a subwavelength planar waveguide with an angular bend. We observe the mode conversion of a guided wave with a symmetric beam profile impinging into the bending of a waveguide. The guided wave outgoing from the bend is a mixed set of symmetric and asymmetric modes. The amount of mode conversion through the bend is quantified by calculating the Fourier transform of the electric field profile. It is found that the conversion rate is a function of the bending angle.
Author(s): Y. J. Rodriguez-Viveros, D. Moctezuma-Enriquez, P. Castro-Garay, B. Manzanares-Martinez, C. I. Ham-Rodriguez, E. Urrutia-Banuelos, J. Manzanares-Martinez
File Type: Journal Paper
Issue:Volume: 30      Number: 12      Year: 2015
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Title: MIXED ELEMENT FORMULATION FOR THE FINITE ELEMENT-BOUNDARY INTEGRAL METHOD
Abstract: A mixed element approach using right hexahedral elements and right prism elements for the finite element-boundary integral method is presented and discussed for the study of planar cavity-backed antennas. The mixed element method is shown to decrease the required computation time for geometrically constrained geometries by reducing the unknown count on the open aperture on the cavity. By reducing the unknown count on the surface, the memory and computational cost associated with the boundary integral portion of the solution is decreased versus solutions using only prism elements. The accuracy of the mixed element approach is shown to be comparable with that of a single element approach, especially for far field parameters such as radiation pattern and radar cross section.
Author(s): J. Meese, L. C. Kempel, S.W. Schneider, J. Meese, L. C. Kempel, S.W. Schneider
File Type: Journal Paper
Issue:Volume: 21      Number: 1      Year: 2006
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Title: Miniaturized Omnidirectional UHF RFID Antennas
File Type: Conference Paper
Issue:Volume: S36 Antennas and Arrays      Number:      Year: 2019
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Title: Miniaturized Dual Band RFID Planar Antenna
File Type: Conference Paper
Issue:Volume: Small Antennas - II      Number:      Year: 2010
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Title: Miniaturization of a Broadband Quadrature Hybrid Coupler Using ?-Model Transformation-Based Artificial Transmission Line
Abstract: In this paper, a novel compact broadband quadrature hybrid coupler based on planar artificial transmission line is presented. This coupler can be used for WLAN application at 2.4 GHz. The planar artificial transmission line has been implemented using ?-model technique. The size of the proposed coupler is merely 38% of that of a conventional one. The compact coupler performs well wideband response.
Author(s): V. I. Nejad, A. A. Lotfi-Neyestanak, A. Shahzadi
File Type: Journal Paper
Issue:Volume: 31      Number: 3      Year: 2016
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Title: Miniaturization and Optimization of Meander-line Dipole Antenna Arrays via Orthogonal Array Initialized Hybrid Particle Swarm Optimizer
File Type: Conference Paper
Issue:Volume: Optimization Methods for Electromagnetics      Number:      Year: 2009
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Title: Millimeter Wave Fuze Radome Design Based Bandpass Frequency Selective Surface
Abstract: This paper studies a fuze radome system applied to millimeter waves. The system consists of feed antenna, radome, planar FSS array or curve conformal array. Microstrip antenna is used as the feed antenna. Based on the principle of equispaced and equal period respectively, cross units loading single layer dielectric form planar and curve FSS array. The FSS radome system can improve the permeability of hood to electromagnetic waves (EM) of passband, and reduce the interference of complex EM in the external environment to the system. The FSS radome will not deteriorate radiation characteristics of the feed antenna. The planar FSS radome has a passband of 98.2 GHz to 101.55 GHz with -10dB relative bandwidth of 3.35%. The curve FSS radome has a passband of 96.3 GHz to 101.8 GHz with -10dB relative bandwidth of 5.5%. In addition, the radiation characteristics of the proposed system are analyzed. It is found that the radiation pattern of the antenna is basically consistency before and after loading the radome.
Author(s): M. Zhao, J. Bi, J. Xu, J. Zhao
File Type: Journal Paper
Issue:Volume: 36      Number: 4      Year: 2021
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Title: Microwave/Millimeter Wave Metamaterial Development Using the Design of Experiments Technique
File Type: Conference Paper
Issue:Volume: Metamaterials      Number:      Year: 2005
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Title: Microstrip Inductor Design and Implementation
Abstract: High frequency (HF) microstrip spiral inductor design using analytical formulation with network model and numerical simulation with planar electromagnetic simulator, Sonnet, are given for high power RF application. The simplified lumped element equivalent network model parameters for the spiral inductor are used to obtain the initial dimensions of the spiral inductor for simulation. The spiral inductor is then simulated with planar electromagnetic simulator, Sonnet, using the geometry constructed with the physical dimensions obtained from the network model for the desired inductance value. The parametric study of the spiral inductor is conducted to investigate the variation on its quality factor, self resonance frequency and inductance value. The spiral inductor is implemented on a ceramic substrate and measured. The measurement, simulation, and analytical results are found to be close.
Author(s): A. Eroglu
File Type: Journal Paper
Issue:Volume: 25      Number: 9      Year: 2010
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Title: Microstrip Inductor Design and Implementation
File Type: Conference Paper
Issue:Volume: EM Simulations Using Sonnet - II      Number:      Year: 2010
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Title: Microstrip Fed Multiband Hybrid Fractal Antenna for Wireless Applications
Abstract: A hybrid fractal multiband antenna is designed by integrating Koch curve and meander antenna. Scripting method (*.vbs) is adopted to obtain the hybrid fractal structure using IFS and MATLAB. Final structure is obtained by perturbing the reference fractal shape. Proposed antenna exhibits multiband characteristics capable of operating in four different wireless frequency bands including very popular Bluetooth (2.4 GHz), WiMAX (3.4-3.7 GHz), WLAN 802.11 a/b/g (5.3-6.1 GHz) and Aeronautical radionavigation (8.68-9.05GHz). The antenna has a planar structure, compact size of 39 mm × 32 mm × 1.58 mm and is suitable for wireless applications. Prototype of the proposed structure is developed on easily available and low cost FR4 substrate. The antenna has acceptable values of return loss, VSWR and gain. Measured characteristics are in good agreement with the simulated one.
Author(s): Y. Kumar, S. Singh
File Type: Journal Paper
Issue:Volume: 31      Number: 3      Year: 2016
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Title: Microstrip Antenna Array Optimization Using Surrogate-Based Methodology
File Type: Conference Paper
Issue:Volume: EM – Simulation – Driven Design: Modeling and Optimization      Number:      Year: 2013
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Title: Micro-T Circuit Model for Double and Single Sided Induction Heating Systems
Abstract: A method is given for obtaining a phase terminal equivalent circuit, which is useful for the analysis of traveling wave as well as longitudinal flux induction systems for heating thin metal strips. The excitation is transverse to the direction of strip motion and can be realized as a three phase system or a single phase system where the strip could be ferromagnetic or nonmagnetic. First, a general form of the field solution is obtained using transfer matrices. A variable transformation is then made which makes it possible to derive an equivalent circuit for each planar region in the system. By joining the equivalent circuits in cascade, an equivalent circuit for the complete system is obtained. The voltages and currents in the equivalent circuit relate directly to the field quantities within the actual system.
Author(s): L. J. Qaseer
File Type: Journal Paper
Issue:Volume: 25      Number: 8      Year: 2010
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Title: Metasurface for Controlling the Reflection and Transmission Wavefront Independently
File Type: Conference Paper
Issue:Volume: 2-SE-2 Electromagnetic Characteristics of Complex Media Simulated by Time Domain Method II      Number:      Year: 2018
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Title: Meandered Planar Inverted-F Antenna for PCS Mobile Phone
File Type: Conference Paper
Issue:Volume: Wideband Antennas      Number:      Year: 2005
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Title: Manipulation of Electromagnetic Waves Based on New Unique Metamaterials: Theory & Applications
Abstract: Metamaterials are typically engineered by arranging a set of unit cells in a regular array throughout a region of space, thus, obtaining some desirable macroscopic electromagnetic behavior. The desired property is often one that is not normally found naturally (negative refractive index, near-zero index, etc.). Over the past few years, the flexibilities of the metamaterials in choosing the numerical value of the effective permittivity or permeability have led to kinds of novel theoretical and practical possibilities for different applications, ranging from microwave to optical regime. In this paper, the theoretical mechanism for constructing metamaterials is described, and the unique feature of electromagnetic waves can be manipulated is verified by their applicability to construct various devices or components Some typical application is given, including: (1) novel RF devices realized by optical transformation principle, such as energy concentrators and universal waveguide connectors; (2) metamaterial-based wave absorbers; (3) gain enhancement approach of aperture antennas by planar metamaterial lenses loaded; (4) ultra-thin lenses with dual-polarization filtering features; and (5) beam tunable antennas by metamaterial device. Undoubtely, the reported results suggest promising applications in the next-generation communication system.
Author(s): Q. Qu, K. Zhang, G. H. Yang
File Type: Journal Paper
Issue:Volume: 29      Number: 12      Year: 2014
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Title: Magnetic Propulsion Force Calculation of a 2-DoF Large Stroke Actuator for High-Precision Magnetic Levitation System
Abstract: The design of high-precision magnetic levitation positioning systems requires fast electromagnetic models. Since three-dimensional finite element method (3D-FEM) is very time-consuming, in order to calculate magnetic forces, an interesting alternative is to determine the forces semi-analytically due to the high accuracy with a short calculation time. In this paper, a new compact semi-analytical equation for determining the magnetic propulsion forces of a new ironless two degrees of freedom (2-DoF) actuator for a high-precision magnetic levitation system is presented. The derived equation is based on the magnetic scalar potential and the Lorentz force law. An important result is that this new expression takes also the position dependence of the propulsion forces over the whole planar stroke into account. The calculated propulsion forces from the derived equations and the verification by 3D-FEM (Maxwell 3D) are presented in this paper as well.
Author(s): M. Lahdo, T. Ströhla, S. Kovalev
File Type: Journal Paper
Issue:Volume: 32      Number: 8      Year: 2017
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Title: Low-profile, Broadband Polarization Converting Surface Ground Planes for Antenna Polarization Diversity
File Type: Conference Paper
Issue:Volume: Novel Antennas      Number:      Year: 2009
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Title: Low-profile, Broadband Polarization Converting Surface Ground Planes for Antenna Polarization Diversity
Abstract: A broadband antenna backed by a polarization converting surface ground plane is presented. The conversion of reflected field polarization provides diversity from a single, linearly polarized antenna, while avoiding broadside nulls in the radiation pattern as a function of frequency. Results for a low-profile dipole planar inverted cone antenna ~?/10 above a polarization converting surface indicate greater than 40% bandwidth. Comparison with solid ground planes and high impedance ground planes are discussed, with polarization diversity and lack of broadside nulls identified as key advantages to the proposed design.
Author(s): B. A. Lail, K. Y. Han
File Type: Journal Paper
Issue:Volume: 25      Number: 1      Year: 2010
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Title: Low-Profile Textile Antenna with Omni-Directional Radiation for Wearable Applications
File Type: Conference Paper
Issue:Volume: S24 Applied EM for Biomedical and IoT Radar Technologies      Number:      Year: 2019
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Title: Low-cost Nonplanar Microstrip-line Ferrite Phase Shifter Utilizing Circular Polarization
File Type: Conference Paper
Issue:Volume: Phased Array and Active Antennas      Number:      Year: 2005
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Title: \"Introduction to Antennas\" – an antenna training DVD
File Type: Conference Paper
Issue:Volume: CEM for Applied Analysis and Synthesis      Number:      Year: 2005
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Title: \"Capacity estimation of HF ionospheric Channel\"
File Type: Conference Paper
Issue:Volume: Posters Session 2      Number:      Year: 2003
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Title: Zooming into the Near-fields: Embedding Generalized- and Pseudo-functions in the Solution Space of Maxwell's Equations
File Type: Conference Paper
Issue:Volume: Mathematical Aspects of CEM      Number:      Year: 2013
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Title: Z-diagonalized Planewave/FD Approach for Analyzing TE Polarized Waves in 2D Photonic Crystals
File Type: Conference Paper
Issue:Volume: FDTD Methods and Applications      Number:      Year: 2003
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Title: Yee-based 3D electromagnetic algorithm for discontinuous anisotropic dielectrics with global 2nd-order error
File Type: Conference Paper
Issue:Volume: Advances in Finite Difference Time Domain      Number:      Year: 2009
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Title: X-Band Linear Dielectric Resonator Antenna Array Fed by Dielectric Resonator Power Divider Array
File Type: Conference Paper
Issue:Volume: Advances in Phased Array Modeling      Number:      Year: 2012
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Title: X-Band Isoflux Concentric Circular Antenna Arrays for Image Data Download from LEO Satellites to Ground Stations
Abstract: A circularly polarized isoflux beam synthesized by concentric circular arrays of printed microstrip patch antennas is proposed for X-band transmission of image data from land-imaging LEO satellites to the ground stations. This beam has a wide coverage angle of about 100° of uniform illumination. The paper introduces a novel design of a compact righthand circularly polarized microstrip patch as an element for the concentric circular arrays. The patch antenna has impedance matching bandwidth of about 600 MHz and axial ratio bandwidth of about 170 MHz at 8.1 GHz. A prototype of the proposed patch antenna is fabricated for experimental measurements. The electromagnetic simulation and experimental results show good agreement. A computationally efficient particle swarm optimization (PSO) procedure is developed and applied to find the distribution of the excitation magnitudes over the array elements so as to generate an isoflux beam in all the elevation planes with circular symmetry in the azimuth planes. The phase of excitation is the same for all the array elements. The method proposed to apply the PSO reduces the computational resources to about 6.5% of those required by the conventional method of application. Moreover, the proposed iterative PSO procedure is shown to be very fast convergent.
Author(s): M. A. El-Hassan, K. F. A. Hussein, A. E. Farahat, K. H. Awadalla
File Type: Journal Paper
Issue:Volume: 34      Number: 11      Year: 2019
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Title: Wrapping Existing Electromagnetic Code into an Object-Oriented Scripting Programming Language
File Type: Conference Paper
Issue:Volume: Object Oriented Computational Electromagnetics      Number:      Year: 2006
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Title: Wireless Propagation in Non Line of Sight Urban Areas using Uniform Theory of Diffraction
Abstract: This paper describes a three-dimensional electromagnetic propagation model for signal power prediction in a non line of sight urban area located in Singapore. The model, which is implemented using the Ohio State NEC-BSC V4.2 basic scattering code and is based on ray theory and uniform theory of diffraction (UTD) takes into account first, second, and third order effects including triple reflections and diffractions. The simplified propagation model of Raffles Place, the central business district of Singapore, uses more than 360 geometrical structures and is compared with data measured at 937.6 MHz along a drive route at the site. The results from the propagation model produced reasonable agreement with the measurements showing that a simplified model using UTD can be used to simulate the gross features of electromagnetic scatter in an urban area. It is shown that use of penetrable dielectric building walls are also necessary for accurate prediction of radio wave propagation in urban areas under non line of sight conditions. It is also found that third order scattering effects can be dominant in non line of sight situations and may be necessary for accurate predictions.
Author(s): G. A. Ellis, G. A. Ellis
File Type: Journal Paper
Issue:Volume: 18      Number: 3      Year: 2003
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Title: Wireless Power Transfer via Negative Permittivity Metamaterials as Resonating Elements
File Type: Conference Paper
Issue:Volume: S42 Wireless Power Transfer      Number:      Year: 2017
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Title: Wireless Power Transfer Using Magneto-Electric Dipoles
File Type: Conference Paper
Issue:Volume: S37 Wireless Power Transfer and Energy Harvesting: Advances in Modelling and Practice      Number:      Year: 2019
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Title: Wireless Power Transfer to Closely Coupled Loop Antennas Embedded in Concrete for Sensing
File Type: Conference Paper
Issue:Volume: Wireless Powering of Devices & Energy Harvesting      Number:      Year: 2014
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Title: Wireless Energy Harvesting Using a Negatively Charged UV Antenna
File Type: Conference Paper
Issue:Volume: 3-3-D Wireless Power Transfer and Harvesting      Number:      Year: 2017
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Title: Wireless Communication Applications of the Continuous Transverse Stub (CTS) Array at Microwave and Millimeter Wave Frequencies.
File Type: Conference Paper
Issue:Volume: Phased Array and Active Antennas      Number:      Year: 2005
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Title: Wireless Communication Antennas: Special Requirements And New Designs of Dielectric Resonator Antenna
File Type: Conference Paper
Issue:Volume: Poster Sessions 1      Number:      Year: 2007
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Title: Wireless Body Area Networks: UWB Antenna design and Channel Modeling
File Type: Conference Paper
Issue:Volume: S19 Biomedical Applications      Number:      Year: 2020
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Title: WIREGRID: A NEC2 PRE-PROCESSOR
Abstract: WIREGRID is a pre-processor for the widely used public domain method of moments computer code NEC2. WIREGRID was developed for modelling metallic structures using a mesh of wires. In particular, it has powerful facilities for controlling the density of the mesh, permitting the same basic model to be used for different frequencies, with the code automatically generating a suitable mesh for a particular frequency. WIREGRID is not limited to generating wire meshes: it can also be usefully applied to true thin-wire modelling, for instance for Yagi-Uda and log-periodic antennas. In this paper, the basic philosophy of the code is described, and the code capabilities are detailed. Sufficient detail is presented so that the paper can serve as a reference for code users. The meshing algorithm is briefly described. An example is shown of the automatic mesh generation capabilities applied to an automobile. WIREGRID is available in the public domain via anonymous ftp; details of the ftp sites and hardware requirements are given in the appendices. [Vol. 10, No. 1 (1995), pp 31-39]
Author(s): C. F. du Toit, D.B. Davidson, C. F. du Toit, D.B. Davidson
File Type: Journal Paper
Issue:Volume: 10      Number: 1      Year: 1995
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Title: WIRE-GRID MODELING OF SLOT ANTENNAS
Abstract: The ability of a computer code to model slot antennas is investigated. A comparison of experimental and numerically calculated antenna data is presented. [Vol. 1, No. 1, pp.6-14 (1986)]
Author(s): Jimmy L. Funke, Jimmy L. Funke
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
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Title: Wire Grid Moment Method (NEC) Models of a Patch Antenna
Abstract: Wire grid models of an air-loaded resonant circular patch antenna are used to calculate several observable quantities. The resonant frequency, input reactance, and bandwidth are accurately calculated, but the input resistance is underestimated by the grid models due to the existence of separate currents on both the top and bottom of the measured solid patch. The Lawrence Livermore (NEC3) Method of Moments computer program was used to generage the grid models. Averge wire lengths of about 0.03 wavelengths are required for accurate results. A comparison with other studies suggests that the 0.03 wavelength segmentation may be required because the patch is close to the ground plane (0.0175 wavelengths), and/or because errors in the near field calculation are compounded by the large fraction of energy stored in the near field since the patch is a high Q resonator.
Author(s): P.G. Elliot, S.T. McBride, P.G. Elliot, S.T. McBride
File Type: Journal Paper
Issue:Volume: 4      Number: 3      Year: 1989
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Title: Wire Fault Diagnosis Using Time-Domain Reflectometry and Backtracking Search Optimization Algorithm
File Type: Conference Paper
Issue:Volume: S43 Inverse Finite Element Optimization in Electromagnetic Product Design and Non-Destructive Evalutation II      Number:      Year: 2015
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Title: Wire Fault Diagnosis Based on Time-Domain Reflectometry and Backtracking Search Optimization Algorithm
Abstract: The development of a robust and accurate fault diagnosis approach under various system and fault conditions is a research area of great interest. The objective of this paper is to develop a new non-destructive approach for wiring diagnosis based on Time Domain Reflectometry (TDR) in one hand and on Backtracking Search Optimization Algorithm (BSA) in the other hand. Real-world case studies are investigated to demonstrate the effectiveness and robustness of the proposed approach. Simulation results evaluated from experimental data demonstrate that the proposed approach can be used for effective diagnosis of complex wiring networks.
Author(s): H. Boudjefdjouf, H. R. E. H. Bouchekara, F. de Paulis, M. K. Smail, A. Orlandi, R. Mehasni
File Type: Journal Paper
Issue:Volume: 31      Number: 4      Year: 2016
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Title: WIPL-D Results and Time Domain Response for an Impulse Radiating Antenna (IRA)
File Type: Conference Paper
Issue:Volume: Special Session: Electromagnetic Modeling by WIPL-D      Number:      Year: 2005
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Title: WIPL-D Results and Time Domain Response for an Impulse Radiating Antenna (IRA)
File Type: Conference Paper
Issue:Volume: Special Session: Electromagnetic Modeling by WIPL-D      Number:      Year: 2005
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Title: WIPL-D Parallelization Effort
File Type: Conference Paper
Issue:Volume: Special Session: Electromagnetic Modeling by WIPL-D      Number:      Year: 2005
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Title: WIPL-D Model and Simulation Results for a 6ft Diameter Impulse Radiating Antenna (IRA)
File Type: Conference Paper
Issue:Volume: Advances in Electromagnetic Modeling by WIPL-D Software      Number:      Year: 2006
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Title: WIPL-D Compared to Other EM Codes for the Analysis of Printed Antennas
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling by WIPL-D Code      Number:      Year: 2003
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Title: WIPL Code Validation for Metallic Structures
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling by WIPL-D Code      Number:      Year: 2003
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Title: Wind Turbine RCS Modeling and Validation*
File Type: Conference Paper
Issue:Volume: Topics in Radar Scattering      Number:      Year: 2011
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Title: Wind Power Axial-Flux PM Generator Loss Computation Using Quasi-3D FEA
File Type: Conference Paper
Issue:Volume: S07 Low Frequency Magnetics      Number:      Year: 2016
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Title: Wideband, Scanning Array for Simultaneous Transmit and Receive
File Type: Conference Paper
Issue:Volume: S19 Broadband Antennas and Applications      Number:      Year: 2018
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Title: Wideband Single Arm Spiral Antennas
File Type: Conference Paper
Issue:Volume: S14 EM Modeling using FEKO - II      Number:      Year: 2021
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Title: Wideband Self-adjoint Jacobian Computation with Time-domain Field Solutions
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling with QuickWave/Concerto      Number:      Year: 2008
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Title: Wideband Quasi-Yagi Antenna with Broad-Beam Dual-Polarized Radiation for Indoor Access Points
Abstract: This paper presents a wideband, broad beamwidth, dual-polarized antenna for the indoor access points. Its primary radiating elements are two quasi-Yagi antennas, which are arranged orthogonally. The antenna element employs two balanced directors to broaden bandwidth and avoid the structural conflict of the orthogonal installation. A microstrip-slotline transformer is used in the feeding structure for allowing the wideband operation and high port-to-port isolation. The dualpolarized quasi-Yagi antenna is incorporated with a metallic cavity in order to improve the unidirectional radiation in terms of gain, front-to-back ratio, and beamwidth. The final prototype has been fabricated and tested. The antenna yielded a wide impedance bandwidth covering a frequency range from 1.64 to 3.0 GHz (60%) for both ports with port-to-port isolation of a higher than 25 dB. In addition, at both ports, the antenna achieves stable unidirectional radiation with broad beamwidth, high front-to-back ratio, and high radiation efficiency.
Author(s): S. X. Ta, C. D. Bui, T. K. Nguyen
File Type: Journal Paper
Issue:Volume: 34      Number: 5      Year: 2019
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Title: Wideband Printed Lotus Antenna
File Type: Conference Paper
Issue:Volume: Wideband Antennas      Number:      Year: 2005
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Title: Wideband Printed CPW-fed Binomial Curved Slot Antennas
File Type: Conference Paper
Issue:Volume: Antenna Modeling and Small Antennas      Number:      Year: 2008
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Title: Wideband Power Divider Using Novel Split-Ring Resonator
Abstract: A set of novel split-ring resonator basic block Hybrid-Microwave Integrated-Circuit (HMIC) components (transmission line, open and short stubs) is presented with applications to the RF/Microwave power divider. This new open and short LH HMIC resonators have compact sizes of 0.81 and 1.44 mm2 , respectively. The prototypes of an LH power divider constructed from these basic components have been designed, fabricated, and characterized. The LH power divider including two LH branches shows equal power split from 1 to 7 GHz. The proposed power divider benefit from the miniaturized LH HMIC components and have compact sizes of 2.205 mm2 , respectively. There is a good agreement between the full-wave simulations and measurement results with 0.254-mm thick RT5880 substrate. While maintaining similar performance, a 50% reduction in impedance transformer is achieved in comparison to a conventional design.
Author(s): T. Huang, D. Jiang, H. Hu
File Type: Journal Paper
Issue:Volume: 30      Number: 2      Year: 2015
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Title: Wideband Open Sleeve Dipole Antenna
File Type: Conference Paper
Issue:Volume: S45 UWB and Multi-Band Antennas II      Number:      Year: 2016
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Title: Wideband Octagonal Dual Circularly Polarized Sub-array Antenna for Ku-Satellite Systems
Abstract: In this paper the analysis and design of a dual circularly polarized 4×4 antenna array operating in Ku-band are discussed with emphasis on its sequential feeding network. The dual circular polarization is achieved by feeding a stacked octagonal patches with a wideband branch line coupler. The proposed 4×4 antenna array is based on two separate sequential feeding networks for LH and RH circular polarizations. The advantage of the proposed feeding network is that it is implemented on a single layer. Simulation results by using both HFSS and CST are presented for comparison. In addition, experimental verifications are presented.
Author(s): K. M. Ibrahim, W. M. Hassan, E. A. Abdallah, A. M. Attiya
File Type: Journal Paper
Issue:Volume: 35      Number: 12      Year: 2020
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Title: Wideband Multi-Port Network Integrated by 3-dB Branch-Line Couplers
Abstract: The design of a multi-port network integrated by symmetrical alignment of four 3-dB branch-line couplers (BLCs) for wideband communication applications is presented. The BLC is designed with the implementation of stub impedance at each port’s transmission line and defect ground structure (DGS) underneath the shunt branches of BLC to improve bandwidth. The designs of the BLC and the multi-port network are performed by using CST Microwave Studio, a three-dimensional (3D) electromagnetic wave simulator. The designed wideband BLC and multi-port are fabricated, and their wideband performances of 2.3 to 5.3 GHz are verified.
Author(s): N. A. M. Shukor, N. Seman, T. A. Rahman
File Type: Journal Paper
Issue:Volume: 33      Number: 7      Year: 2018
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Title: Wideband MIMO Directional Antenna Array with a Simple Meta-material Decoupling Structure for X-Band Applications
Abstract: In this paper, a compact wideband MIMO directional antenna array with a single-layered meta-material is proposed to realize high isolation. The meta-material decoupling structure, which is composed of a modified split-rings and a square loop structure, is suspended over the two antenna elements to reduce the mutual coupling. The achieved results show that the proposed antenna array owns a −10 dB impedance bandwidth ranging from 8.5 GHz to 11.5 GHz. Furthermore, by loading the proposed meta-material superstrate over the two-element MIMO antenna, the designed MIMO antenna array not only has good performance but also enhances the isolation to be more -15 dB within the operating frequency band. In addition, the performances of the proposed antenna array are also tested by radiation pattern, gain, envelope correlation coefficient, diversity gain, total active reflection coefficient and so on. Therefore, these simulation results prove that the proposed wideband MIMO directional antenna array is a suitable candidate for X-band communication.
Author(s): J. Jiang, Y. Li, L. Zhao, X. Liu
File Type: Journal Paper
Issue:Volume: 35      Number: 5      Year: 2020
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Title: Wideband Microstrip Patch Antennas with Transverse Electric Modes
Abstract: A wideband microstrip patch antenna, exciting the fundamental transverse electric (TE) mode, is investigated. The excitation of the TE mode is facilitated through replacing both of the patch and ground plane of a conventional microstrip antenna with artificial magnetic conductors (AMC), consisting of unipolar compact photonic bandgap (UC-PBG) unit cells. The AMC patch and the ground plane of this antenna behave as magnetic conductors within the bandgap region of the unit cells. Similar to conventional patch antennas, it is shown that by cutting a U-shaped slot in the AMC patch, wideband characteristics are realized. The antenna shows a 40% impedance bandwidth and operates at the TE10 mode. Moreover, the width of the patch is 1.75 times smaller than its length, reducing the overall size of the antenna by about 60%, compared with the conventional U-slot PEC antenna supporting the transverse magnetic (TM) mode.
Author(s): T. Mitha, M. Pour
File Type: Journal Paper
Issue:Volume: 35      Number: 8      Year: 2020
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Title: Wideband Microstrip Patch Antennas with Transverse Electric Modes
Abstract: A wideband microstrip patch antenna, exciting the fundamental transverse electric (TE) mode, is investigated. The excitation of the TE mode is facilitated through replacing both of the patch and ground plane of a conventional microstrip antenna with artificial magnetic conductors (AMC), consisting of unipolar compact photonic bandgap (UC-PBG) unit cells. The AMC patch and the ground plane of this antenna behave as magnetic conductors within the bandgap region of the unit cells. Similar to conventional patch antennas, it is shown that by cutting a U-shaped slot in the AMC patch, wideband characteristics are realized. The antenna shows a 40% impedance bandwidth and operates at the TE10 mode. Moreover, the width of the patch is 1.75 times smaller than its length, reducing the overall size of the antenna by about 60%, compared with the conventional U-slot PEC antenna supporting the transverse magnetic (TM) mode.
Author(s): T. Mitha, M. Pour
File Type: Express Journal Paper
Issue:Volume: 35      Number: 8      Year: 2020
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Title: Wideband Microstrip Endfire Antenna based on SIW and Magnetic Dipole
File Type: Conference Paper
Issue:Volume: 1-P1-C Wideband and Multiband Antennas      Number:      Year: 2017
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Title: Wideband LTCC Vertical-Fed Dipole Antenna for Millimeter-Wave Applications
File Type: Conference Paper
Issue:Volume: 2-2-B Millimeter Wave and Terahertz Antennas      Number:      Year: 2017
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Title: Wideband Low Profile Multi-Polarization Reconfigurable Antenna with Quasi-cross-shaped Coupling Slot
Abstract: A wideband low profile multi-polarization reconfigurable antenna with quasi-cross-shaped coupling slot is proposed. The antenna consists of an upper oval radiating patch, the quasi-cross-shaped coupling slot, fork-shaped folded feed lines and a reconfigurable Wilkinson power divider network with four pairs of p-in diodes. The antenna reconfigurable polarization modes change among ±45° Linear polarization (LP), dual-LP, left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP) by controlling the ON/OFF states of the p-i-n diodes. The designed prototype has been fabricated and measured. Good agreement between the measured and simulated results is achieved. Measured results show that the antenna has wide impedance bandwidth (over 21.35% for LP and 17.70% for CP) and axial ratio (AR) bandwidth (16.13% for LHCP and 16.88% for RHCP). The average realized gains are about 7.6 dBi for different polarization modes. The proposed antenna has the advantages of multi-polarization reconfigurable ability, wide bandwidth, low profile, and high gains, which make it possible to be applied to wireless communication systems.
Author(s): Q. Xu, Z. Liu, S. Liu, X. Kong, Z. Huang, B. Bian, Q. Yu, J. Qin
File Type: Journal Paper
Issue:Volume: 35      Number: 3      Year: 2020
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Title: Wideband High-Gain Fabry-Perot Resonator Antenna with Small Footprint Dielectric Superstrates and a Conical Short Horn
File Type: Conference Paper
Issue:Volume: 2-1-B Modeling, Optimization and Design of Antennas      Number:      Year: 2017
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Title: Wideband Hexagonal Fractal Antenna on Epoxy Reinforced Woven Glass Material
Abstract: In this paper a novel hexagonal-circular Fractal antenna is proposed for wideband applications. The proposed antenna is made of iterations of a circular slot inside a hexagonal metallic patch with a transmission line and is fabricated on low cost epoxy matrix reinforced woven glass material. Measurement shows that with a dimension of 0.36?0×0.36?0×0.0071?0 (where ?0 is the lower edge frequency of the operating band), the proposed antenna achieves a wide impedance bandwidth ranging from 1.34 GHz to 3.44 GHz (88%). The proposed antenna also achieves high gain and exhibits a stable radiation pattern which makes it suitable for many wireless communications such as DCS-1800, PCS-1900, IMT-2000/UMTS, ISM (including WLAN), Wi-Fi and Bluetooth.
Author(s): M. A. Dorostkar, R. Azim, M. T. Islam, Z. H. Firouzeh
File Type: Journal Paper
Issue:Volume: 30      Number: 6      Year: 2015
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Title: Wideband GCPW-Fed Dielectric Resonator Antenna for WLAN Applications
File Type: Conference Paper
Issue:Volume: S19 Broadband Antennas and Applications      Number:      Year: 2018
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Title: Wideband Filtering Crossover Based on Ring Resonator with Sharp Rejection
Abstract: A wideband filtering crossover based on ring resonators with sharp rejection is proposed in this paper. Four transmission zeros near the crossover passband can be adjusted conveniently by the even/odd-mode characteristic impedance of the coupled lines. A high selectivity wideband filtering crossover located at 3.0 GHz is designed and fabricated for verification. Good filtering performance and high selectivity for the crossover are realized and experimentally verified.
Author(s): W. Yang, W. Feng, W. Che
File Type: Journal Paper
Issue:Volume: 32      Number: 10      Year: 2017
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Title: Wideband Fabry-Perot Cavity Antenna
File Type: Conference Paper
Issue:Volume: 2-1-B Modeling, Optimization and Design of Antennas      Number:      Year: 2017
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Title: Wideband Equivalent Circuit Model and Parameter Computation of Automotive Ignition Coil Based on Finite Element Analysis
Abstract: This paper presents a coupled fieldcircuit method to predict the wideband characteristic of ignition coils. A lumped circuit model is proposed, which separates the winding of ignition coil into individual sections. In this circuit model, the capacitance between sections, turn-toturn series capacitance of each single section and inductance of winding are calculated by Finite Element Analysis (FEA). This parameter identification is based on the energy principle. In addition, this paper analyzes the influence of frequency on the magnetic-flux distribution and the inductance, using the finite-element model with T- ? formulation. The parameter inductance applied to the circuit model is classified into high frequency inductance and low frequency inductance. Through contrasting the measured and calculated result in frequency and time domain, reliability and feasibility of the presented method in this paper is verified.
Author(s): J. Jin, W. Quan-di, Y. Ji-hui, Z. Ya-li
File Type: Journal Paper
Issue:Volume: 25      Number: 7      Year: 2010
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Title: Wideband Dual-polarized Vivaldi Antenna with Gain Enhancement
Abstract: A wideband dual-polarized Vivaldi antenna covering 1.85-18.3 GHz band with enhanced gain is presented in this letter. The proposed antenna consists of two Vivaldi antenna elements (VAEs), which are designed based on the conventional Vivaldi antenna. Dual-slot structure is employed to improve the gain of the conventional Vivaldi antenna. As a result, sphericallike waves across the slot aperture of the conventional Vivaldi antenna can be transformed to be plane-like waves and thus gain enhancement can be achieved. In order to extend lower frequency limit of the VAE, elliptical slots are adopted. The proposed dual-polarized Vivaldi antenna is obtained by combining two VAEs in a cross-shaped form. The prototype is simulated, fabricated, and measured. A good agreement between EM simulated and measured results evidently validates the proposed antenna.
Author(s): H. Lv, Q. Huang, J. Hou, J. Liu
File Type: Journal Paper
Issue:Volume: 33      Number: 9      Year: 2018
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Title: Wideband Dielectric Resonator Antenna with Parasitic Strip
File Type: Conference Paper
Issue:Volume: Dielectric Resonator Antennas      Number:      Year: 2005
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Title: Wideband Dielectric Resonator Antenna Excited by a Closed Circular Loop GCPW Slot for WLAN 5.5 GHz Applications
Abstract: A dielectric resonator antenna is designed for WLAN 5.5 GHz band applications in this study. The dielectric resonator antenna is fabricated on a cheap FR4 substrate with grounded CPW (GCPW) structure. A new closed circular loop GCPW slot structure is employed to obtain wideband impedance matching. Results of the designed dielectric resonator antenna show that good agreement between simulated and measured reflection coefficients, radiations, and antenna gains is observed. The measured -10 dB bandwidth of the dielectric resonator antenna is 1.6 GHz (28.5%, 4.8 – 6.4 GHz), which covers the WLAN 5.5 GHz band.
Author(s): W.-C. Weng, M.-C. Chang, M.-S. Chen
File Type: Journal Paper
Issue:Volume: 34      Number: 2      Year: 2019
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Title: Wideband and High Gain Shared-Aperture Fabry-Perot Resonator Microstrip Antenna
File Type: Conference Paper
Issue:Volume: 2-P2-E Antennas with Advanced/Artificial Materials and Processes      Number:      Year: 2017
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Title: Wideband and Dual-Band Loaded Monopole Dielectric Resonator Antenna
File Type: Conference Paper
Issue:Volume: Recent Antenna Applications      Number:      Year: 2003
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Title: Wide-Angle Claerbout Scheme for Three-Dimensional Time Domain Parabolic Equation and its CN, ADI, AGE Solutions
Abstract: The wide-angle Claerbout scheme of three-dimensional time domain parabolic equation (Claerbout-TDPE) is derived in this paper, which can provide accurate results at angles within 25° of the paraxial direction. At first, the Crank-Nicolson (CN) type is introduced to discretize the Claerbout-TDPE. In this way, a three-dimensional EM scattering problem can be divided into a series of two-dimensional ones. Moreover, the alternating direction implicit (ADI) type is utilized to the Claerbout-TDPE. In this way, a three-dimensional EM scattering problem can be further reduced to a series of one-dimensional ones. Furthermore, the alternating group explicit (AGE) type is introduced to the Claerbout- TDPE for higher computational efficiency. Comparisons are made among the CN, ADI and AGE types in the numerical results.
Author(s): Z. He, H.-C. Yin, R.-S. Chen
File Type: Journal Paper
Issue:Volume: 33      Number: 3      Year: 2018
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Title: Wide-Angle Absorbing Boundary Conditions for Low and High-Order FDTD Algorithms
Abstract: Wide-angle performance of the perfectlymatched- layer absorbing boundary conditions for the finite-difference time-domain (FDTD) method is investigated for efficient modeling of electrically large structures. The original split-field, uniaxial and convolutional perfectly-matched-layer formulations are all optimized to produce near-flat absorption for incidence angles up to 87 degrees. Optimized wide-angle parameters are derived for both the standard FDTD method and a high-order finite-volumes-based variant. The investigated high-order algorithm in particular is shown to produce improved wide-angle performance over standard FDTD for all three perfectly-matched-layer variants even when they are optimized for normal wave incidence. In all cases, optimization is managed through appropriate choices of modeling parameters which can be directly and unobtrusively applied to existing FDTD codes.
Author(s): Mohammed F. Hadi
File Type: Journal Paper
Issue:Volume: 24      Number: 1      Year: 2009
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Title: Wide Stop-Band Microstrip Lowpass Filter with Sharp Roll-off Using Hairpin Resonators
Abstract: A compact microstrip lowpass filter with wide stop-band and sharp roll-off skirt is presented. The structure consists of a combination of modified Hairpin units. The cut-off frequency is 3.1 GHz. The proposed low-pass filter has a very good performance such as extended stop-band bandwidth from 3.36 GHz to 21.5 GHz with the insertion-loss higher than -20.0 dB, sharp roll-off, low insertion-loss, and high return-loss in the passband. The filter is designed, fabricated, and tested and the measured results are in good agreement with the EM-simulation results.
Author(s): M. Hayati, H. S. Vaziri
File Type: Journal Paper
Issue:Volume: 28      Number: 10      Year: 2013
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Title: Wide Bandwidth Endfire Antenna with Log-Period Directors
Abstract: This paper presents the design and implementation of a novel wide bandwidth endfire antenna with log-periodic directors. The feeding structure of the proposed antenna includes a balun which is formed using a pair of microstrip-to-slotline transitions. The proposed antenna has three resonant frequencies in the operating frequency band. Both simulation and measurement results show that the operating frequency band of the antenna for S11 < -10 dB covers the wide bandwidth (5 GHz – 10 GHz), and the relative bandwidth is 67%. Far field measurements in azimuth plane and elevation plane show that the radiation patterns are stable and end fire within the operating band at frequencies of 5 GHz, 7 GHz, 8 GHz, 10 GHz. The proposed antenna radiates a well-defined endfire beam, with a front-to-back ratio > 18 dB and cross polarization level below -28 dB. The dimension of the proposed antenna is 26 mm × 27 mm. Good return loss and radiation pattern characteristics are obtained and measured results are presented to validate the usefulness of the proposed antenna structure for wide bandwidth endfire applications.
Author(s): Y. Sun, G. Wen, H. Jin, P. Wang, Y. Huang, J. Li
File Type: Journal Paper
Issue:Volume: 30      Number: 11      Year: 2015
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Title: Wide Band Wide Scanning Angle Phased Array Antenna Design in Ku-band
File Type: Conference Paper
Issue:Volume: 1-P1-C Wideband and Multiband Antennas      Number:      Year: 2017
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Title: Wide Band Flexible Terahertz Metasurface Wave Plate
File Type: Conference Paper
Issue:Volume: 1-SP-4 Metasurfaces/Metamaterials Theory, Design and Applications I      Number:      Year: 2018
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Title: Wide Band Antenna with Ultra-smooth Spectral Characteristics
File Type: Conference Paper
Issue:Volume: S09 Advances in Electromagnetic Modeling by WIPL-D - I      Number:      Year: 2020
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Title: Wide Band Antenna with Ultra-smooth Spectral Characteristics
Abstract: Understanding the evolution of Universe is, in the forefront of, the modern day observational cosmology. It requires precise and accurate measurement of cosmological signal, orders of magnitude weaker than the bright sky background. Detection of such a signal having distinct spectral signature, needs an antenna with frequency independent characteristics over more than an octave bandwidth. A spherical monopole antenna has been designed to operate in the frequency range 50-200 MHz with a spectral smoothness of about few parts in 104. The structure has been modeled and optimized using WIPL-D, to minimize spectral features arising out of abrupt reflections of surface currents and frequency dependent radiation patterns. A prototype has been built to validate the design. This paper presents the methodology adopted in the overall antenna design, experiences in its prototyping and simulation and the measurement results.
Author(s): A. Raghunathan, B. S. Girish, R. Somashekar, K. S. Srivani, S. Singh, R. Subrahmanyan, N. U. Shankar, M. S. Rao, J. Nambissan T.
File Type: Journal Paper
Issue:Volume: 35      Number: 11      Year: 2020
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Title: Why does SBVH outperform KD-tree on parallel platforms?
File Type: Conference Paper
Issue:Volume: S41 Parallel and GPU Computations      Number:      Year: 2016
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Title: Whistler Mode Wave Refractive Index in a Finite Temperature Anisotropic Plasma Medium
Abstract: Whistler mode waves, which exist in a magnetized plasma, are prevalent in the Earth's magnetosphere in the extremely low frequency (ELF) and very low frequency (VLF) bands (100 Hz - 30 kHz). Due to the impact of whistler mode waves on space weather processes, it is important to accurately predict the propagation trajectory of these waves and their properties. Numerical raytracing determines the power flow path of the whistler mode waves in the anisotropic medium of the magnetosphere based on local calculation of the refractive index. In the majority of previous work, magnetospheric raytracing has been implemented assuming a cold background plasma (0 K). However, a more accurate description of the magnetospheric plasma includes a background temperature of about 1 eV (11600 K). We present solutions to the dispersion relation that include the effects of finite electron and ion temperatures on the wave refractive index using a warm plasma formulation. Finite temperature effects of the background plasma are shown to be most significant for highly oblique wave normal angles where the refractive index is bounded to smaller values than in the ideal cold plasma approximation.
Author(s): M. Golkowski, A. Maxworth
File Type: Journal Paper
Issue:Volume: 33      Number: 10      Year: 2018
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Title: Whistler Mode Wave Numerical Raytracing in a Finite Temperature Anisotropic Plasma Medium
File Type: Conference Paper
Issue:Volume: S39 Modeling Electromagnetic Waves in Plasma Environments      Number:      Year: 2018
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Title: Whispering Gallery Mode Laser in an Elliptical Microring
Abstract: Studies on whispering gallery mode (WGM) laser in microrings have been limited to circular geometry. Elliptical microring lasers, despite their potential engineering use, have not been analyzed to guide experiments. This paper introduces a computationally efficient method for determining the WGM laser resonance and the laser field distribution in an elliptical microring. An analytical method is applied to avoid computing high order Mathieu functions. Both WGM resonant frequencies and electromagnetic (EM) field distributions are computed and presented in this paper. Computed results clearly show that the WGM laser field is concentrated on the outer surface of the microring. Results also show that the eccentricity of the ellipse affects the distribution of resonant frequencies and the laser field.
Author(s): R. Baktur, L. W. Pearson, J. M. Ballato
File Type: Journal Paper
Issue:Volume: 25      Number: 2      Year: 2010
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Title: What Do You Mean By a Solution to an Operator Equation?
Abstract: The main thrust of this presentation is to illustrate that for many electromagnetic field problems the quality of the solution is very subjective and not objective at all. Therefore to classify solutions on a subjective criteria which is not scientific will create more problems than it would solve. The underlying feature to all this is what do "we mean" by a solution.
Author(s): T.K. Sarkar, E. Arvas, T.K. Sarkar, E. Arvas
File Type: Journal Paper
Issue:Volume: 4      Number: 3      Year: 1989
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Title: Well-Conditioned CFIE for Scattering from Dielectric Coated Conducting Bodies above a Half-Space
Abstract: In this paper, a well-conditioned coupled combined-field integral equation called the electric and magnetic current combined-field integral equation (JCFIE-JMCFIE) is proposed for the analysis of electromagnetic scattering from coated targets above a lossy half-space. The halfspace multilevel fast multipole algorithm (MLFMA) is used to reduce computational complexity. The inner-outer flexible generalized minimal residual method (FGMRES) was used as the iterative solver to further speed up the convergence rate. Numerical results were presented to demonstrate the accuracy and efficiency of the proposed method.
Author(s): D. Ding, J. Ge, R. Chen
File Type: Journal Paper
Issue:Volume: 25      Number: 11      Year: 2010
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Title: Well-Conditioned 2D Models of Rod Arrays for Accelerating 3D Simulations of Photonic Crystals and Plasmonic Structures
File Type: Conference Paper
Issue:Volume: S06 Advanced Methods for Numerical Electromagnetic Analysis - I      Number:      Year: 2021
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Title: Wearable Textile Fabric Based 3D Metamaterials Absorber in X-Band
Abstract: In this paper, a new wearable (flexible) textile fabric-based 3D metamaterials absorber (MMA) structure is proposed. The proposed MMA was created from three layers; weft-knitted fabric, silicone, and plain weave fabric and then, it was simulated in Computer Simulation Technology (CST). It was obtained maximum absorption power (99.66%) at 9.38 GHz, and the average absorption power of 81-95% was obtained in the frequency range of 8 to 12 GHz depending on the incident angle in the simulation. The effect of the wearable textile structure on absorption was investigated. When compared with other materials, it can be said that the proposed MMA is broadband, incident angle independent, TE and TM polarization-independent, flexible, breathable, wearable, ease of fabrication, practical, low weight, and cost advantage. With this designed the textile fabric-based MMA, it can be obtained both low reflection coefficients and low transmission coefficients at broadband X-band frequencies. This provides a good solution for the cloaking of radar systems.
Author(s): E. Delihasanlar, A. H. Yuzer
File Type: Journal Paper
Issue:Volume: 35      Number: 2      Year: 2020
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Title: Wearable Radar Antenna Array Design on Flexible PCB for Visually Impaired People
File Type: Conference Paper
Issue:Volume: S47 Advanced Antenna Designs for Emerging Wireless Applications      Number:      Year: 2021
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Title: Wearable Graphene Based Curved Patch Antenna for Medical Telemetry Applications
Abstract: In order to explore the expediency of graphene for biotelemetry in Wireless Body Area Network (WBAN), conformal square patch antenna design has been presented in this paper. The operational efficiency of the antenna is attributed to the incredible properties of graphene as patch conductor. The proposed antenna designed for operating in band from 1-4.88 GHz is fed with microstrip line and quarter wave transformer for impedance matching. The antenna however achieves best performance at 2.4 GHz in ISM band with good impedance matching, reasonable dB gain and high radiation efficiency for the wideband of frequencies in GHz range. The proposed wearable conformal graphene based antenna is optimally positioned at distance from body to make it suitable for Ultra Wide Band (UWB) health monitoring systems fulfilling the requirements of wideband operation, high gain and improved radiation efficiency at reduced SAR.
Author(s): R. Bala, R. Singh, A. Marwaha, S. Marwaha
File Type: Journal Paper
Issue:Volume: 31      Number: 5      Year: 2016
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Title: Wearable Antennas for Body-Centric Communications: Design and Characterization Aspects
Abstract: Wearable antennas exhibit numerous challenges in terms of design and optimization due to the specific environment in which they operate. Therefore, the design of such antennas is a non-trivial task, as multiple constraints have to be satisfied. We present an algorithm for design-and-optimization of flexible wearable antennas with high radiation efficiency and low specific absorption rate, that takes into account the dielectric loading of the human body. It provides a list of feasible antenna designs, not just a single solution, and identifies the optimal wearable antenna design. Numerical examples on the design and optimization of a wearable antenna (based on a dipole structure with a reflector) to demonstrate the validity and efficiency of the proposed algorithm are given. The optimal antenna design shows robust on-body performance and provides a suitable balance between small antenna size (antenna surface is 2214 mm2), high radiation efficiency (57.73%), and low value of the maximum 10 g average SAR (0.112 W/kg) on a homogeneous semisolid phantom. Finally, the optimal antenna design is fabricated. The antenna performance is studied under different conditions: on a homogeneous semisolid phantom, on a liquid phantom, on a three-layer semisolid phantom, on a human arm and in the free space. A good agreement between simulated and measured antenna performance is observed.
Author(s): A. G. Al-Sehemi, A. A. Al-Ghamdi, N. T. Dishovsky, N. T. Atanasov, G. L. Atanasova
File Type: Journal Paper
Issue:Volume: 34      Number: 8      Year: 2019
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Title: Wearable and implantable RFIDs for Human-body Sensing
File Type: Conference Paper
Issue:Volume: RFIday 2010      Number:      Year: 2010
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Title: Ways to Improve Computational Efficiency of GRE
File Type: Conference Paper
Issue:Volume: High Frequency Techniques      Number:      Year: 2012
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Title: Waveport Modeling for DGTD Method and Its Applications
File Type: Conference Paper
Issue:Volume: 2-SE-3 Advances in Electromagnetic Theory and Simulation Techniques II      Number:      Year: 2018
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Title: Wavelet Packet Transform with Iterative Technique based on Method of Moments
File Type: Conference Paper
Issue:Volume: MoM and Applications      Number:      Year: 2007
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Title: Wavelet Packet Transform of the Method of Moments Matrix for Large-Scale Problems
File Type: Conference Paper
Issue:Volume: MoM and Applications      Number:      Year: 2007
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Title: Wavelet Model of Multivariate Prior Covariance
File Type: Conference Paper
Issue:Volume: S59 Uncertainty Quantification and Modeling for Complex Applications      Number:      Year: 2018
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Title: Wavelet Analysis of Permanent Magnet Synchronous Machine Flux Density Harmonic Content With Different Pole Number Designs
File Type: Conference Paper
Issue:Volume: Advances in CEM      Number:      Year: 2004
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Title: Waveguides with Hyperbolic Metasurface Claddings
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2014
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Title: Waveguides with Hyperbolic Metasurface Claddings
File Type: Conference Paper
Issue:Volume: Computational Methods in Nanoelectromagnetics      Number:      Year: 2014
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Title: Waveguide Mode Computation through Smoothed Particle Electromagnetics
File Type: Conference Paper
Issue:Volume: Modeling, Design and Optimization of Complex Electromagnetic Systems      Number:      Year: 2008
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Title: Waveguide Microwave Imaging: Solids Volume Fraction of Particulate Materials
Abstract: An original modeling-based microwave imaging technique for determining the volume fraction of solid material in dielectric powders is described. The desired characteristic is determined by analyzing S-parameter measurements in a waveguide containing the sample with the help of an artificial neural network trained by data from 3D FDTD simulation. The powder sample is represented by a mixture of air and millimeter-scale particles reproduced in the FDTD model. Computational tests with 20 to 40 mm cubic samples of SiC and ZrO2 powders in WR340 show that the solids volume fraction is determined with less than 5% error.
Author(s): A. V. Brovko, E. K. Murphy, V. V. Yakovlev
File Type: Journal Paper
Issue:Volume: 30      Number: 11      Year: 2015
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Title: Waveguide Filter Modeling and Simulation using Mode-matching, Fullwave Network Analysis and Swarm Optimization
Abstract: This paper presents the modeling of waveguide bandpass filter synthesis. It consists of a combination of the most appropriate and reliable methods and techniques of analysis, simulation and optimization used in determined order and leading to a fast and accurate method of filter synthesis. An example of a forth-order filter synthesis is given, employing a symmetric configuration and symmetric response. The obtained results, reference measurement and commercial software simulator results are compared for validation.
Author(s): I. Bouchachi, J. Mateu, M. L. Riabi
File Type: Journal Paper
Issue:Volume: 32      Number: 2      Year: 2017
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Title: Wavefront Reconstruction Using a Dispersive Propagation Model
File Type: Conference Paper
Issue:Volume: Inverse Scattering in Medicine and Biology - State of the Art, Recent Advances and Future Trends      Number:      Year: 2008
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Title: Waveform of Class E Power Amplifiers with PI Network
File Type: Conference Paper
Issue:Volume: 4-1-C Passive/Active Microwave and Terahertz Devices      Number:      Year: 2017
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Title: Wave Propagation on a Circular Chiral Rod
File Type: Conference Paper
Issue:Volume: Guided Waves in Non-Standard Media      Number:      Year: 2008
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Title: Wave Propagation and Radio Network Planning Software WinProp added to the Electromagnetic Solver Package FEKO
File Type: Conference Paper
Issue:Volume: S19 Modeling with FEKO      Number:      Year: 2017
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Title: Wave Propagation Along a Thin Vertical Wire Antenna Placed in a Horizontally Layered Medium
File Type: Conference Paper
Issue:Volume: Fundamental Electromagnetics: Materials and Boundaries      Number:      Year: 2010
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Title: Wave Concept Iterative Process Merges with Modal Fast Fourier Transformation to Analyze Microstrip Filters.
Abstract: A novel iterative method based on the concept of waves is reported for use in the field theory, computer aided design and optimization of high frequency integrated circuits. It consists of a recursive relationship between a given source and reflected waves from the discontinuity plane which is divided into cells. A high computational speed has been achieved by using Modal Fast Fourier Transformation (MFFT). The theory as well as its procedure implementation is described. Numerical results are succussfully compared with published data.
Author(s): A. Gharsallah, R. Garcia, A. Gharbi, H. Baudrand, A. Gharsallah, R. Garcia, A. Gharbi, H. Baudrand
File Type: Journal Paper
Issue:Volume: 16      Number: 1      Year: 2001
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Title: Wave Concept in MoM-GEC Formalism
File Type: Conference Paper
Issue:Volume: S34 Computational Electromagnetics Advanced Algorithms and Emerging Applications IV      Number:      Year: 2017
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Title: Wave Characteristics Of Layered Anisotropic Media for Remote Sensing Applications
File Type: Conference Paper
Issue:Volume: S49 EM Modeling and Applications - II      Number:      Year: 2021
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Title: Water-based Metamaterial Absorber for Broadband Electromagnetic Wave Absorption
File Type: Conference Paper
Issue:Volume: 2-1-C Properties, Modelling and Novel Concepts of Artificial Electromagnetic Structures I      Number:      Year: 2017
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Title: Water Extraction of SAR Image Based on Region Merging Algorithm
File Type: Conference Paper
Issue:Volume: 2-1-E Synthetic Aperture Radar Techniques and Applications I      Number:      Year: 2017
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Title: Water Content and Tissue Composition Effects on Microwave Tomography Results
File Type: Conference Paper
Issue:Volume: Microwave Imaging and Inverse Problems      Number:      Year: 2008
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Title: Waffle Iron Filter Design using WIPL-D
File Type: Conference Paper
Issue:Volume: S20 Advances in Electromagnetic Modeling by WIPL-D - II      Number:      Year: 2020
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Title: W-Band Longitudinal-Slot Coupling Four-Way SIW Power Combiner/Divider
File Type: Conference Paper
Issue:Volume: 3-P3-H Passive/Active Microwave and Terahertz Devices      Number:      Year: 2017
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Title: W-band High-Gain Antenna Arrays with Low-Loss Gap Waveguide Feeding Network
File Type: Conference Paper
Issue:Volume: 2-1-B Modeling, Optimization and Design of Antennas      Number:      Year: 2017
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Title: W-band Electronic Focus-Scanning by a Reconfigurable Transmitarray for Millimeter-Wave Imaging Applications
Abstract: A w-band electronic focus-scanning function, which is desired for high-resolution fast-speed millimeterwave imaging systems, is realized by a reconfigurable transmitarray antenna (RTA). As a two-layer structure, each RTA element is integrated with two packaged PIN diodes symmetrically within a limited area (1.6×1.6mm2). When a linearly polarized electromagnetic wave incidents on this reconfigurable element, an orthogonally polarized transmission wave is generated, with the ability of 1-bit phase adjustment (0°/180°). Using this element, a 32×2 reconfigurable transmitarray is designed and fabricated to realize 1-D steerable focal points in a near-distance focal plane. The measured focal points agree well with the design, illustrating the feasibility of the proposed RTA for w-band microwave imaging systems.
Author(s): X. Pan, F. Yang, S. Xu, M. Li
File Type: Journal Paper
Issue:Volume: 35      Number: 5      Year: 2020
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Title: Voxel-Based Inverse Methods
File Type: Conference Paper
Issue:Volume: Nondestructive Evaluation and Materials Characterization      Number:      Year: 2010
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Title: Vortex Beam Optimization Design of Concentric Uniform Circular Array Antenna with Improved Array Factor
Abstract: In this paper, an improved array factor of the concentric uniform circular array (CUCA) antenna is proposed for the orbital angular momentum (OAM) vortex beam optimization design. From the perspective of the radiation pattern’s power conservation principle, a correction factor is introduced to the conventional array factor of CUCA. Then, based on the improved array factor, by adjusting the rings’ radii parameters of the CUCA, we optimize the vortex beam’s sidelobe level through the generic algorithm (GA). Two different CUCA antenna model are calculated as examples to further illustrate the effectiveness of the improved array factor. Subsequently, an electromagnetic simulation model of two rings CUCA antenna is built at C band for generating low sidelobe vortex beam carrying OAM mode. The electromagnetic simulation model of the designed CUCA antenna is also fabricated and measured. The corresponding antenna far-field vortex beam radiation pattern and near-field vortex wave electric field distributions are measured. The simulation results and the measurement results are in good agreement. The proposed designs of antenna and OAM vortex beam regulation are expected to be used for 5G and 6G communications applications.
Author(s): Q. Feng, Y. Lin, Y. Zheng, L. Li
File Type: Journal Paper
Issue:Volume: 36      Number: 7      Year: 2021
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Title: VOLUME LOADING -- A NEW PRICIPLE FOR SMALL ANTENNAS
Abstract: Volume loading means placing conductively enclosed volumes at the ends of the arms of a short linear antenna to increase and control the capacitance of the structure. This technique allows tuning the antenna to make it series-resonant at a design frequency for which it is electrically small. This paper describes the discovery and development of the concept, gives some computed examples to illustrate the relation between shape and performance, and describes some experimental work, including a 900 MHx corless phone demonstration design.
Author(s): D.B. Miron, D.B. Miron
File Type: Journal Paper
Issue:Volume: 14      Number: 2      Year: 1999
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Title: Voltage Parameter Identification of AC Overhead Transmission Lines by Using Measured Electric Field Data
Abstract: With the development of smart power grids, the demand for real-time voltage monitoring along overhead transmission lines (OTLs) has been growing. However, the existing voltage measurement of OTLs by using potential transformers involves formidable difficulties. This study proposes a non-contact measurement method in which the voltages on AC OTLs are inversely calculated on the basis of the measured data of the power frequency electric field under OTLs. To improve the accuracy and stability of the inverse calculation, an accurate mathematical model and modified inverse algorithms are investigated and then a set of feasible approaches are proposed. First, considering an overhead conductor’s actual physical form and the meteorological conditions of its operating environment, a 3-D catenary model is built, and the mathematical relations between 3-D electric fields and the voltages on OTLs are identified. Second, the improved particle swarm algorithm is used to search the optimal measurement positions of the electric field to improve the ill-posedness of inverse problems. Third, the iterative Tikhonov regularization method, in which the number of iterations is considered as the variable, is adopted to further improve the ill-posedness of inverse problems and reduce the susceptibility of regular solutions to regularization parameter alpha. Fourth, root mean square values and phase parameters of AC voltages are identified from the sinusoidal fitting curves obtained by the real-time inverse calculation. Results of the simulation and experiment examples show that inverse solutions of high precision can be obtained under the condition with relatively high errors of electric field measurement. Moreover, the advantages of the proposed inversion method, such as fast computing speed and good stability, are demonstrated.
Author(s): D. Xiao, Q. Zheng, Y. Xie, Q. Ma, Z. Zhang
File Type: Journal Paper
Issue:Volume: 33      Number: 8      Year: 2018
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Title: Voltage and Current Analysis for Arcing Detection on AC Overhead Electrified Railways
File Type: Conference Paper
Issue:Volume: Numerical Techniques for Electromagnetic Applications      Number:      Year: 2011
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Title: Vivaldi Antenna for GPR
File Type: Conference Paper
Issue:Volume: Novel Antennas      Number:      Year: 2009
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Title: Visualizing Time-Domain Distributed Electromagnetic Fields Using Sonnet
File Type: Conference Paper
Issue:Volume: EM Applications in Sonnet      Number:      Year: 2012
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Title: Visualization of Electric Field Amplitudes inside Porous Spherical Cavity Resonators
File Type: Conference Paper
Issue:Volume: EM Applications using WIPL-D      Number:      Year: 2012
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Title: Virtual Source Modeling of the High-Frequency Scattering of the Infinite Conducting Strip under Cylindrical Wave Excitation
File Type: Conference Paper
Issue:Volume: Macromodeling for EMC and SI Complex Systems      Number:      Year: 2007
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Title: Virtual Design of Insulation Elements Based on FEM and Automated Optimization Process
File Type: Conference Paper
Issue:Volume: Hybrid CEM Techniques      Number:      Year: 2005
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Title: Vibration Isolation of Magnetic Suspended Platform with Double Closed-loop PID Control
Abstract: In magnetic vibration isolation field, magnetic force is used for the isolation, while the whole isolation system is always supported passively, which have non-control shortcomings. Aimed at this problem, a novel active control strategy with a double closed-loop PID algorithm was designed in this paper. The double closed-loop strategy includes an internal and external loop control, which was designed to fulfill the magnetic levitation and isolation, respectively. Firstly, the vibration isolation strategy proposed in this paper was simulated in both time and frequency domain. The simulation results showed that this method possesses good performance of vibration isolation. Then, an active levitation and vibration isolation control experiment was designed. The experimental results showed that the control algorithm has a good vibration control effect under periodic vibration and random vibration conditions.
Author(s): M. Tang, J. Zhou, C. Jin, Y. Xu
File Type: Journal Paper
Issue:Volume: 32      Number: 8      Year: 2017
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Title: Via Modeling in Multi-Gbits/s Signal Analysis
File Type: Conference Paper
Issue:Volume: Black Box Modeling      Number:      Year: 2004
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Title: VHF-UHF Monocone Antenna for Ground Penetrating Radar Application
Abstract: This paper introduces a VHF-UHF monocone antenna for ground penetrating radar GPR application. The proposed antenna covers different bandwidths through only changing the cone geometry. Same ground plane shape and feeding system are used. Firstly, both conventional and proposed monocone antennas are designed, simulated and their simulated results are compared. One antenna cone is fabricated and measured for verification purpose. Good agreement is obtained between measured and simulated bandwidths. The measured bandwidth extends from 73 MHz to 500 MHz. Secondly, another antenna cone is designed and simulated without altering the upper or the lower cone radii. The second cone antenna bandwidth extends from 130 MHz to 1000 MHz. The receiver antenna of the commercial SIR 2000 impulse GPR is replaced by the proposed VHF-UHF first monocone antenna and the field test results are recorded and discussed.
Author(s): T. G. Abouelnaga, E. A. Abdallah
File Type: Journal Paper
Issue:Volume: 34      Number: 5      Year: 2019
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Title: VHF Antennas on Unmanned Air Vehicles (UAV) for a Simplified Synthetic Aperture Radar (SAR)
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using FEKO      Number:      Year: 2011
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Title: VHF Antenna Modeling for Rocket Application
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling using FEKO – I      Number:      Year: 2008
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Title: VFD Approach to the Computation TE and TM Modes in Elliptic Waveguide on TM Grid
File Type: Conference Paper
Issue:Volume: Finite Difference Methods      Number:      Year: 2013
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Title: VFD Approach to the Computation TE and TM Modes in Elliptic Waveguide on TM Grid
Abstract: We describe here a vector finite difference approach (VFD) to the evaluation of eigenvalues and modes of elliptical waveguides. The FD is applied using a 2D elliptical grid in the waveguide section. A suitable Taylor expansion of the vector mode function allows to take exactly into account the boundary condition. To prevent the raising of spurious modes, our FD approximation results in a constrained eigenvalue problem, that we solve using a decomposition method. This approach has been evaluated comparing our results to known data for the elliptic case.
Author(s): A. Fanti, G. Montisci, G. Mazzarella, G. A. Casula
File Type: Journal Paper
Issue:Volume: 28      Number: 12      Year: 2013
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Title: Versatile Nanoparticle Manipulation with Designer Thermoplasmonic Metasurface
File Type: Conference Paper
Issue:Volume: S48 Computational Nanophotonics: Advanced Numerical Methods and Applications II      Number:      Year: 2018
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Title: VERIFYING WIRE-GRID MODEL INTEGRITY WITH PROGRAM 'CHECK'
Abstract: A wire-grid model of a complex surface such as an aircraft consists of hundreds of "vertex" points joined by hundreds of wires or "links". A wire antenna analysis program such as NEC is used to find the currents on the wires. The formulation within NEC imposes restrictions on the geometry of the wires, which limit the length of "segments" compared to the wavelength, the radius compared to the wavelength, the ratio of the segment length to the radius, and so forth. This paper collects these limitations together into a set of "modeling guidelines". The"integrity" of a wire-grid is its ability to represent the electrical behaviour of the continuous surface that it models. An important aspect of integrity is conformance to the "modeling guidelines". Gross errors creep into complex grids: repeated wires, omitted wires, wires of zero length. More subtle errors which violate the "modeling guidelines" can lead to incorrect current distributions and misleading radiated or scattered fields form the wire-grid when solved with the NEC code. This paper describes a program called CHECK which examines an input geometry file for the NEC program for conformance to the "modeling guidelines" by each individual wire, by wires forming junctions, and by pairs which do not join but are closely spaced. CHECK tabulates "notes", "warnings" and "errors" to aid the user in assessing the degree to which the model satisfies the guidelines. CHECK systematically finds all the guideline violations in a model. CHECK produces lists of wires for display with computer graphics to show the location of each type of problem that CHECK finds. The guideline violations found by CHECK inherently suggest improvements that can be made to the wire-grid. [Vol. 5, No. 2. pp. 17-42 (1990)]
Author(s): C. W. Trueman, S. J. Kubina, C. W. Trueman, S. J. Kubina
File Type: Journal Paper
Issue:Volume: 5      Number: 2      Year: 1990
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Title: Verifying Received Power Predictions of Wireless InSite Software in Indoor Environments at WLAN Frequencies
Abstract: This paper introduces a study on verifying received power at WLAN frequencies in indoor environments, Wireless InSite is a popular electromagnetic ray-tracing software which is widely used for predicting channel behaviour in indoor and outdoor environments. The study compares software-generated data with measurements collected through 3rd floor Chesham Building, University of Bradford, at WLAN frequencies, the paper also investigates the effect of changing settings on results accuracy and computational time, and finally, the paper presents a comparison between simulation results with empirical models.
Author(s): H. A. Obeidat, O. A. Obeidat, M. F. Mosleh, A. A. Abdullah, R. A. Abd-Alhameed
File Type: Journal Paper
Issue:Volume: 35      Number: 10      Year: 2020
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Title: Verify Microstrip Antenna Using Feature Selective Verification Method
File Type: Conference Paper
Issue:Volume: 4-3-B Antenna Design and Optimization Techniques I      Number:      Year: 2017
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Title: Verification Testing of Multi-Dynamical Solver for Multiferroic Antennas
File Type: Conference Paper
Issue:Volume: S42 Computational Methods      Number:      Year: 2021
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Title: Verification of the CADRCS RCS tool for NCTR work
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling, Inversion and Applications      Number:      Year: 2007
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Title: VERIFICATION OF SOFTWARES FOR ELECTROMAGNETIC FIELD ANALYSIS USING MODELS PROPOSED BY INVESTIGATION COMMITTEES IN IEE OF JAPAN
Abstract: In order to investigate methods for analyzing electromagnetic fields and to compare the accuracy and the CPU time of various codes and so on, investigation committees were set up in IEE of Japan. In this paper, the activities of various investigation committees relating electromagnetic field analysis are described from the viewpoint of the verification of software. [Vol. 12, No. 3 (1997), pp 50-61
Author(s): Norio Takahashi, Norio Takahashi
File Type: Journal Paper
Issue:Volume: 12      Number: 3      Year: 1997
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Title: Verification of Nonlinear Characteristics of Radar Angular Glint by Surrogate Data Method
Abstract: In this paper, we present a nontrivial verification of nonlinear characteristics of angular glint by the surrogate data method. Glint is a key cause of target loss in radar detections. Prediction and suppression of glint is a hot topic. Firstly, glint data of a typical target are calculated by GRECO method for two motions. As glint is calculated by quadric surface calculations, it is nonlinear in mathematical nature. The surrogate data method is explained and workflow is summarized to verify the nonlinear traits of glint. Surrogate methods of phase randomized Fourier transform and amplitude adjusted Fourier transform are illustrated. Test statistics of higher order moments and time reversibility are given. Lorenz model is simulated as a standard nonlinear model to verify effectiveness of workflow, and nonlinear verification criteria are drawn. A new parameter is designed to measure the powerfulness of nonlinearity. Finally, nonlinear verifications for the two angular glint series are given. Results are illustrated in figures and data and they agree with nonlinear criterion. This paper lays the foundations for chaotic verifications of glint.
Author(s): J. Zhang, Z. Li, C. zheng, J. Miao
File Type: Journal Paper
Issue:Volume: 28      Number: 10      Year: 2013
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Title: Vector Parabolic Equation Modeling of Wireless Propagation in Tunnels with Statistically Rough Surface Walls
File Type: Conference Paper
Issue:Volume: S59 Uncertainty Quantification and Modeling for Complex Applications      Number:      Year: 2018
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Title: Vector Parabolic Equation Modeling of Wireless Propagation in Tunnels with Statistically Rough Surface Walls
File Type: Conference Paper
Issue:Volume: S10 Student Paper Competition II      Number:      Year: 2018
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Title: Vector Parabolic Equation Method for the EM Scattering from PEC Objects in Half-Space
Abstract: The vector parabolic equation method was widely used to analyze the electromagnetic scattering from electrically large PEC objects in free space. In this paper, it is applied for the analysis of the electromagnetic scattering from PEC objects in halfspace. By introducing both the incident field and the reflected field to illuminate the objects, the vector parabolic equation method can be used to efficiently calculate the radar cross-section of PEC objects with electrically large size in half-space. The numerical results demonstrate that the proposed method can efficiently give reasonably accurate results.
Author(s): Z. He, T. Su, R. S. Chen
File Type: Journal Paper
Issue:Volume: 30      Number: 8      Year: 2015
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Title: Vector Hysteresis Modeling in Arbitrarily Shaped Objects Using an Energy Minimization Approach
Abstract: It is known that proper and efficient modeling of vector hysteresis is crucial to the precise design and performance estimation of electric power devices and magnetic recording processes. Recently, discrete Hopfield neural networks have been successfully utilized in the construction of vector hysteresis models. This paper presents a novel energy-minimization Hopfield neural network approach to implement Stoner-Wohlfarthlike vector hysteresis operators in triangular sub-regions. Advantages of the approach stem from the nonrectangular nature of such operators, which could mimic major hysteresis loops as well as their implementation in the most commonly used triangular discretization subdomains. Details of the approach are given in the paper.
Author(s): A. A. Adly, S. K. Abd-El-Hafiz
File Type: Journal Paper
Issue:Volume: 31      Number: 7      Year: 2016
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Title: Vector Control of PMSM Take Over by Photovoltaic Source
Abstract: This article established with the modeling and the field oriented control of permanent magnet synchronous machines, with a focus on their applications in variable speed domain in photovoltaic source.
Author(s): T. Yuvaraja, K. Ramya
File Type: Express Journal Paper
Issue:Volume: 1      Number: 6      Year: 2016
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Title: Vector Control of PMSM Take Over by Photovoltaic Source
Abstract: This article established with the modeling and the field oriented control of permanent magnet synchronous machines, with a focus on their applications in variable speed domain in photovoltaic source.
Author(s): T. Yuvaraja, K. Ramya
File Type: Journal Paper
Issue:Volume: 33      Number: 2      Year: 2018
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Title: Vector Control of PMSM Take Over by Photovoltaic Source
Abstract: This article established with the modeling and the field oriented control of permanent magnet synchronous machines, with a focus on their applications in variable speed domain in photovoltaic source.
Author(s): T. Yuvaraja, K. Ramya
File Type: Express Journal Paper
Issue:Volume: 33      Number: 2      Year: 2018
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Title: VARIOUS APPROACHES TO TORQUE CALCULATIONS BY FEM AND BEM
Abstract: Different algorithms for the torque calculation by Maxwell stress method (MSM) are dealt with in the paper. The aim of designing these algorithms was to reduce the influence of the choice of the integration path and discretization of the air gap between the stator and rotor on the accuracy of the results. In some of these algorithms the connection between the stator and rotor is released For the magnetic field calculation the finite element method (FEM), boundary element method (BEM), and hybrid finite element - boundary element method (HM) were used. The calculation results were tested on a permanent magnet DC motor and a single phase brushless motor. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 127-130]
Author(s): Mladen Trlep, Anton Hamler, Bozidar Hribernik, Mladen Trlep, Anton Hamler, Bozidar Hribernik
File Type: Journal Paper
Issue:Volume: 12      Number: 2      Year: 1997
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Title: Variational Analysis of Substrate-Integrated Waveguides with Longitudinal Slot
File Type: Conference Paper
Issue:Volume: S43 Advanced Applications I      Number:      Year: 2017
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Title: Variable Phase-Shifter/Down Converter for Active Microstrip Phased Array Antenna Applications
File Type: Conference Paper
Issue:Volume: Poster Sessions 1      Number:      Year: 2007
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Title: Validation, Verification and Calibration in Applied Computational Electromagnetics
Abstract: Model validation, data verification, and code calibration (VV&C) in applied computational electromagnetics is discussed. The step by step VV&C procedure is given systematically through canonical scenarios and examples. Propagation over flat-Earth with linearly decreasing vertical refractivity profile, having an analytical exact solution, is taken into account as the real-life problem. The parabolic wave equation (PWE) is considered as the mathematical model. MatLab-based numerical simulators for both the split step Fourier and finite element implementations of the PWE are developed. The simulators are calibrated against analytical exact and high frequency asymptotic solutions. Problems related to the generation of reference data during accurate numerical computations are presented.
Author(s): G. Apaydin, L. Sevgi
File Type: Journal Paper
Issue:Volume: 25      Number: 12      Year: 2010
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Title: Validation, Verification and Calibration in Applied Computational Electromagnetics
File Type: Conference Paper
Issue:Volume: CEM for EM Education      Number:      Year: 2010
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Title: VALIDATION OF, AND LIMITATIONS ON, THE USE OF NEC-4 FOR RADIATION FROM ANTENNAS BURIED WITHIN A HOMOGENEOUS HALF-SPACE
Abstract: The use of the computer program NEC-4 for the simulation of radiation from buried antennas is considered. NEC-4 uses the “exact” Sommerfield integral formulation for stratified media (in NEC-4, re-stricted to an homogeneous half-space). Although the formulation is rigorous, certain approximations have to be made for numerical implementation. The formu-lation, and some of these issues, is outlined in the paper. Several validation examples comparing results computed using NEC-4 and results available in the lit-erature are presented for antennas buried in various typical media, including ground, fresh water, and the sea. Satisfactory agreement has generally been obtained; where differences have been noted, we have able to explain most in terms of approximate implementa-tion issues.
Author(s): David B. Davidson, H. du Toit Mouton, David B. Davidson, H. du Toit Mouton
File Type: Journal Paper
Issue:Volume: 13      Number: 3      Year: 1998
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Title: VALIDATION OF THE NUMERICAL ELECTROMAGNETICS CODE (NEC) FOR ANTENNA WIRE ELEMENTS IN PROXIMITY TO EARTH
Abstract: This paper summarizes recent MITRE efforts to validate the NEC-3 and NEC-GS versions of the Numerical Electromagnetics Code (NEC) developed by Lawrence Livermore National Laboratory for predicting the performance of antenna wire elements in close proximity to flat earth. In an early version (NEC-l), the effect of the air-ground interface was included by applying a plane-wave Fresnel rei:lection coefficient approximation to the field of a point source. The NEC-2 version, while still retaining the Fresnel reflection coefficient model as an option, provides a more accurate ground model by numerically evaluating Sommerfeld integrals. The version NEC-3 extends the NEC-2 version to cases for bare wire segments below the air-earth interface. Version NEC-GS utilizes rotational symmetry to provide a more efficient version of NEC-3 for the case of a monopole element with a uniform radial wire ground-screen (GS). Results of the various versions are compared with each other and with other mndels. The input-output format of the NEC-GS version is discussed. It is concluded that the NEC-3 Sommerfeld integral option in the NEC-GS version is the best available model for monopole elements with electrically small radial-wire ground planes. [Vol. 8, No. 2 (1993), pp 44-71]
Author(s): M. M. Weiner, M. M. Weiner
File Type: Journal Paper
Issue:Volume: 8      Number: 2      Year: 1993
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Title: Validation of Fast Site-Specific Mean-Value Models for Indoor Propagation
Abstract: A fast assessment of the local mean value of the electric field strength throughout a floor plan is useful for the design of local-area networks. Site-specific models require coding the location of walls, doorways, and other features and modelling their structure and electrical properties. Using ray tracing to find the field strength throughout the floor plan is slow and expensive because a grid of closely-spaced points is needed to trace the rapid variations called fast fading; then the raytracing local area average is found by explicit spatial averaging, to obtain the slow fading behavior. The raytracing mean value is obtained by combining the amplitudes of the fields associated with the rays on an energy basis; widely-spaced grid points can be used because the local mean value varies slowly with position, making the calculation fast and inexpensive. The Sabine method provides a energy-balance approach for an inexpensive estimate of the local mean value field strength. This paper tests the accuracy of the fast methods (the ray-tracing mean value and the Sabine mean value) against the local area average found from dense ray tracing, and against measurements. In a 40 m2 room of roughly square floor plan, the fields from the fast methods were close to those of dense ray tracing and to the measurements. But it is shown that in a long corridor, the ray-tracing mean value and the Sabine mean value were low compared to dense ray tracing, and so these fast methods should be used with caution.
Author(s): C. W. Trueman, D. Davis, B. Segal, W. Muneer
File Type: Journal Paper
Issue:Volume: 24      Number: 3      Year: 2009
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Title: Validation of a Z-Matrix Finite Element Program for Analyzing Electrostatic Fields
Abstract: Modern electrical equipment designs demand more compact, complex geometries and require more strigent analyses of the associated three-dimensional electrostatic fields. Analytical solutions of such fields are limited to relatively simple geometries. Numerical solutions using the finite element method are limited by available computer storage and processing time. Lauber posed an economical method for solving three-dimensional finite element electrostatic fields by forming the finite element system matrix using Brown's Z-matrix techniques. (Lauber, 1982) (Brown, 1975) This method was implemented by a FORTRAN computer program. (Barber and Lauber, 1986) (Barber, 1988) The purpose of this paper is to briefly describe the present version of the program called FEWZ (Finite Elements using a Windown and the Z-matrix) and to show how it was validated.
Author(s): P.F. Barber, T.S. Lauber, E.D. Patterson, P.F. Barber, T.S. Lauber, E.D. Patterson
File Type: Journal Paper
Issue:Volume: 4      Number: 3      Year: 1989
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Title: VALIDATION AND DEMONSTRATION OF FREQUENCY APPROXIMATION METHODS FOR MODELING DISPERSIVE MEDIA IN FDTD
Abstract: Recently, digital signal processing techniques were used to design, analyze and implement discrete models of polarization dispersion for the Finite-Difference Time-Domain (FDTD) method. The goals of the present work are to illustrate the FDTD update equations for these techniques and to validate and demonstrate these techniques for one-dimensional problems involving reflections from dispersive dielectric half-spaces. Numerical results are compared with several other dispersive medial FDTD implementations.
Author(s): J.H. Beggs, J.H. Beggs
File Type: Journal Paper
Issue:Volume: 14      Number: 2      Year: 1999
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Title: Validating the Magnetostatic Frill Source with WIPL-D
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using Wipl-D      Number:      Year: 2011
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Title: Valence Electron High-harmonic Generation Analysis by the Finite Difference Time Domain Method
File Type: Conference Paper
Issue:Volume: 2-2-A Multiphysics Modeling and Simulation      Number:      Year: 2017
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Title: V-Band Frequency Reconfigurable Cavity-Based Bandpass Filters
File Type: Conference Paper
Issue:Volume: S55 Nanotechnology      Number:      Year: 2016
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Title: V Transmission lines Frequency Operation Band
File Type: Conference Paper
Issue:Volume: Microwave, Optical Devices, and Propagation      Number:      Year: 2007
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Title: UWB-MIMO Quadruple with FSS-Inspired Decoupling Structures and Defected Grounds
Abstract: In this paper, a quad element Ultra Wideband Multiple-Input Multiple-Output (UWB-MIMO) antenna system is presented. The proposed design is compact as it has four semielliptical shaped antennas along with the decoupling structures, fabricated on a compact substrate. The substrate employed is a low cost FR-4 laminate. The antenna elements are decoupled by employing Defected Ground Structures (DGS) and structures inspired from Frequency Selective Surfaces. An enhanced impedance match over lower to medium band is achieved by introducing dipole-like parasitic stubs on rear sides of the antennas. Measured results show that the isolation achieved by the proposed design is more than 20 dB over desired frequency band.
Author(s): T. Shabbir, R. Saleem, A. Akram, F. Shafique
File Type: Journal Paper
Issue:Volume: 30      Number: 2      Year: 2015
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Title: UWB Square Monopole Antenna with Omni-Directional Radiation Patterns for Use in Circular Cylindrical Microwave Imaging Systems
Abstract: In this paper, a novel ultra-wideband printed monopole antenna (PMA) for the use in a circular cylindrical microwave imaging system is presented. The proposed antenna consists of a square radiating patch and a ground plane with a pair of L-shaped slots and two L-shaped conductor back plane, which provides a wide usable fractional bandwidth of more than 130 % (3.02 GHz - 15.21 GHz). By cutting two modified Lshaped slots with variable dimensions on the ground plane corners and also by inserting two Lshaped conductor back plane on the other side of the substrate, additional resonances are excited and hence much wider impedance bandwidth can be produced, especially at the higher band. The proposed antenna has an ordinary square radiating patch, therefore displays a good omni-directional radiation pattern even at higher frequencies, and also its radiation efficiency is greater than 82% across the entire radiating band. The designed antenna has a small size of 12 × 18 mm2. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for circular cylindrical microwave imaging system.
Author(s): N. Ojaroudi, M. Ojaroudi, N. Ghadimi, M. Mehranpour
File Type: Journal Paper
Issue:Volume: 28      Number: 2      Year: 2013
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Title: UWB Slot Antenna with Band-Stop Operation by Using H-Shaped Parasitic Structures for UWB Applications
Abstract: A novel ultra wideband (UWB) printed slot antenna with band-notched performance is designed and manufactured. In order to increase the impedance bandwidth of the slot antenna, we use a rectangular slot with an H-shaped parasitic structure inside the rectangular slot on the feedline that with this structure UWB frequency range can be achieved. Additionally, by using a square ring radiating stub with a rotated H-shaped parasitic structure inside the square ring, a frequency band-stop performance has been obtained. The designed antenna has a small size of 20 × 20 mm2 while showing the radiation performance in the frequency band of 2.97 GHz to over 12.39 GHz with a band rejection performance in the frequency band of 5.01 GHz to 5.98 GHz. Simulated and experimental results obtained for this antenna show that it exhibits good radiation behavior within the UWB frequency range.
Author(s): M. Ojaroudi, N. Ojaroudi, N. Ghadimi
File Type: Journal Paper
Issue:Volume: 28      Number: 12      Year: 2013
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Title: UWB Slot Antenna with Band-Notched Property with Time Domain Modeling based on Genetic Algorithm Optimization
Abstract: This paper presents a kind of band-notched slot antenna with time domain designing method for ultra-wideband (UWB) applications. The proposed antenna consists of a square radiating stub with a defected mircostrip feed-line using an M-shaped step impedance resonator (SIR) slot and a defected ground plane with a pair of inverted U-shaped slots. By cutting two inverted U-shaped slots in the ground plane, a new resonance at the higher frequencies is excited and hence much wider impedance bandwidth can be produced that. To generate a band-notched characteristic, we use an M-shaped slot at the feed-line. The proposed antenna can operate from 3.03 to 13.21 GHz with frequency band-notched function in 7.28-7.79 GHz to avoid interference from downlink of X-band satellite communication systems. To verify the validation of the proposed antenna an equivalent circuit based on time domain reflectometry (TDR) analysis is presented. In addition, the accuracy of the equivalent circuit models have been improved using Genetic algorithm optimization (GAP). Detailed simulation and numerical investigations are conducted to understand their behaviors and optimize for broadband operation. The proposed antenna exhibits almost omni-directional radiation patterns in UWB frequency range and could be used in wireless systems.
Author(s): J. Zolghadr, Y. Cai, N. Ojaroudi
File Type: Journal Paper
Issue:Volume: 31      Number: 8      Year: 2016
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Title: UWB Monopole Antenna with WLAN Frequency Band-Notched Performance by using a Pair of E-Shaped Slits
Abstract: In this paper an ultra-wideband monopole antenna with frequency band-stop performance is designed and manufactured. The proposed antenna consists of square radiating patch with two E-shaped slits and a ground plane with a protruded T-shaped strip inside the rectangular slot. In the proposed structure, by inserting a rectangular slot with a T-shaped strip protruded inside the slot on the ground plane, additional resonance is excited and hence, much wider impedance bandwidth can be produced, especially at the higher band. In order to create band-rejected function we use two E-shaped slits in the square radiating patch. The fabricated antenna has the frequency band of 3 GHz to over 12.7 GHz with a rejection band around 5 GHz – 6 GHz. Good VSWR and radiation pattern characteristics are obtained in the frequency band of interest. Simulated and measured results are presented to validate the usefulness of the proposed antenna structure for UWB applications
Author(s): N. Ojaroudi, M. Ojaroudi, N. Ghadimi
File Type: Journal Paper
Issue:Volume: 28      Number: 12      Year: 2013
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Title: UWB Monopole Antenna with Switchable Band-Notch Characteristic Using a Novel MEMS Afloat
Abstract: In this paper, a novel microelectro-mechanical system (MEMS) U-shaped afloat is designed and used instead of a simple slot to activate and deactivate the band notch characteristic of an ultra wideband (UWB) monopole antenna at the WLAN band (5.15-5.825 GHz) without extra DC bias lines. The novelty of this work is design of MEMS afloat that can stay in down state permanently. When the dc actuation voltage, about 20 volts, is applied to the microstrip center line, the ?/2 long U-shaped afloat moves down and creates a slot (resonating element) in its vacant place. Whereas no voltage is applied, the afloat remains in the up position and serves as a part of the antenna, which eliminates the resonance. The proposed design for MEMS afloat has least negative effect on gain, reflection coefficient, and pattern of the antenna. The gain of the antenna is about 3.2 dBi over the entire UWB frequency band (3.1-10.6 GHz), while it decreases sharply over 7 dB at the rejection band. More-over, the time-domain characteristics of the antenna is investigated, which shows 1 ns delay over the UWB frequency band for 20 cm. Due to a novel afloat design, the addition of the resonance element does not affect on the radiation performance, reflection coefficient, gain, and group delay of the antenna outside of notched band frequencies.
Author(s): A. Nemati, B. A. Ganji
File Type: Journal Paper
Issue:Volume: 30      Number: 12      Year: 2015
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Title: UWB Monopole Antenna with Dual Band-Stop Performance Using G-Shaped SRR and SIR Structures at Feed Line
Abstract: This article presents a new design of ultra-wideband monopole antenna with the characteristics of dual band rejection .The antenna consists of a circular radiating patch, a feed-line with G-shaped Step-Impedance Resonator (SIR) slot and Split-Ring Resonator (SRR) structure, and a ground plane which provides a wide usable fractional bandwidth of more than 120% with two notch bands around 5.15-5.35 GHz and 7.25-7.75 GHz, to avoid interferences from High Performance Radio Local Area Networks (HIPERLAN) and downlink frequency of X-band satellite systems. The simulated and measured results show that the antenna design exhibits an operating bandwidth (VSWR<2) from 2.86 to 12.92 GHz, excluding the rejected bands. The proposed antenna configuration is simple, easy to fabricate and can be integrated into any UWB system. The antenna has an ordinary circular-disc radiating patch, therefore displays good omnidirectional radiation patterns, even at higher frequencies.
Author(s): S. Ojaroudi, Y. Ojaroudi, N. Ghadimi, N. Ojaroudi
File Type: Journal Paper
Issue:Volume: 29      Number: 10      Year: 2014
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Title: UWB Monopole Antenna with Dual Band-Notched Function
Abstract: In this letter, an Ultra-Wideband (UWB) monopole antenna with dual frequency band-stop performance is designed and manufactured. In the proposed structure, by inserting an S-shaped parasitic structure inside a square slot in the ground plane a new resonance at higher frequencies can be achieved, which provides a wide usable fractional bandwidth of more than 125%. In order to generate dual bandnotched function, we use four L-shaped strips protruded inside square ring. The measured results reveal that the antenna offers a very wide bandwidth from 2.63 to 14.2 GHz with two notched bands covering all the 5.2/5.8 GHz WLAN, 3.5/5.5 GHz WiMAX and 4 GHz C bands. Good VSWR and radiation pattern characteristics are obtained in the frequency band of interest.
Author(s): Y. Ojaroudi, S. Ojaroudi, N. Ojaroudi
File Type: Journal Paper
Issue:Volume: 30      Number: 2      Year: 2015
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Title: UWB MIMO Antenna with Decoupling Strip for 5G Applications
File Type: Conference Paper
Issue:Volume: S47 Advanced Antenna Designs for Emerging Wireless Applications      Number:      Year: 2021
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Title: UWB Microstrip-Fed Slot Antenna with Band-Rejection Performance Using an SRR Conductor-Backed Plane
Abstract: In this article, a novel and compact ultra-wideband (UWB) slot antenna with bandnotched function is presented. This antenna consist of a square radiating stub, a 50? microstrip feedline, a ground plane with a pair of rotated Tshaped strips protruded inside square slots and a Split Ring Resonator (SRR) conductor-backed plane. In this design, by cutting a pair of modified square slots with rotated T-shaped strips protruded inside slots, additional resonance is excited and hence much wider impedance bandwidth can be produced. In order to achieve a band-notched function, an SRR parasitic structure was inserted in the ground plane. The measured results show that the proposed antenna can achieve the Voltage Standing Wave Ratio (VSWR) requirement of less than 2.0 in frequency range from 3.1 GHz to 13.15 GHz, with band-rejection performance of 5.08 GHz to 6 GHz, to avoid interference from WLAN communications. The presented microstrip-fed slot antenna exhibits good radiation behavior. The antenna has a small size.
Author(s): N. Ojaroudi, N. Ghadimi, Y. Ojaroudi
File Type: Journal Paper
Issue:Volume: 29      Number: 3      Year: 2014
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Title: UWB Gain Enhancement of Horn Antennas Using Miniaturized Frequency Selective Surface
Abstract: In this work, enhancement of the radiation performances of horn antennas are worked out within their operation bandwidth by placing the miniaturized Frequency Selective Surface (FSS)s perpendicularly into the inner part of their flares. Here each FSS consists of only a single miniaturized double-sided inverted Tshaped square unit cell designed on the low-cost FR4 with relative permittivity 4.4, loss tangent 0.0035 and thickness 1.58 mm in 3D CST environment so that it is able to focus the propagating electromagnetic waves to increase the directivity properties like a dielectric lens, while keeping the mismatching characteristics with less size and low manufacturing cost compared to its counter parts. Herein an exponentially tapered TEM horn with the operation bandwidth of 5-13 GHz is taken as an example horn antenna for measurements. From the measured results of the prototyped module, it can be observed that the proposed module keep mismatching characteristics of the horn antenna, meanwhile the gain and beam widths are enhanced to amplify the signal in the operation band without any increase in the total volume of the module or making the design bulky. Thus, it is expected that this methodology can be implemented to horn antennas effectively reducing volume and cost of communication systems.
Author(s): M. A. Belen, F. Gunes, P. Mahouti, A. Belen
File Type: Journal Paper
Issue:Volume: 33      Number: 9      Year: 2018
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Title: UWB Compact TEM Ridged Horn Antenna
File Type: Conference Paper
Issue:Volume: Application of Electromagnetic Simulation for Designing and Analysis of Antennas and Radio Propagations Part I      Number:      Year: 2014
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Title: Utilizing Hybrid Dielectric-Metal and Mesh Refinement Techniques When Modeling a MMIC in Concerto Quickwave
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling with QuickWave/Concerto      Number:      Year: 2008
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Title: Utilization of Protruded Strip Resonators to Design a Compact UWB Antenna with WiMAX and WLAN Notch Bands
Abstract: In this paper, a new design of ultrawideband (UWB) microstrip monopole antenna is presented. The main novelty of the proposed structure is the using of protruded strips as resonators to design an UWB antenna with dual band-stop property. In the proposed design, by cutting the rectangular slot with a pair of rotated Y-shaped strips in the ground plane, additional resonance is excited and much wider impedance bandwidth can be achieved. To make a single band-notched function, the square radiating patch is converted to the square-ring structure with a pair of protruded fork-shaped strips. Finally, by cutting a rectangular slot with a protruded M-shaped strip at the feed line, a desired dual band-notched function is achieved. The measured results reveal that the presented dual band-notched antenna offers a very wide bandwidth from 2.8 to 11.6 GHz, with two notched bands, around of 3.3-3.7 GHz and 5-6 GHz covering all WiMAX and WLAN bands.
Author(s): J. Mazloum, N. Ojaroudi
File Type: Journal Paper
Issue:Volume: 31      Number: 2      Year: 2016
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Title: UTD Shooting-and-Bouncing Extension to a PO/PTD Ray Tracing Algorithm
Abstract: This paper deals with the efficient combination of three well-established electromagnetic modeling methods, a Shooting-and-Bouncing-Rays (SBR) algorithm on the basis of the Geometrical Optics (GO), a source-based calculation of scattered field strengths using Physical Optics (PO) and Physical Theory of Diffraction (PTD), and diffraction calculation on the basis of the Uniform Theory of Diffraction (UTD). While the conventional GO-PO/PTD methods are able to accurately calculate wedge contributions to scattered fields, the further propagation of diffracted rays is generally not considered in SBR approaches. Thus, the aim of this paper is to describe the implementation of diffracted rays according to the UTD concept into an SBR code. This novel implementation allows for the modeling of double diffraction and reflected-diffractedreflected paths in complex scenarios consisting of a very large number of surface elements as well as the accurate simulation of cavities. The comparison with numerically exact reference simulations proves that the proposed hybrid GO/UTD-PO/PTD algorithm yields excellent results and that the UTD-SBR extension definitely improves the simulations of the ray tracing algorithm also for realistic objects.
Author(s): F. Weinmann
File Type: Journal Paper
Issue:Volume: 24      Number: 3      Year: 2009
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Title: UTD Ray and Beam Methods for Analysis of Large EM Wave Problems Abstract
File Type: Tutorial Abstract
Issue:Volume: S35 UTD Ray and Beam Methods for Analysis of Large EM Wave Problems      Number:      Year: 2015
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Title: Using YATPAC for Modeling of a Marchand Balun
File Type: Conference Paper
Issue:Volume: MEFiSTo Modeling and Analysis      Number:      Year: 2007
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Title: Using Transfer Function Approach To Develop MRI Visible and Low RF Heating Sleeve for Cardiac Applicaion
File Type: Conference Paper
Issue:Volume: S54 Computational Electromagnetic Modeling in EMC Applications      Number:      Year: 2016
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Title: Using Time-domain Codes to Find RF Cavity Eigenmodes
File Type: Conference Paper
Issue:Volume: Advances in Finite Difference Time Domain      Number:      Year: 2009
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Title: Using System-Theoretical Consideration for Calculating Coupling Effects in Packages
File Type: Conference Paper
Issue:Volume: Advances in CEM Applications I      Number:      Year: 2012
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Title: Using Superformula to Miniaturize CPW Rat Race Coupler
Abstract: This paper proposes a new CPW rat race coupler whose shape has been meandered using the superformula for size reduction. The coupler operates at a center frequency of 1.8 GHz. The size reduction in the proposed design is about 74% as compared to conventional ring rat race coupler. The bandwidth of the proposed coupler defined by |S11| < -15 dB is about 31.6%.
Author(s): A. A. Omar, N. I. Dib
File Type: Journal Paper
Issue:Volume: 33      Number: 12      Year: 2018
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Title: USING NONUNIFORM SEGMENTS LENGTHS WITH NEC TO ANALYZE ELECTRICALLY LONG WIRE ANTENNAS
Abstract: In this paper an electrically long monopole is analyzed using the Numerical Electromagnetics Code, version two (NEC-2). Due to the electrical length of the monopole and the segment length requirement established for the NEC-2 program, the computer memory requirement and computational time become excessive. By successively increasing the segment length with distance from the source, very large structures can be analyzed accurately and efficiently. Various schemes for selecting the segment lengths are considered, and the results are compared to those obtained by using a large number of electrically short segments. This technique of grading segment lengths allows one to employ NEC-2 to analyze other electrically long wire antennas. [Vol. 5, No. 2, pp. 2-16 (l990)]
Author(s): Saad N. Tabet, J. Patrick Donohoe, Clayborne D. Taylor, Saad N. Tabet, J. Patrick Donohoe, Clayborne D. Taylor
File Type: Journal Paper
Issue:Volume: 5      Number: 2      Year: 1990
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Title: Using Near Field Equivalent Sources in Combination with Large Element Physical Optics to Model a Slant 45 Degree Omni Directional Antenna over Ground
File Type: Conference Paper
Issue:Volume: S03 EM Modeling using Feko/WinProp      Number:      Year: 2020
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Title: Using Near Field Equivalent Sources in Combination with Large Element Physical Optics to Model a Slant 45 Degree Omni Directional Antenna over Ground
Abstract: This paper compares the theoretical and measured antenna patterns of a slant 45-degree antenna on a rolled edge ground plane. Advantages of using sampled nearfield currents in combination with large element physical optics in determining the reflected far fields will be described.
Author(s): K. Snyder
File Type: Journal Paper
Issue:Volume: 35      Number: 11      Year: 2020
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Title: Using MATLAB’s Parallel Processing Toolbox for Multi-CPU and Multi-GPU Accelerated FDTD Simulations
Abstract: MATLAB is a good testbed for prototyping new FDTD techniques as it provides quick programming, debugging and visualization capabilities compared to lower level languages such as C or FORTRAN. However, the major disadvantage of using MATLAB is its slow execution. For faster simulations, one should use other programming languages like Fortran or C with CUDA when utilizing graphics processing units. Development of simulation codes using these other programming languages is not as easy as when using MATLAB. Thus the main objective of this paper is to investigate ways to increase the throughput of a fully functional finite difference time domain method coded in MATLAB to be able to simulate practical problems with visualization capabilities in reasonable time. We present simple ways to improve the efficiency of MATLAB simulations using the parallel toolbox along with the multi-core central processing units (CPUs) or the multiple graphics processing units (GPUs). Native and simple MATLAB constructs with no external dependencies or libraries and no expensive or complicated hardware acceleration units are used in the present development.
Author(s): A. J. Weiss, A. Z. Elsherbeni, V. Demir, M. F. Hadi
File Type: Journal Paper
Issue:Volume: 34      Number: 5      Year: 2019
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Title: Using MATLAB to Model Inhomogeneous Media in Commercial Computational Electromagnetics Software
Abstract: This paper presents a new method to model inhomogeneous media in commercial electromagnetics software, especially FEKO. In this method, the inhomogeneous medium is fragmented to some homogeneous pieces. If the size of these pieces is chosen correctly, then the electromagnetic behaviors of them and inhomogeneous medium are the same. Since creating these homogeneous pieces in FEKO manually is very difficult and time consuming, MATLAB is employed to create these pieces in FEKO.
Author(s): A. Farahbakhsh, D. Zarifi, A. Abdolali
File Type: Journal Paper
Issue:Volume: 30      Number: 9      Year: 2015
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Title: Using MATLAB to Control Commercial Computational Electromagnetics Software
Abstract: This paper provides details on how to use MATLAB to control some commercial electromagnetics software packages. FEKO is an example that can be directly called from MATLAB. Other commercial software, such as CST Microwave Studio and Ansoft HFSS, require a scripting language interface. An example of a design of an inset rectangular patch antenna is presented using a direct call to FEKO and a Visual Basic for Applications interface to CST Microwave Studio are presented.
Author(s): R. L. Haupt, R. L. Haupt
File Type: Journal Paper
Issue:Volume: 23      Number: 1      Year: 2008
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Title: Using Logo-Antenna Based RFID Tags forAdvertising
File Type: Conference Paper
Issue:Volume: Modeling of RFID Devices and Systems      Number:      Year: 2009
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Title: Using Logo-Antenna Based RFID Tags for Advertising
File Type: Conference Paper
Issue:Volume: Student Paper Competition I      Number:      Year: 2009
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Title: Using GPUs for Accelerating Electromagnetic Simulations
Abstract: The computational power and memory bandwidth of graphics processing units (GPUs) have turned them into attractive platforms for general-purpose applications at significant speed gains versus their CPU counterparts [1]. In addition, an increasing number of today's state-ofthe- art supercomputers include commodity GPUs to bring us unprecedented levels of performance in terms of raw GFLOPS and GFLOPS/cost. Inspired by the latest trends and developments in GPUs, we propose a new paradigm for implementing on GPUs some of the major aspects of electromagnetic simulations, a domain traditionally used as a benchmark to run codes in some of the most expensive and powerful supercomputers worldwide. After reviewing related achievements and ongoing projects, we provide a guideline to exploit SIMD parallelism and high memory bandwidth using the CUDA programming model and hardware architecture offered by Nvidia graphics cards at an affordable cost. As a result, performance gains of several orders of magnitude can be attained versus threadlevel methods like pthreads used to run those simulations on emerging multicore architectures
Author(s): M. Ujaldon
File Type: Journal Paper
Issue:Volume: 25      Number: 4      Year: 2010
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Title: Using Folded Open-Loop Ring Resonator to Design a Common-Mode Suppression and Frequency Adjustable Balun-Bandpass Filter
Abstract: A compact and simple balun-bandpass filter was investigated by using a pair of half-wavelength open-loop ring resonators (OLRRs) and two microstrip lines. The balun-bandpass filter could be designed easily with a different center frequency by changing the path length of OLLRRs. The design methodology was adopted based on EM simulation to obtain these optimally designed parameters of the OLRRs, and microstrip lines and the filters were fabricated on FR4 substrate. The filters with the frequencies of 2.6 GHz and 5.2 GHz were designed to prove the characteristic of frequency adjustable and they were fabricated with the properties of wide bandwidth and low insertion loss. The balun-bandpass filters presented an excellent inband balanced performance with common-mode rejection ratio over than 40 dB and 34 dB in the passbands of 2.6 GHz and 5.2 GHz, respectively. Good correlation was seen between simulation and measurement, and the result showed that first run pass had been achieved in the majority of our design.
Author(s): C.-M. Chen, S.-J. Chang, J.-C. Zheng, J.-C. Liou, C.-F. Yang
File Type: Journal Paper
Issue:Volume: 31      Number: 1      Year: 2016
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Title: Using FEKO Software for Analysis of Radiated Electric Field by Power Converters
File Type: Conference Paper
Issue:Volume: FEKO Modeling and Analysis - 2      Number:      Year: 2006
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Title: Using FEKO for Electromagnetic Analysis of Carbon-Fiber Composite Structures
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using FEKO      Number:      Year: 2011
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Title: Using Electromagnetic Band Gap (EBG) Superstrate Layer to Enhance the Bandwidth and Gain of a Dual Band Microstrip Patch Antenna
File Type: Conference Paper
Issue:Volume: Metamaterial Structures with Application to Guided-Wave Electromagnetics and Antennas      Number:      Year: 2007
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Title: Using Circuit Simulation Optimization to Determine the Electrical Properties of Polymeric Composite Materials
File Type: Conference Paper
Issue:Volume: Computational Methods for Nondestructive Evaluation and Materials Characterization      Number:      Year: 2007
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Title: Using an Approximate Streamline Upwind/Petrov-Galerkin Stabilization Matrix for the Solution of Maxwell’s Equations in Dispersive Materials
File Type: Conference Paper
Issue:Volume: S17 Time Domain Methods I      Number:      Year: 2018
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Title: Using Adaptive Estimation to Minimize the Number of Samples Needed to Develop a Pattern to a Specified Uncertainty
Abstract: Obtaining far-field patterns in electromagnetics or acoustics, although generally not as computationally expensive as solving for the sources induced on an object, can none-the-less at times be a substantial fraction of the overall computer time associated with some problems. This can be especially the case in determining the monostatic radar cross section of large objects, since the current distribution must be computed for each incidence angle or when using physical optics to determine the radiation patterns of large reflector antennas. In addition, when employing the point sampling and linear interpolation of the far field that is most often used to develop such patterns, it can be necessary to sample very finely in angle to avoid missing fine details such as nulls. A procedure based on model-based parameter estimation is described here that offers the opportunity of reducing the number of samples needed while developing an easily computed and continuous representation of the pattern. It employs windowed, low-order, overlapping fitting models whose parameters are estimated from the sparsely sampled far-field values. The fitting models themselves employ either discrete-source approximations to the radiating currents or Fourier models of the far field. For the cases investigated, as few as 1.5 to 2 samples per far-field lobe are found to be sufficient to develop a radiation-pattern estimate that is accurate to 0.1 dB, and 2.5 samples per lobe for a simple scatterer. In general, however, the sampling density is not determined by the lobe count alone, but by the effective rank of the field over the observation window, which in turn is a function of both the aperture size and the spatial variation of the source distribution within that aperture.
Author(s): Edmund K. Miller, Edmund K. Miller
File Type: Journal Paper
Issue:Volume: 17      Number: 3      Year: 2002
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Title: Using Adaptive Cross Approximation for Efficient Calculation of Monostatic Scattering with Multiple Incident Angles
Abstract: An adaptive cross approximation (ACA) based method is proposed for the fast analysis of the monostatic radar cross-section (RCS). Using the low-rank property, several largest eigenvalues and corresponding eigenvectors of the multiple right hand sides can be computed and saved efficiently by the ACA algorithm. The iterative solution of linear equations is required at these principle eigenvectors. Compared with solving linear equations at each angle repeatedly, the proposed method is able to greatly reduce the computation time. In order to efficiently solve the linear equations, the flexible general minimal residual (FGMRES) iterative solver is applied to compute the coefficients of Rao-Wilton-Glisson (RWG) basis functions. Numerical results demonstrate that the proposed method is efficient for monostatic RCS calculation with high accuracy.
Author(s): Z. Liu, R. Chen, J. Chen, Z. Fan
File Type: Journal Paper
Issue:Volume: 26      Number: 4      Year: 2011
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Title: POINT-MATCHED TIME DOMAIN FINITE ELEMENT METHOD APPLIED TO MULTI-CONDUCTOR ELECTROMAGNETIC TRANSIENTS ANALYSIS.
Abstract: A point-matched time domain finite element method (TDFE) applied to the analysis of electromagnetic transients in multi-conductor transmission line network is presented. The TDFE method solves the partial differential transmission line equations based on a semi-discrete approximation using the finite element method and leap-frog scheme. Some oscillations can occur due to the stability condition of the technique. Using the modal analysis these oscillations can be eliminated. A surge propagation in a simple multi-conductor network is presented and the results are compared with the Electromagnetic Transients Program (EMTP) simulations. [Vol. 12, No. 1 (1997), Special Issue on International Computational Electromagnetics, pp 39-43]
Author(s): Glassio Costa de Miranda, Glassio Costa de Miranda
File Type: Journal Paper
Issue:Volume: 12      Number: 1      Year: 1997
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Title: SELF ADAPTIVE FUZZY SETS IN MULTI OBJECTIVE OPTIMIZATION USING GENETIC ALGORITHMS
Abstract: Optimization in electrical engineering has attracted an increasing attention over the last few years. Various strategies to solve electromagnetic optimization problems have been introduced, amongst them stochastic, deterministic and hybrid ones. Most of today's real world applications, however, involve multiple conflicting objectives which should be considered simultaneously. The aim of this paper is to introduce self adaptive fuzzy sets to treat vector optimization problems. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 26-31]
Author(s): Ch. Magele, G. Furntratt, B. Brandstatter, K.R. Richter, Ch. Magele, G. Furntratt, B. Brandstatter, K.R. Richter
File Type: Journal Paper
Issue:Volume: 12      Number: 2      Year: 1997
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Title: OPTIMIZATION OF A SMES DEVICE UNDER NONLINEAR CONSTRAINTS
Abstract: In this paper a method to calculate the gradients for the TEAM 22 problem is presented. Furthermore an objective function different from the one proposed in the benchmark is used where the energy requirement was handled as an equality constraint. The so derived gradients of the objective function and the constraints together with a standard optimization routine are used to solve the problem. In the last section some new results concerning the presence of local minima for the problem are given. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 50-53]
Author(s): B. R. Brandstatter, Wolfgang Ring, B. R. Brandstatter, Wolfgang Ring
File Type: Journal Paper
Issue:Volume: 12      Number: 2      Year: 1997
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Title: A STRONG COUPLING MODEL FOR THE SIMULATION OF MAGNETOMECHANICAL SYSTEMS USING A PREDICTOR/MULTI-CORRECTOR ALGORITHM
Abstract: A recently developed modeling scheme for the numerical simulation of coupled magnetomechanical systems is presented. The scheme allows the calculation of dynamic rigid motions as well as deformations of magnetic and anti-magnetic materials in a magnetic field. The equations governing the magnetic and mechanical field quantities are solved using a combined Finite Element /Boundary-Element-Method (FEM-BEM). To circumvent the nonlinear system of equations resulting from a direct coupling of the magnetic and mechanical systems, the calculation of the magnetic forces is based on predictor values of the magnetic quantities. Therewith, a decoupling into a magnetic and mechanical matrix equation can be achieved. To ensure the strong coupling between the magnetic and mechanical quantities, a sophisticated Predictor/Multicorrector Algorithm is used resulting in an efficient iteration between the two matrix equations within a single time step. Computer simulations of an electromagnetic forming system and a magnetomechanical transducer immersed in an acoustic fluid (acoustic power source) show good agreement between simulation results and measured data. [Vol. 12, No. 2 (1997), Special Issue on Numerical Field Calculations in Electrical Engineering, pp 102-106]
Author(s): M. Kaltenbacher, H. Landes, R. Lerch, M. Kaltenbacher, H. Landes, R. Lerch
File Type: Journal Paper
Issue:Volume: 12      Number: 2      Year: 1997
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Title: CALCULATION OF ELECTROMAGNETIC SCATTERING VIA VARIATIONS AND ANALYTIC CONTINUATION
Abstract: In this paper we review a numerical method we introduced recently for the solution of problems of electromagnetic scattering. Based on variations of the boundaries of the scatterers and analytic continuation, our approach yields algorithms which are applicable to a wide variety of scattering configurations. We discuss some recent applications of this method to scattering by diffraction gratings and by large two-dimensional bounded bodies, and we present results of new applications to three-dimensional gratings containing corners and edges. In many cases of practical interest our algorithms give nu- merical results which are several orders of magnitude more accurate than those given by classical methods. [Vol. 11, No. 1 (1996), pp 17- 31, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics]
Author(s): Oscar P. Bruno, Fernando Reitich, Oscar P. Bruno, Fernando Reitich
File Type: Journal Paper
Issue:Volume: 11      Number: 1      Year: 1996
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Title: MONO-STATIC RCS COMPUTATION WITH A BLOCK GMRES ITERATIVE SOLVER
Abstract: We present a new method of computing mono-static radar cross sections using a preconditioned Block GMRES iterative algorithm. The convergence properties of this algorithm are analyzed using RCS error, equation residual error and solution error. It is found that this method is nearly an order of magnitude faster than direct methods (LINPACK) for realistic method of moment problems. [Vol. 11, No. 1 (1996), pp 63-69, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics]
Author(s): William E. Boyse, Andrew A. Seidl, William E. Boyse, Andrew A. Seidl
File Type: Journal Paper
Issue:Volume: 11      Number: 1      Year: 1996
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Title: MODERN KRYLOV SUBSPACE METHODS IN ELECTROMAGNETIC FIELD COMPUTATION USING THE FINITE INTEGRATION THEORY
Abstract: A theoretical basis for numerical electromagnetics, the so-called Finite Integration Theory, is described. Based upon Maxwell's equations in their integral form, it results in a set of matrix equations, each of which is a discrete analogue of its original analytical equation. Applications of this discretization process are described here in the context of the numerical simulation of electroquasistatic problems and of time-harmonic field computations including a new type of waveguide boundary condition, which is presented here for the first time. In both fields the process of mathematical modelling and discretization yields large systems of complex linear equations which have to be solved numerically. For this task several modern Krylov subspace methods are presented such as BiCG, CGS and their more recent stabilized variants CGS2, BiCGSTAB(I) and TFQMR. They are applied in connection with efficient preconditioning methods. The applicability of these modern methods is shown for a number of examples for both problem types. [Vol. 11, No. 1 (1996), pp 70-84, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics]
Author(s): Markus Clemens, Rolf Schuhmann, Ursula van Rienen, Thomas Weiland, Markus Clemens, Rolf Schuhmann, Ursula van Rienen, Thomas Weiland
File Type: Journal Paper
Issue:Volume: 11      Number: 1      Year: 1996
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Title: FINITE DIFFERENCE METHODS FOR THE NONLINEAR EQUATIONS OF PERTURBED GEOMETRICAL OPTICS
Abstract: Finite difference methods are developed to solve the nonlinear partial differential equations approximating solutions of the Helmholtz equation in high frequency regime. Numerical methods are developed for solving the geometrical optics approximation, the classical asymptotic expansion, and a new perturbed geometrical optics system. We propose a perturbed geometrical optics system to recover diffraction phenomena that are lost in geometrical optics approximations. We discuss techniques we have developed for recovering multivalued solutions and we present numerical examples computed with finite difference approximations of the above systems. [Vol. 11, No. 1 (1996), pp 90-98, Special issue on Applied Mathematics: Meeting the challenges presented by computational electromagnetics]
Author(s): E. Fatemi, B. Engquist, and S. Osher, E. Fatemi, B. Engquist, and S. Osher
File Type: Journal Paper
Issue:Volume: 11      Number: 1      Year: 1996
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Title: A GUIDE TO IMPLEMENTATIONAL ASPECTS OF THE SPATIAL DOMAIN INTEGRAL EQUATION ANALYSIS OF MICROSTRIP ANTENNAS
Abstract: In the analysis of microstrip radiating structures integral equation methods rate among the more accurate approaches. By far the most demanding part in the use of these methods is the actual numerical implementation. This paper presents a detailed illustrated description of the numerical implementation of a spatial domain mixed-potential integral equation analysis of microstrip radiating structures. [Vol. 10, No. 1 (1995), pp 40-51]
Author(s): Louis T. Hildebrand, Derek A. McNamara, Louis T. Hildebrand, Derek A. McNamara
File Type: Journal Paper
Issue:Volume: 10      Number: 1      Year: 1995
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Title: MUTUAL VALIDATION OF THREE PROGRAMS FOR NUMERIC ANTENNA COMPUTATIONS
Abstract: The numerical results obtained by three different codes, GALNEC, WARAN and NEC-2 are compared for thin dipoles and thick ones with hemispherical end caps and for arrays of such collinear dipoles. The electric field integral equation and Galerkin's method are used in the code GALNEC where solid thick dipole bodies are implemented. Mei's (1965) integral equation and collocation technique are wed in the code WARAN, where thick dipoles are simulated as arrays of thin wires. Good agreement has been obtained for current distri- butions and input and mutual impedances. [Vol. 10, No. 2 (1995), pp 96-101]
Author(s): Andrew A. Efanov, Harald Schopf, Bernhard Schnizer, Andrew A. Efanov, Harald Schopf, Bernhard Schnizer
File Type: Journal Paper
Issue:Volume: 10      Number: 2      Year: 1995
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Title: CURRENT-BASED HYBRID MOMENT METHOD ANALYSIS OF ELECTROMAGNETIC RADIATION AND SCATTERING PROBLEMS
Abstract: A current-based hybrid method combining the method of moments (MM) with asymptotic current expansions for the higher frequency range is presented for the analysis of arbitrarily shaped, three-dimensional, perfectly conducting electromagnetic radiation and scattering problems. Some examples demonstrate the drastic saving in memory requirement and CPU-time when applying the hybrid method as compared to the conventional MM. Even though the proposed method is a frequency domain formulation, some time domain results based on a Fourier transform are presented as they show an accurate description of diffracted and creeping waves. [Vol. 10, No. 3 (1995), Special Issue on Advances in the Application of Method of Moments to Electromagnetic Radiation and Scattering Problems, pp 38-46
Author(s): Ulrich Jakobus, Friedrich M. Landstorfer, Ulrich Jakobus, Friedrich M. Landstorfer
File Type: Journal Paper
Issue:Volume: 10      Number: 3      Year: 1995
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Title: PARAMETRIC MAPPING OF VECTOR BASIS FUNCTIONS FOR SURFACE INTEGRAL EQUATION FORMULATIONS
Abstract: A parametric mapping of vector basis functions is presented for curved-patch discretizations of surface integral equations. The mapping of the vector basis function maintains the normal continuity of the surface current density at cell boundaries, and is therefore suitable for use with the electric-field integral equation. Expressions for the matrix elements associated with the electric and magnetic field integral equations are developed. [Vol. 10, No. 3 (1995), Special Issue on Advances in the Application of Method of Moments to Electromagnetic Radiation and Scattering Problems, pp 107-115]
Author(s): Andrew F. Peterson, Keith R. Aberegg, Andrew F. Peterson, Keith R. Aberegg
File Type: Journal Paper
Issue:Volume: 10      Number: 3      Year: 1995
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Title: APPLICATION OF THE UMOM FOR THE COMPUTATION OF THE SCATTERING BY DIELECTRICS COATED WITH WEAKLY NONLINEAR LAYERS
Abstract: The paper describes an iterative approach to the computation of the electromagnetic scattering by isotropic, dielectric objects partially made of weakly nonlinear materials The approach is started by using a perturbative moment-method solution based on the Sherman-MorrisonWoodbury formula. The nonlinearity is assumed to be of the Kerr type, i e, the dielectric permittivity depends on the square amplitude of the electric field The bistatic scattering width and the field distribution are computed for some test cases, in particular, for infinite cylinders coated and filled with nonlinear materials The convergence of the medium is numerically evaluated and the results are compared with those obtained by the iterative distorted-wave Born approximation. [Vol. 10, No. 3 (1995), Special Issue on Advances in the Application of Method of Moments to Electromagnetic Radiation and Scattering Problems, pp 139-145]
Author(s): Salvatore Caorsi, Andrea Massa, Matteo Pastorino, Salvatore Caorsi, Andrea Massa, Matteo Pastorino
File Type: Journal Paper
Issue:Volume: 10      Number: 3      Year: 1995
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Title: ON THE COMBINATION OF MMP WITH MOM
Abstract: The Multiple Multipole Program (MMP) [1] is based on the Generalized Multipole Technique (GMT) [2]. This method lies between a purely analytic solution and the well-known Method of Moments (MoM) [3]. The goal of this paper is to demonstrate how a combination of MMP with MoM can be achieved for obtaining more powerful codes. The combination presented here is based on an implementation of rooftop functions as a new type of basis function in 3D MMP. Since users of this code are often interested in the close near-field, a special implementation of rooftop functions is presented and tested. (Vol. 9, No. 3 (1994), Special Issue on Generalized Multipole Technique (GMT), pp 18-27]
Author(s): Ch. Hafner, J. Waldvogel, J. Mosig, J. Zheng, Y. Brand, Ch. Hafner, J. Waldvogel, J. Mosig, J. Zheng, Y. Brand
File Type: Journal Paper
Issue:Volume: 9      Number: 3      Year: 1994
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Title: COMPUTER-BASED ELECTROMAGNETlC EDUCATION
Abstract: Computers provide an exciting opportunity for boosting electromagnetic education and corporate training. Animated graphics of the wave propagation phenomenon, visualization of the abstract and highly mathematical subjects, one-on-one and self-paced tutoring, and the ability to mimic often unavailable and expensive laboratory experiments are among the often-cited benefits of a computer-based electromagnetic education. In this paper, we review the activities of the NSF/IEEE Center for Computer Applications in Electromagnetic Education (CAEME). This Center was established to stimulate and accelerate the use of computers and software tools in EM education. A reflection on the extensive software package developed and distributed by the CAEME Center is described and examples of the developed software are presented. To help integrate available EM software in classroom teaching and corporate training, CAEME developed four multimedia lessons for instruction. These interactive media lessons integrate and allow individuals to interactively manipulate information from multimedia sources such as video, software, and animated graphics and also include instructional information such as quizzes and tutorials to help evaluate the students' performance. Features of these lessons are presented, and future developments in the Center's activities are described. [Vol. 8, No. 1, (1993), Special Issue on Computer Applications in Electromagnetics Education, pp 77-107]
Author(s): Magdy F. Iskander, Magdy F. Iskander
File Type: Journal Paper
Issue:Volume: 8      Number: 1      Year: 1993
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Title: ANALYSIS AND COMPUTATION OF LEAKY-WAVE HYPERTHERMIA APPLICATOR
Abstract: The use of electromagnetic waves to induce hyperthermia in cancer therapy has been the subject of intensive research but obtaining good resolution at depth in the abdomen and pelvic regions remains a fundamental problem. This paper investigates the prospects for generating leaky-waves in tissue to improve field penetration and focussing at depth. An approximate analysis based on a planar structure illustrates the feasibility of obtaining good resolution at depth but leaky-wave action in a strict sense is not possible. Measurements on an applicator conformal with the phantom tissue simulated by a saline solution, demonstrate good resolution and penetration but hotspot regions are detected around the launcher region. A three dimensional finite difference time domain (FDTD) computation is performed in Cartesian, circular cylindrical and elliptic cylindrical coordinates to model all the effects for various geometries of the phantom region and different launching symmetries. The results illustrate the need for symmetric launching of the strip, computational convergence and mode diagnostic data, the shape of the focal region and the useful property of being able to shift the focal region by changing frequency. It is concluded that this new quasi-leaky-wave applicator concept is potentially capable of giving improved focal resolution at depth with some positional control and only one generator is required. Optimising the launching of the quasi- leaky waves on the applicator and preventing hotspot regions from creating unwanted tissue heating are remaining practical problems to address. [Vol. 7, No. 2, pp. 72-84 (1992), Special Issue on Bioelectromagnetic Computations]
Author(s): J. R. James, G. Andrasic., J. R. James, G. Andrasic.
File Type: Journal Paper
Issue:Volume: 7      Number: 2      Year: 1992
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Title: TWO-DIMENSIONAL TEMPERATURE RETRIEVAL IN BIOLOGICAL STRUCTURES BY MULTIFREQUENCY MICROWAVE RADIOMETRY: A SOBOLEV-SPACE SOLUTION
Abstract: The problem of retrieving a two-dimensional temperature distribution from radiometric data measured at various frequencies and for different positions of the sensing antenna around the body has been considered. The retrieval has been modelled as an inverse problem whose solution is investigated in a suitably defined functional space which takes regularity properties of temperature functions into account. The retrieval of hot spots in a cylinder at uniform temperature has been numerically analyzed, the examples being relevant in the hyperthermia treatment of malignancies. [Vol. 7, No. 2, pp. 110-120 (1992), Special Issue on Bioelectromagnetic Computations]
Author(s): Fernando Bardati, Valerie J. Brown, Piero Tognolatti, Fernando Bardati, Valerie J. Brown, Piero Tognolatti
File Type: Journal Paper
Issue:Volume: 7      Number: 2      Year: 1992
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Title: COMPUTATIONAL METHOD FOR POWER LINE MAGNETIC FIELD EVALUATION
Abstract: The paper reports a model for the power line magnetic field evaluation. The obtained results for three different power lines (380 kV double circuit,380 kV single circuit, 220 kV double circuit) was validated with measurement data. Calculated and corresponding measured data were found in good agreement. The influence of geometrical and electrical power line parameters, such as the spatial configuration of the conductors and line phase sequences, is evaluated and discussed. Data on the influence of adjacent line span on the field are also reported. The method can be used for prediction of human exposure in epidemiological studies. [Vol. 7, No. 2, pp. 148-161 (1992), Special Issue on Bioelectromagnetic Computations]
Author(s): Santi Tofani, Giovanni d'Amore, Giancarlo Bonazzola, Giovanni Fiandino, Santi Tofani, Giovanni d'Amore, Giancarlo Bonazzola, Giovanni Fiandino
File Type: Journal Paper
Issue:Volume: 7      Number: 2      Year: 1992
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Title: A HYBRID FINITE ELEMENT FOR CONDUCTORS WITH THIN DENSE COATINGS
Abstract: A hybrid method of using finite elements and boundary integral methods to compute scattering from two dimensional coated conductors is presented. Finite elements are used in and around an electrically dense coating where high sampling rates are required. Since the matrix equations they generate are sparse, they can be quickly solved. The finite element sampling rate is reduced with distance from the scatterer to a very low rate where the boundary integral method provides the exact near field radiation condition. The boundary integral generates a dense matrix which is small due to the reduced sampling. This technique is compared for accuracy and efficiency with series solutions and with method of moments. [Vol. 4, No. 2, pp. 59-72 (1989)]
Author(s): Willlam E. Boyse, Andrew A. Seidl, Willlam E. Boyse, Andrew A. Seidl
File Type: Journal Paper
Issue:Volume: 4      Number: 2      Year: 1989
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Title: HYBRID MOM/SBR METHOD TO COMPUTE SCATTERING FROM A SLOT ARRAY ANTENNA IN A COMPLEX GEOMETRY
Abstract: A method of moments (MoM) code has been developed to compute the scattering from a pla-nar or cylindrically conformal slot array antenna. By hybridizing the MoM with the shooting and bouncing ray (SBR) method, the scattering from a large, complex target with a slot array antenna can be computed. The scattering problem can be decomposed using the field equivalence prin-ciple such that the MoM is employed to model the slot array while the SBR method is used to compute the scattering from the large, complex target. Sample results show the utility of the method and the need to include slot array scat-tering when computing the RCS of a complex target.
Author(s): Andrew D. Greenwood, Jian-Ming Jin, Andrew D. Greenwood, Jian-Ming Jin
File Type: Journal Paper
Issue:Volume: 13      Number: 1      Year: 1998
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Title: SOME EXPERIENCES IN USING NEC2 TO SIMULATE RADIATION FROM SLOTS ON CYLINDERS
Abstract: A numerical method based on use of the NEC2 code has been used to study radiation from a slot in the surface of a conducting cylinder and the results used in a comparison with the eigenfunction series solu-tion. The two cases of an axial and circumferential slot have been taken as representative between them of the more general case of an inclined slot. In the case of a circumferential slot, truncation of the cylin-der to finite length has been found in all cases to lead to numerical and analytic results which are in poor agreement and this has been accounted for with an argument based on the geometrical theory of dif-fraction. However this alone is not enough to explain what is observed with axial slots where, for small cyl-inders, agreement of the two approaches is good but fails for larger cylinders. It is postulated that this is due to excitation of waveguide modes on the inside of the larger cylinders and the result confirmed by clos-ing the ends of the cylinder in the NEC2 model with a system of radial wires, when agreement is again re-stored.
Author(s): S. H. H. Lim, H. E. Green, C. E. Brander, S. H. H. Lim, H. E. Green, C. E. Brander
File Type: Journal Paper
Issue:Volume: 13      Number: 1      Year: 1998
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Title: ON THE BOUNDED PART OF THE KERNEL IN THE CYLINDRICAL ANTENNA INTEGRAL EQUATION
Abstract: The kernel in the cylindrical antenna integral equation was partitioned by Schelkunoff into a com-plete elliptic integral and a bounded integral. This paper gives an exact expression for the bounded part.
Author(s): M. P. Ramachandran, M. P. Ramachandran
File Type: Journal Paper
Issue:Volume: 13      Number: 1      Year: 1998
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Title: HIGHLY PARALLEL IMPLEMENTATION OF THE 3D INTEGRAL EQUATION ASYMPTOTIC PHASE METHOD FOR ELECTROMAGNETIC SCATTERING
Abstract: In this paper, we discuss the implementation of the 3D Integral Equation-Asymptotic Phase (IE-AP) method using the parallel architecture IBM RS/6000 SP. The IE-AP method is a hybrid numerical/asymptotic approach for electromagnetic scattering that attempts to reduce the number of unknowns required to accurately model electrically large structures. The IE-AP method will be described, and results will be reported for the parallel matrix fill implementation, and the relative performance of the PESSL and PETSc toolkits for parallel matrix solution.
Author(s): Xianneng Shen, Aaron W. Davis, Keith R. Aberegg, Andrew F. Peterson, Xianneng Shen, Aaron W. Davis, Keith R. Aberegg, Andrew F. Peterson
File Type: Journal Paper
Issue:Volume: 13      Number: 2      Year: 1998
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Title: FAST FREQUENCY RESPONSE CALCULATIONS OF CAVITY-BACKED APERTURE ANTENNAS USING HYBRID FEM/MOM TECHNIQUE IN CONJUNCTION WITH MODEL BASED PARAMETER ESTIMATION
Abstract: Model Based Parameter Estimation (MBPE) is presented in conjunction with the hybrid Finite Element Method (FEM)/Method of Moments (MoM) technique for fast computation of the input characteristics of cavity-backed aperture antennas over a frequency range. The hybrid FEM/MoM technique is used to form an integro-partial-differential equation to compute the electric field distribution of a cavity-backed aperture antenna. In MBPE, the electric field is expanded as a rational function of two polynomials. The coefficients of the rational function are obtained using the frequency derivatives of the integro-partial-differential equation formed by the hybrid FEM/MoM technique. Using the rational function approximation, the electric field is calculated and the input characteristics of the antenna are obtained over the frequency range. Numerical results for an open coaxial line and a cavity-backed microstrip patch antenna are presented. Good agreement between MBPE and the solutions over individual frequencies is observed. CPU timings for all numerical calculations are presented.
Author(s): C. J. Reddy, , M. D. Deshpande, B. R. Cockrell, F. B. Beck, C. J. Reddy, , M. D. Deshpande, B. R. Cockrell, F. B. Beck
File Type: Journal Paper
Issue:Volume: 13      Number: 3      Year: 1998
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Title: A Hybrid Mom/FEM Technique for Scatter from a Complexe BOR with Appendages
Abstract: A hybrid technique is developed to allow the scattering from small appendages to be approximately combined with the scatter from a large body of revolution (BOR). The hybrid technique thus enables the rotational symmetry of the large BOR to be exploited to solve the scattering problem with much less computational complexitity than a fully three-dimensional (3-D) solution. The technique combines the finite element method (FEM) for BOR scattering with the method of moments (MoM) for small appendages. The hybrid forumlation is discussed in detail, including an approximate Green's function with permits the decoupling of the solutions from the FEM and the MoM. Numerical examples are given to show the applicability and accuracy of the hybrid technique.
Author(s): Andrew D. Greenwood, Jian-Ming Jin, Andrew D. Greenwood, Jian-Ming Jin
File Type: Journal Paper
Issue:Volume: 15      Number: 1      Year: 2000
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Title: Introduction to Genetic Algorithms in Electromagnetics
Abstract: This special issue of the ACES Journal is devoted to nev developments in Genetic Algorithm (GA) applications in computational electromagnetics. Genetic Algorithms have become extremely popular in the computational electromagnetics literature. The papers included in this special issue are very arcane, so I decided to include an unreviewed tutorial overview at the last minute as an introduction for those of you who are at a more basic level. GAs model natural selection and genetics on a computer to optimize a wide range of problems.
Author(s): Randy L. Haupt, Randy L. Haupt
File Type: Journal Paper
Issue:Volume: 15      Number: 2      Year: 2000
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Title: Optimum Population Size and Mutation Rate for a Simple Real Genetic Algorithm that Optimizes Array Factors
Abstract: The population size and mutation rate of a genetic algorithm have great influence upon the speed of convergence. Most genetic algorithm enthusiants use a large population size and low mutation rate due to the recommendations of several early studies. These studies were somewhat limited. This paper presents results that show a small population size and high mutation rate are actually better for many problems.
Author(s): Randy L. Haupt, Sue Ellen Haupt, Randy L. Haupt, Sue Ellen Haupt
File Type: Journal Paper
Issue:Volume: 15      Number: 2      Year: 2000
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Title: On the Implementaion of the Equivalence Theorem in the Hybrid FDTD-MoMTD Technique
Abstract: The hybrid FDTD-MoMTD technique is a powerful tool for analysing the transient excitation of inhomogeneous permeable bodies by arbitrary thin-wire antennas. The technique is based upon the calculation of the equivalent electric and magnetic currents on a Huygen's surface that encloses the antenna. The paper studies, by means of several numerical experiments, the effects on the accuracy of the results of the size of the Huygen's box, the size of the spatial increment in the FDTD algorithm and the distance from the Huygen's surface to the observation point.
Author(s): M. A. Hernandez-Lopez, A. Ruibo Bretones, M. Quintillan, R. Gomez Martin, M. A. Hernandez-Lopez, A. Ruibo Bretones, M. Quintillan, R. Gomez Martin
File Type: Journal Paper
Issue:Volume: 16      Number: 1      Year: 2001
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Title: A MICROWAVE IMAGING APPROACH BASED ON AMPLITUDE-ONLY DATA FOR THE RECONSTRUCTIN OF THE ELECTROMAGNETIC FIELD INDUCED IN BIOLOGICAL PHANTOMS
Abstract: In this paper, a microwave imaging technique for the reconstructin of the electromagnetic field distribution inside exposed biological bodies from amplitude-only data is presented. The scattering problem, formulated in terms of integral equations, is recast into an optimization problem after defining a suitable cost function which is proportional to the difference between reconstructed and measured amplitudes of the scattered and of the incident electric fields in the near-field region. The field solution is obtained by minimizing the cost function by means of an hybrid simulated annealing-conjugate gradient based procedure, which, in principle, ensures the convergence to the global minimum, preventing the solution from being trapped in local minima. Moreover, the proposed approach prevents the problems due to inaccuracies in near-field phase measurements. The effectiveness of the microwave imaging approach is assessed by means of some numerical expamples (with synthetic input data) concerning a realistic cross-section of a biological phantom exposed to a TM electromagnetic illumination. The presence of noise on synthetic data is also considered and the dependence of the reconstruction accuracy on the signal-to-noise ratio investigated. Finally, in order to give some indications to further improve the prediction capability of the proposed approach, some preliminary guidelines are pointed out.
Author(s): Salvatore Caorsi, Emanuela Bermani, Andrea Massa, Salvatore Caorsi, Emanuela Bermani, Andrea Massa
File Type: Journal Paper
Issue:Volume: 16      Number: 2      Year: 2001
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Title: Higher Order Spatial Operators for the Finite Integration Theory
Abstract: The Finite Integration Technique (FIT) according to T. Weiland is an efficient and universal method for solving a large scale of problems in computational electrodynamics. Up to now the conventional formulation itself has had an accuracy order of two with respect to the spatial discretization. In this paper an innovative extension to fourth or even higher order is presented. The convergence of the presented scheme is demonstrated by a general dispersion equation and stability issues are discussed. An approach for a stable spatial interface connecting regions of higher order with the standard FIT scheme is proposed.
Author(s): Holger Spachmann, Rolf Schuhmann, Thomas Weiland, Holger Spachmann, Rolf Schuhmann, Thomas Weiland
File Type: Journal Paper
Issue:Volume: 17      Number: 1      Year: 2002
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Title: Methods for the Evaluation of Regular, Weakly Singular and Strongly SingularSurface Reaction Integrals Arising in Method of Moments
Abstract: The accurate and fast evaluation of surface reaction integrals for Method of Moments computations is presented. Starting at the classification of the integrals into regular and weakly, strongly and nearly singular integrals, appropriate methods are presented that handle each. A Gauss-Legendre quadrature rule evaluates regular integrals. For singular integrals, the singularity is lifted or weakened by an extraction of the singularity, a transform to polar coordinates or a domain transform. The resulting regular integral is in turn solved by a quadrature rule. The different methods are finally applied to an example, and the resulting accuracy tested against the analytical result. The presented methods are general enough to be used as integration methods for integrands with various degrees of singularity and is not limited to Method of Moments.
Author(s): Alexander Herschlein, Juergen v. Hagen, Werner Wiesbeck, Alexander Herschlein, Juergen v. Hagen, Werner Wiesbeck
File Type: Journal Paper
Issue:Volume: 17      Number: 1      Year: 2002
Download Link:Click here to download PDF     File Size: 340 KB

Title: Accuracy of currents produced by the locally-corrected Nystrom method and the method of moments when used with higher-order representations
Abstract: The locally-corrected Nyström method is described, and the accuracy of the currents produced by it and the method of moments are compared. Results suggest that when the underlying representation has the same order, the methods are comparable in accuracy. Additional results are presented to illustrate the Nyström approach, and advantages and disadvantages of the method are reported.
Author(s): Andrew F. peterson, Andrew F. peterson
File Type: Journal Paper
Issue:Volume: 17      Number: 1      Year: 2002
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Title: High-Order Nystrom Method for Computing Waveguide Modes
Abstract: We report a novel method for accurately computing the modes of an arbitrarily-shaped hollow waveguide. Our method uses a point-based (Nystrom) discretization of an integral operator over the waveguide aperture to compute the modes.
Author(s): J. J. Ottusch, S. M. Wandzura, J. J. Ottusch, S. M. Wandzura
File Type: Journal Paper
Issue:Volume: 17      Number: 1      Year: 2002
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Title: Electric Dyadic Green's Functions for Modeling Resonance and Coupling Effects in Waveguide-Based Aperture-Coupled Patch Arrays
Abstract: An efficient technique for the rapid development of electric Green's dyadics of a transversely layered, terminated rectangular waveguide is presented with application to waveguide-based aperture-coupled patch arrays. This technique uses a partial eigenfunction expansion resulting in a Sturm-Liouville problem for one-dimensional characteristic Green's functions in the waveguiding direction. In this representation, the one-dimensional characteristic Green's functions provide physical insight into resonance and surface wave effects occurring in overmoded layered waveguide transitions. Particularly, this is related to the correlation between transverse resonances in the waveguide cross-section and surface waves associated with a grounded dielectric slab waveguide. This is demonstrated for the examples of aperture-coupled patch arrays in the N-port waveguide transition, although the analysis is applicable to other waveguide-based antenna structures, which allow for the propagation of surface waves.
Author(s): Alexander B. Yakovlev, Sean Ortiz, Mete Ozkar, Amir Mortazawi, Michael B. Steer, Alexander B. Yakovlev, Sean Ortiz, Mete Ozkar, Amir Mortazawi, Michael B. Steer
File Type: Journal Paper
Issue:Volume: 17      Number: 2      Year: 2002
Download Link:Click here to download PDF     File Size: 234 KB

Title: A Comparative Study of NN and SVM-Based Electromagnetic Inverse Scattering Approaches to On-Line Detection of Buried Objects
Abstract: Microwave-based sensing techniques constitute an important tool for the detection of buried targets. In this framework, a key issue is represented by real-time scatterer localization. As far as such a topic is concerned, this paper presents a comparative evaluation of the performances provided by a conventional NN-based inverse scattering technique and by a new SVM-based electromagnetic approach. In order to estimate the effectiveness values of the two methods, realistic configurations and noisy enviornments are considered and current capabilities, as well as potential limitations, are pointed out. Finally, possible future research work is outlined.
Author(s): Salvatore Caorsi, Davide Anguita, Emanuela Bermani, Andrea Boni, Massimo Donelli, Salvatore Caorsi, Davide Anguita, Emanuela Bermani, Andrea Boni, Massimo Donelli
File Type: Journal Paper
Issue:Volume: 18      Number: 2      Year: 2003
Download Link:Click here to download PDF     File Size: 319 KB

Title: Accelerating Computations with a MoM-Based Computer Program
Abstract: Electromagnetic research often requires studies within wider frequency ranges. For achieving a fine resolution in the frequency domain, the required computation time is usually high. Here the MoM-based field computation program FEKO working in frequency domain is used for this purpose. In order to reduce the computational costs by minimizing the number of sampling points used, the interpolation algorithm MPBE (Model Based Parameter Estimation) is applied to achieve a mathematically based approximation of the problem. This paper presents the acceleration of computations with FEKO using the interpolation algorithm MBPE. A short introduction to FEKO is given at the beginning. Subsequently the implementation of MBPE as well as three possible adaptive strategies for further shortening the computation time is presented. Finally examples are given that show the advantages of this implemented method.
Author(s): M. Schick, F. M. Landstorfer, M. Schick, F. M. Landstorfer
File Type: Journal Paper
Issue:Volume: 18      Number: 3      Year: 2003
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Title: Computation of SAR in Cell Culture Flasks Exposed to 900 MHz GSM Type Signals in a Modified TEM Cell
Abstract: In order to provide rigorous dosimetry for in vitro studies, Telstra Research Laboratories has developed a modified transverse electromagnetic cell exposure system. The system acts as a chamber for experiments in which a human cell culture exists as a very thin monolayer adhered to the bottom of a plastic culture flask under a layer of several millimetres of RPMI nutrient medium while incubated in a controlled atmosphere. A key to the rigour of any experiment seeking to investigate possible effects of electromagnetic energy on living systems is to ensure that the exposures used are accurately known, and to achieve this, numerical methods for the challenging task of characterising the SAR profile in the medium have been developed. This paper describes salient aspects of the development and analysis of the system.
Author(s): R. L. McIntosh, R. J. McKenzie, S. Iskra, A. Carratelli, P. Standaert, R. L. McIntosh, R. J. McKenzie, S. Iskra, A. Carratelli, P. Standaert
File Type: Journal Paper
Issue:Volume: 18      Number: 3      Year: 2003
Download Link:Click here to download PDF     File Size: 238 KB

Title: High Accuracy Calculation of the Magnetic Vector Potential on Surfaces
Abstract:
Author(s): Malcolm M. Bibby, Andrew F. Peterson, Malcolm M. Bibby, Andrew F. Peterson
File Type: Journal Paper
Issue:Volume: 18      Number: 1      Year: 2003
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Title: Numerical Study of Coupling between Coagulators and Electrodes of Cardiac Pacemakers under Consideration of the Human Body
Abstract: The paper presents a numerical, worst-case study of the coupling between coagulators and cardiac pacemakers under consideration of the human body. For this purpose two special body models have been implemented. With these models whose electrical properties correspond to a weighted average of those of different tissues of the human body the influence of the latter can be taken into account in the computations. Different parameters such as position of the pacemaker and its electrode, coagulation frequency, and coagulation point on the surface of the human body are considered. Based on results of previous investigations simplified approaches to account for the dielectric coating of the coagulator electrode and housing of the pacemaker can be used. The investigation shows, that for the scenario described above, strong peaks occur in the resulting graphs arising form resonance effects on the coagulator cable.
Author(s): Markus Schick, Friedrich M. Landstorfer, Markus Schick, Friedrich M. Landstorfer
File Type: Journal Paper
Issue:Volume: 19      Number: 1      Year: 2004
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Title: MODELISATION OF PROBE FEED EXCITATION USING ITERATIVE METHOD
Abstract: This paper presents an implementation of an iterative method based on the waves concept for analyzing patch antennas fed by coaxial probes. This method includes a two-dimensional fast Fourier transform (FFT-2D) in a wave guide environment. The method has the advantage of simplicity in that it does not involve basis functions and inversion of matrices, as used in other calculation methods. Therefore, it is capable of analyzing larger bodies than other classical techniques. An implementation of the iterative calculation is shown for the extraction of S parameters of microwave components and antennas. The good agreement between simulation results and experimental published data justifies the design procedure and validates the present analysis approach.
Author(s): H. Zairi, A. Gharsallah, A. Gharbi, H. Baudrand, H. Zairi, A. Gharsallah, A. Gharbi, H. Baudrand
File Type: Journal Paper
Issue:Volume: 19      Number: 3      Year: 2004
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Title: FDTD Analysis of a Probe-Fed Dielectric Resonator Antenna in Rectangular Waveguide
Abstract: Dielectric resonator antennas (DRA) are characterized for operation in a guided-wave environment with the ultimate goal of their use in modeling of waveguide-based DRA amplifier arrays for spatial power combining. Performance of a single probe-fed DRA element in rectangular waveguide is analyzed by varying design parameters of the DRA and the feeding probe to optimize the structure for the scattering characteristics (port matching and coupling). The effect of hard walls on the DRA behavior is also studied. The numerical analysis of waveguide-based DRA elements is based on the Finite-Difference Time-Domain (FDTD) method and a coaxial probe is modeled by a thin wire approximation implemented in the FDTD algorithm. The numerical results are compared with those generated by using commercial software and exhibit a very good agreement.
Author(s): Yizhe Zhang, Ahmed A. Kishk, Alexander B. Yakovlev, Allen W. Glisson, Yizhe Zhang, Ahmed A. Kishk, Alexander B. Yakovlev, Allen W. Glisson
File Type: Journal Paper
Issue:Volume: 21      Number: 1      Year: 2006
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Title: Comparison of WIPL-D to Other EM Computation Methods
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling Using WIPL-D Code(II)      Number:      Year: 2004
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Title: Surface Based Differential Forms
File Type: Conference Paper
Issue:Volume: Hybrid CEM Techniques      Number:      Year: 2005
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Title: Response Sensitivity Analysis with Frequency-Domain Full-Wave Electromagnetic Solvers
File Type: Conference Paper
Issue:Volume: Optimization and Solution of Complex EM problems      Number:      Year: 2004
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Title: Computer-Aided Design of Compact Dual Frequency Arrow Shaped Microstrip Antenna
File Type: Conference Paper
Issue:Volume: Advanced Computational Techniques for Antenna Design      Number:      Year: 2004
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Title: Improving the Numerical Efficiency of Generalized Multipole Technique by Non-redundant Multipole Choices
File Type: Conference Paper
Issue:Volume: Computational Techniques      Number:      Year: 2004
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Title: Analyzing the Stability of the New FDTD Technique for Non-Dispersive Bi-Isotropic Media Using the von Neumann Method.
File Type: Conference Paper
Issue:Volume: Bianisotropic and Metamaterial      Number:      Year: 2004
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Title: New Ray-Tracing Techniques and Propagation Modeling for Challenging Communication Environments
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling      Number:      Year: 2004
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Title: Application of an iterative method for the solution of electromagnetic scattering from wire antennas
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling      Number:      Year: 2004
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Title: Design and Optimisation of an Antenna Array for WIMAX Base Stations
File Type: Conference Paper
Issue:Volume: Beamforming and Smart Antennas      Number:      Year: 2005
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Title: Hard and Soft Surfaces Realized by Frequency Selective Surfaces on a Grounded Dielectric Slab
File Type: Conference Paper
Issue:Volume: Electromagnetic Analysis of Wave Phenomena      Number:      Year: 2005
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Title: European effort towards a unified framework for the analysis of antenna structures
File Type: Conference Paper
Issue:Volume: Special Session: Recent Electromagnetics & Antennas Activities in the European Network "ACE"      Number:      Year: 2005
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Title: The Channel Characterization and Performance Evaluation of Mobile Communication Employing Stratospheric Platform
File Type: Conference Paper
Issue:Volume: Propagation Channel Characterization      Number:      Year: 2005
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Title: Propagation Prediction Software for Wireless Communication System Optimization
File Type: Conference Paper
Issue:Volume: Propagation Channel Characterization      Number:      Year: 2005
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Title: Efficient Calculation of Field Distribution with High-Resolution Using Ray-Tracing Method
File Type: Conference Paper
Issue:Volume: Fast and Efficient CEM Methods      Number:      Year: 2005
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Title: Study of Electromagnetic Scattering From Material Object Doped Randomely WithThin Metallic Wires Using Finite Element Method
File Type: Conference Paper
Issue:Volume: Hybrid CEM Techniques      Number:      Year: 2005
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Title: Analysis of a Linear Slot Array Comprised of Tilted Edge Slots Cut in the Narrow Wall of a Rectangular Waveguide
File Type: Conference Paper
Issue:Volume: Special Session: Communication Antenna Analysis and Design      Number:      Year: 2005
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Title: Narrow Beam Adaptive Array for Advanced Wireless Applications
File Type: Conference Paper
Issue:Volume: Special Session: Communication Antenna Analysis and Design      Number:      Year: 2005
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Title: The Influence of Data Density on the Consistency of Performance of the Feature Selective Validation (FSV) Technique
Abstract: The human visual system has an immense capacity for compensating for poor or incomplete data. Psycho-visual coding schemes make use of the brain’s ability to extrapolate and interpolate independently of conscious awareness to reduce data (bit) rates but maintain the same level of ‘information’ within a video signal. However, when attempting to produce a simple method for comparing data-sets, primarily for validation of computational electromagnetics, could give rise to a problem. Namely that someone undertaking the visual inspection of (e.g.) modeled data against experimental data will see the same picture whether sampled at N, 100N or 0.01N data points whereas the software undertaking the comparison would process three very different data sets. The Feature Selective Validation (FSV) method was developed to attempt to mimic the group response of a number of experts undertaking the visual comparison. Hence, the quality of performance of the FSV method should not be severely affected by the number of data points if this assertion is to hold, despite the obvious potential for variation. This paper investigates the FSV performance as a function of data density and shows that the accuracy of its performance remains largely unimpeded by variations in the precision of the data supplied.
Author(s): Alistair Duffy, Antonio Orlandi, Alistair Duffy, Antonio Orlandi
File Type: Journal Paper
Issue:Volume: 21      Number: 2      Year: 2006
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Title: Polarization Isolation Characteristics Between Two Center-Feed Single-Layer Waveguide Arrays Arranged Side-by-Side
Abstract: Abstract - The near field coupling between two large alternating-phase fed single-layer waveguide arrays arranged side-by-side is analyzed by the Finite Element Method (FEM) (HFSS). First, the overall reflection as well as the radiation pattern from the array (320 slots and 18.4 λ x 14.9 λ) is analyzed, and excellent agreement with measurements is observed. Next, the isolation between two arrays is computed, and remarkable polarization isolations of more than 80 dB are predicted. The isolation is verified by measurements. The influence of the relative arrangement of the arrays upon the isolation is discussed.
Author(s): Yasuhiro Tsunemitsu, Jiro Hirokawa, Makoto Ando, Yohei Miura, Yasuhiro Kazama, Naohisa Goto, Yasuhiro Tsunemitsu, Jiro Hirokawa, Makoto Ando, Yohei Miura, Yasuhiro Kazama, Naohisa Goto
File Type: Journal Paper
Issue:Volume: 21      Number: 3      Year: 2006
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Title: Genetic Algorithm Optimization of a Traveling Wave Array of Longitudinal Slots in a Rectangular Waveguide
Abstract: Abstract — Genetic Algorithm is used to optimize the performance characteristics of a traveling wave array consisting of longitudinal slots cut in the broad wall of a rectangular waveguide. An analysis method employing a loaded transmission line to model the slot arrays is employed. External mutual coupling is considered. The self admittance of the radiating slots is computed using the method-of-moments technique applied to the pertinent integral equations. Numerical results indicate typical performance improvements possible using the genetic algorithm optimization.
Author(s): Anders Jensen, Sembiam R. Rengarajan, Anders Jensen, Sembiam R. Rengarajan
File Type: Journal Paper
Issue:Volume: 21      Number: 3      Year: 2006
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Title: Cascading Optical Negative Index Metamaterials
Abstract: We use a spatial harmonic analysis (SHA) method to homogenize optical metamaterials with a negative refractive index; the method provides a more general approach than other methods for estimating the effective index of materials arranged of cascaded elementary layers. The approach is validated for a single layer and a triple layer two dimensional metal grating.
Author(s): Alexander V. Kildishev, Uday K. Chettiar, Alexander V. Kildishev, Uday K. Chettiar
File Type: Journal Paper
Issue:Volume: 22      Number: 1      Year: 2007
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Title: Characterizing Infrared Frequency Selective Surfaces on Dispersive Media
Abstract: With the emergence of frequency selective surfaces (FSS) and other passive planar antenna devices at infrared frequencies, the increasing need for accurate characterization using numerical modeling prior to device fabrication has exposed limitations in the traditional modeling procedures used for lower frequency FSS designs. To improve full-wave FSS models at IR, a procedure to measure and integrate dispersive material properties in modeling is described. Measured and modeled results are provided as verification demonstrating the need to account for material dispersion in infrared FSS design.
Author(s): James Ginn, Brian Lail, David Shelton, Jeffrey Tharp, William Folks and Glenn Boreman, James Ginn, Brian Lail, David Shelton, Jeffrey Tharp, William Folks and Glenn Boreman
File Type: Journal Paper
Issue:Volume: 22      Number: 1      Year: 2007
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Title: Investigation of Wire Grid Modeling in NEC Applied to Determine Resonant Cavity Quality Factors
Abstract: Numerical computer simulations using the NEC Method of Moments (MoM) code were performed on wire grid models of resonant cavities in order to study how well conductive structures and their surface impedances can be modeled by wire meshes. The resonant cavity quality factor, or Q, was examined due to its high sensitivity to surface impedance. Several half-wave coaxial cavities were simulated using various mesh element sizes. The cavities’ outer conductor radius was varied to obtain different geometries. The quality factor Q was determined from the simulated input impedance spectra. The wire grid model results were compared to well known theoretical and experiment results. Qualitative agreement between simulation, theoretical, and experimental results was achieved for fixed mesh parameters, giving confidence in comparative simulation using the same wire grid meshing parameters. Quantitative agreement of simulation results was achieved through repeated simulation with varying mesh element lengths and extrapolating the simulation results to a conceptual mesh element length of zero. This shows that simulations to determine quantities sensitive to surface impedances can be successfully performed with codes such as NEC.
Author(s): Franz A. Pertl, Andrew D. Lowery, James E. Smith, Franz A. Pertl, Andrew D. Lowery, James E. Smith
File Type: Journal Paper
Issue:Volume: 22      Number: 3      Year: 2007
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Title: A Review of Statistical Methods for Comparing Two Data Sets
Abstract: Statistical approaches to compare data for validation of computational electromagnetics have been used for several years. They provide an accepted means of obtaining a numerical value to quantify the data under consideration. However, the use and meaning of these ‘numbers’ depends, by necessity, on the application. This paper provides an overview of some of the most widely applicable techniques, relating the output of these to visual assessment. It further includes comparison with the FSV (Feature Selective Validation) method allowing a triangulation between statistical approaches, visual approaches and heuristic approaches to validation. It is important that the decision to use or reject a particular technique for validation is based on a rational and objective selection approach. This paper suggests a framework to support this selection approach.
Author(s): A. Duffy, A. Orlandi, A. Duffy, A. Orlandi
File Type: Journal Paper
Issue:Volume: 23      Number: 1      Year: 2008
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Title: Analysis and Design of a Planar Multilayered FSS with Arbitrary Incidence
File Type: Journal Paper
Issue:Volume: 23      Number: 2      Year: 2008
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Title: Characterization of Meta-Materials Using Computational Electromagnetic Methods
File Type: Conference Paper
Issue:Volume: Metamaterials      Number:      Year: 2005
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Title: Numerical Modeling Interaction of RF Field in MRI with a Pregnant Female Model
File Type: Conference Paper
Issue:Volume: Electromagnetic Imaging      Number:      Year: 2005
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Title: Lightning Electromagnetic Fields Computation using Time Domain Finite Element Method
File Type: Conference Paper
Issue:Volume: Advances in Time Domain Techniques      Number:      Year: 2005
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Title: A Multiresolution Model of Transient Microwave Signals in Dispersive Chiral Media
File Type: Conference Paper
Issue:Volume: Advances in Time Domain Techniques      Number:      Year: 2005
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Title: Slot Antenna for Ultra Wideband System
File Type: Conference Paper
Issue:Volume: Wideband Antennas      Number:      Year: 2005
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Title: Comparative Study of Wideband Properties of Planar Solid and Strip Fractal Bow-Tie Dipoles
File Type: Conference Paper
Issue:Volume: Wideband Antennas      Number:      Year: 2005
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Title: High Performance Low Cost Ferroelectric Phase Shifters Designed for Simple Biasing
File Type: Conference Paper
Issue:Volume: Special Session: Electromagnetic Modeling by WIPL-D      Number:      Year: 2005
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Title: Numerical Simulation of the Generation of Synchrotron Radiation in a Vacuum Chamber with FEKO
File Type: Conference Paper
Issue:Volume: FEKO Modeling and Analysis - 2      Number:      Year: 2006
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Title: Self-Adjoint Sensitivity Analysis of High-Frequency Structures with FEKO
File Type: Conference Paper
Issue:Volume: FEKO Modeling and Analysis - 2      Number:      Year: 2006
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Title: Fast Hybrid CAD Technique for the Optimization of Advanced Waveguide Components and Aperture Antennas
File Type: Conference Paper
Issue:Volume: Hybrid Techniques      Number:      Year: 2006
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Title: Self-Adjoint Sensitivity Analysis of High-Frequency Structures with FEKO
File Type: Conference Paper
Issue:Volume: Poster Session- Students Paper Competition      Number:      Year: 2006
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Title: Modeling Localized Surface Plasmons in Light Tunneling and New Optical Sensing Approach
File Type: Conference Paper
Issue:Volume: Computational Electromagnetics for Photonics      Number:      Year: 2007
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Title: Low-frequency analysis of electromagnetic interference from SMPS
File Type: Conference Paper
Issue:Volume: Innovation in the Macromodeling of High Speed Interconnects      Number:      Year: 2007
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Title: Optimization of a High-Speed Interconnect Link Under Signal Integrity Constraints
File Type: Conference Paper
Issue:Volume: Innovation in the Macromodeling of High Speed Interconnects      Number:      Year: 2007
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Title: Parallelized Integral Equation Methods for Signal Integrity
File Type: Conference Paper
Issue:Volume: Macromodeling for EMC and SI Complex Systems      Number:      Year: 2007
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Title: Analysis of Photonic Band Gap using Multilayer Contribution of Wave Concept Iterative Process MLC-WCIP
Abstract: Microstrip elements are modeled in multilayered contribution. An iterative method based on the concept of waves is developed in a form useful for efficient computation for interacting microstrip elements, which may be located at any substrate layer and separated by a large distance. The multilayer contribution of iterative method is developed in the spatial domain. Examples for regularly shaped geometries in multilayered media are presented. These involve the optimization of a microstrip ring with a narrow gap which induces multiple reflections with a fixed phase correlation necessary to make the photonic band gap. The analysis takes into account eventual coupling parasites. Experimental measurements are performed to validate the computation. The approach involves the mixed magnetic and electric field equation technique and the wave concept iterative process which involves S-parameters extraction technique. In this sense, a program in FORTRAN has been elaborated to determine different parameters Sij characterizing the studied structure. A good agreement between numerical and reported results is important to validate the theory of the multilayer contribution of iterative method MLC-WCIP.
Author(s): E. A. Hajlaoui, H. Trabelsi, A. Gharsallah, H. Baudrand
File Type: Journal Paper
Issue:Volume: 24      Number: 3      Year: 2009
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Title: A Mode Selecting Eigensolver for 2D FIT Models of Waveguides
Abstract: For the computation of eigenmodes in multimodal waveguide structures, the Jacobi- Davidson eigenvalue solver is extended by a vector-based weighting function. It allows to generate only modes with a desired field distribution. The performance of this solver is studied by means of an eigenmode computation in a photonic crystal fiber which is discretized by the finite integration technique. The new algorithm is able to separate the modes in the fiber core from a number of non-physical modes which originate from a transversal PML-type boundary condition.
Author(s): B. Bandlow, R. Schuhmann
File Type: Journal Paper
Issue:Volume: 24      Number: 6      Year: 2009
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Title: Application of the Normalized Surface Magnetic Source Model to a Blind Unexploded Ordnance Discrimination Test
Abstract: The Normalized Surface Magnetic Source (NSMS) model is applied to unexploded ordnance (UXO) discrimination data collected at Camp Sibert, AL, with the EM63 electromagnetic induction sensor. The NSMS is a fast and accurate numerical forward model that represents an object’s response using a set of equivalent magnetic dipoles distributed on a surrounding closed surface. As part of the discrimination process one must also determine the location and orientation of each buried target. This is achieved using a physics-based technique that assumes a target to be a dipole and extracts the location from the measured magnetic field vector and the scalar magnetic potential; the latter is reconstructed from field measurements by means of an auxiliary layer of magnetic charges. Once the object’s location is estimated, the measured magnetic field is matched to NSMS predictions to determine the timedependent amplitudes of the surface magnetic sources, which in turn can be used to generate classifying features. This paper shows the superior discrimination performance of the NSMS model.
Author(s): F. Shubitidze, J. P. Fernandez, I. Shamatava, L. R. Pasion, B. E. Barrowes, K. O'Neill
File Type: Journal Paper
Issue:Volume: 25      Number: 1      Year: 2010
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Title: New Antennas Based on Triangular Patch as a Solution for RFID Application
Abstract: This paper covers the design of a new antenna for RFID applications at microwave frequencies. Five antennas are studied. The first three structures are inspired from a triangular patch, whereas the fourth and the fifth are inspired from a Sierpenski fractal antenna. The size reduction is more than 80%, which explains the utility of the proposed antennas.
Author(s): A. Ferchichi, N. Sboui, A. Gharsallah, H. Baudrand
File Type: Journal Paper
Issue:Volume: 25      Number: 3      Year: 2010
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Title: RFID-Based System for Pilgrims Identification and Tracking
Abstract: This paper describes a prototype of a system developed using a passive RFID wristband tag for identification of pilgrims in the holy areas during Hajj. Upon presentation of the tag to a handheld reader all information related to the pilgrim holding the tag will be displayed on the screen of the reader. This way if a pilgrim gets sick, lost, or dies he can be easily identified through the tag on the spot. Officers around the holy area will have a light-weight handheld reader that can get all information from the tag without the need to burden the already overloaded communication network during the Hajj season. The developed prototype was tested on 1000 pilgrims from the country of Ivory Coast in collaboration with officials from Hajj Ministry and Development Commission of the Holy cities of Makkah and Madinah. The results of the experiment have convinced Hajj authorities to utilize this technology for all pilgrims in the future. Additionally, we have explored the possibility of tracking pilgrims using active RFID system. Due to the small number of working tags, experiment was performed only on 6 persons. Results of the latter experiment have shown that the system requires further development and needs to be validated with a larger number of tags.
Author(s): M. Mohandes
File Type: Journal Paper
Issue:Volume: 25      Number: 3      Year: 2010
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Title: A New Software and Hardware Parallelized Floating Random-Walk Algorithm for the Modified Helmholtz Equation Subject to Neumann and Mixed Boundary Conditions
Abstract: A new floating random-walk algorithm for the one-dimensional modified Helmholtz equation subject to Neumann and mixed boundary conditions problems is developed in this paper. Traditional floating random-walk algorithms for Neumann and mixed boundary condition problems have involved “reflecting boundaries” resulting in relatively large computational times. In a recent paper, we proposed the elimination of the use of reflecting boundaries through the use of novel Green’s functions that mimic the boundary conditions of the problem of interest. The methodology was validated by a solution of the one-dimensional Laplace’s equation. In this paper, we extend the methodology to the floating random-walk solution of the onedimensional modified Helmholtz equation, and excellent agreement has been obtained between an analytical solution and floating random-walk results. The algorithm has been parallelized and a near linear rate of parallelization has been obtained with as many as thirty-two processors. These results have previously been published in [1]. In addition, a GPU implementation employing 4096 simultaneous threads displayed a similar near-linear parallelization gain and a one to two orders of magnitude improvement over the CPU implementation. An immediate application of this research is in the numerical solution of the electromagnetic diffusion equation in magnetically permeable and electrically conducting objects with applications in dielectrometry and magnetometry sensors that have the ability to detect sub-surface objects such as landmines. The ultimate goal of this research is the application of this methodology to the solution of aerodynamical flow problems.
Author(s): K. Chatterjee, M. Sandora, C. Mitchell, D. Stefan, D. Nummey, J. Poggie
File Type: Journal Paper
Issue:Volume: 25      Number: 4      Year: 2010
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Title: Iterative Solution of Electromagnetic Scattering by Arbitrary Shaped Cylinders
Abstract: The electromagnetic scattering analysis of geometrically complex structure has played an important role in electromagnetic field theory and practicable applications. The fast and rigorous methods to solve such problem are in great demand. In this work, the Wave Concept Iterative Process (WCIP) combined with a coordinate transformation has been extended to the scattering problems of electromagnetic conducting square cylinder, conducting super-ellipsoid and conducting super-ellipsoid coated with thin dielectric materials. Numerical results illustrate the efficiency of our approach. The radar cross section (RCS) is then reached and compared with the literature.
Author(s): J. Selmi, R. Bedira, A. Gharsallah, A. Gharbi, H. Baudrand
File Type: Journal Paper
Issue:Volume: 25      Number: 7      Year: 2010
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Title: Analysis of Dual-Mode Microstrip Patch Filter using Multiscale Wave Concept Iterative Process
Abstract: An iterative method based on the multiscale approach named multiscale wave concept iterative process (MWCIP) is introduced in this paper. This new approach is an extension of the known wave concept iterative process (WCIP). The specificity of the MWCIP method is the nonuniform meshing with macropixels used to improve the time delay computations of the classical iterative procedure. The method is applied successfully to a nondegenerate dual-mode microstrip patch filter. Comparison between the new and classical iterative methods shows that with the presented approach the CPU time and memory requirement have been considerably reduced.
Author(s): T. I. E. Brahim, H. Zairi, A. Gharsallah, A. Gharbi, H. Baudrand
File Type: Journal Paper
Issue:Volume: 25      Number: 9      Year: 2010
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Title: Analysis of Circular Slots Leaky-Wave Antenna in Cylindrical Waveguide by Wave Concept Iterative Procedure
Abstract: This paper presents the analysis of circular slots leaky-wave antenna by using an iterative method based on the wave concept. The classic method has been reformulated in cylindrical coordinates in order to be adequate for the analysis of the leaky-wave antenna with fast convergence. The proposed leaky-wave antenna can be used to replace a micro-strip patch array. Numerical results are presented to illustrate the advantages of the proposed structure. A good agreement between the new wave concept iterative procedure (WCIP) method results and published data is obtained.
Author(s): Z. Houaneb, H. Zairi, A. Gharsallah, H. Baudrand
File Type: Journal Paper
Issue:Volume: 25      Number: 10      Year: 2010
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Title: Fast Design Optimization of Microwave Structures Using Co-Simulation-Based Tuning Space Mapping
Abstract: Tuning space mapping (TSM) expedites efficient design optimization of microwave circuits by replacing sections in the electromagnetic (EM) model with corresponding sections of designable equivalent elements. A key assumption of TSM is that these designable elements can replace their respective EM model sections without introducing significant distortion in the structure’s response. This can be achieved through the co-calibrated ports technique introduced in Sonnet em. Here, we generalize the TSM algorithm. A tuning model is constructed by simulating the EM model sections separately and connecting them with the tuning components through a co-simulation process. This allows us to implement the TSM algorithm with any EM simulator. The response misalignment between the original structure and the tuning model is reduced using classical space mapping. The proposed algorithm is illustrated through the design of two microstrip filters simulated in FEKO.
Author(s): S. Koziel, J. W. Bandler
File Type: Journal Paper
Issue:Volume: 26      Number: 8      Year: 2011
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Title: Improving the Convergence of the Wave Iterative Method by Filtering Techniques
Abstract: Among the numerical methods used in the electromagnetic modeling of high frequency electronic circuits, we include the wave concept iterative method. In this paper, we propose to improve the convergence speed of this method when modeling a complex structure. This method requires a maximum number of iterations, noted “Nmax”, to achieve the convergence to the optimal value. Our goal is to reduce the number of iterations calculated by this method to the value “Nmin” in order to reduce the computing time and to improve the convergence speed. This is done by adding a new algorithm based on filtering techniques.
Author(s): H. Hrizi, L. Latrach, N. Sboui, A. Gharsallah, A. Gharbi, H. Baudrand
File Type: Journal Paper
Issue:Volume: 26      Number: 10      Year: 2011
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Title: Surface Integral Equation Solvers for Large-Scale Conductors, Metamaterials and Plasmonic Nanostructures
Abstract: Surface integral equation (SIE) approaches for the accurate solution of different problems in computational electromagnetics are addressed. First, an efficient message passing interface (MPI)/OpenMP parallel implementation of the multilevel fast multipole algorithm-fast Fourier transform (MLFMA-FFT) is presented for the solution of large-scale conducting bodies. By combining the high scalability of the fast multipole method-FFT (FMM-FFT) with the high efficiency of MLFMA, challenging problems up to one billion unknowns are solved using a parallel supercomputer. Second, looking for the extension of these rigorous approaches to new demanded areas, the SIE method is successfully applied to the solution of left-handed metamaterials and plasmonic nanostructures. Numerical examples are presented to confirm the validity and versatility of this approach for the accurate resolution of problems in the context of leading-edge nanoscience and nanotechnology applications.
Author(s): J. M. Taboada, M. G. Araújo, J. Rivero, L. Landesa, F. Obelleiro
File Type: Journal Paper
Issue:Volume: 27      Number: 2      Year: 2012
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Title: Efficient Analysis of Switchable FSS Structure using the WCIP Method
Abstract: A precise technique based on the wave concept iterative procedure (WCIP) and a fast mode transformation (FMT) is used to adjust the frequency selective surface (FSS) response. This adjustment is achieved by integrating RF-MEMS switches. These systems use the manufacturing processes of integrated circuits. In order to initialize the iterative procedure, an incident wave is defined in spectral domain. The numerical results are compared to those obtained with the finite element method (FEM). The good agreement between simulated and published data justifies the design procedure.
Author(s): N. Sboui, A. Salouha, L. Latrach, A. Gharsallah, A. Gharbi, H. Baudrand
File Type: Journal Paper
Issue:Volume: 27      Number: 3      Year: 2012
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Title: An Adaptive Time-Stepping Algorithm in Weakly Coupled Electro-Thermal 2D-FE Modeling
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2012
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Title: HPC for Legacy EM Code, a Mixed Language Approach using CUDA
File Type: Conference Paper
Issue:Volume: GPU for CEM      Number:      Year: 2012
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Title: Supercomputing solution of large electromagnetic problems with parallel MLFMA-FFT
File Type: Conference Paper
Issue:Volume: Advanced Numerical Techniques for Multiscale EM Wave Problems      Number:      Year: 2012
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Title: Fast Surface Integral-Equation Solutions of Metamaterial and Plasmonic Problems
File Type: Conference Paper
Issue:Volume: Advanced Integral Equation Methods      Number:      Year: 2012
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Title: Analysis and Discretization of the Yukawa-Calderon Preconditioned CFIE
File Type: Conference Paper
Issue:Volume: Advanced Integral Equation Methods      Number:      Year: 2012
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Title: An Adaptive Time-Stepping Algorithm in Weakly Coupled Electro-Thermal 2D-FE Modeling
File Type: Conference Paper
Issue:Volume: Multi-Physics Modeling and Simulations      Number:      Year: 2012
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Title: Physical Modeling of a Parasitic Net Area Check (NAC) Tie-Down Diode for De-embedding
File Type: Conference Paper
Issue:Volume: EM Applications in Sonnet      Number:      Year: 2012
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Title: E-Shaped High Gain Microstrip Patch Antenna
File Type: Conference Paper
Issue:Volume: Student Projects in Sonnet      Number:      Year: 2012
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Title: Mortar Element Method for the Integral Equation Based Modeling of Scattering by Perfect Electrical Conductors
File Type: Conference Paper
Issue:Volume: Advanced Integral Equation Methods      Number:      Year: 2012
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Title: A 60GHz Aperture-Coupled Micromachined Microstrip Antenna for Heterogeneous 3D Integration (System-In-Package)
File Type: Conference Paper
Issue:Volume: System-on-Package (SoP) Wireless Components      Number:      Year: 2011
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Title: Tuning Space Mapping for Microwave Design Optimization
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulations using Sonnet      Number:      Year: 2011
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Title: The Method of Auxiliary Sources for Solving Low-Frequency Electromagnetic Induction Problems in Underwater Environments
File Type: Conference Paper
Issue:Volume: New Electromagnetic Techniques and Measurements      Number:      Year: 2011
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Title: Low-Frequency Response of a Sphere Embedded in Water
File Type: Conference Paper
Issue:Volume: Numerical Techniques for Electromagnetic Applications      Number:      Year: 2011
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Title: Extraction of the Complex Permittivity of Dispersive Materials with a Stochastic Optimization Technique
File Type: Conference Paper
Issue:Volume: Nondestructive Evaluation and Materials Characterization      Number:      Year: 2010
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Title: Co-Simulation Based Tuning Space Mapping with FEKO for Computationally Efficient Optimization of Microwave Structures
File Type: Conference Paper
Issue:Volume: EM Simulations Using FEKO      Number:      Year: 2010
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Title: A Parallelized Quasi-Monte Carlo Algorithm for The Extraction of Partial Inductances in IC Interconnect Structures
File Type: Conference Paper
Issue:Volume: Recent Advances in Integral Equations and Fast Methods      Number:      Year: 2010
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Title: Spectral Properties and Regularization of Loop, Star, and Tree Related Gram Matrices
File Type: Conference Paper
Issue:Volume: Recent Advances in Integral Equations and Fast Methods      Number:      Year: 2010
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Title: Physical bounds on the partial realized gain
File Type: Conference Paper
Issue:Volume: Small Antennas - I      Number:      Year: 2010
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Title: Accurate Modeling of Microwave Devices Using Space Mapping and Kriging
File Type: Conference Paper
Issue:Volume: Advances in Simulation-Based Modeling and Design Optimization      Number:      Year: 2010
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Title: Secure RFID Communications
File Type: Conference Paper
Issue:Volume: RFIday 2010      Number:      Year: 2010
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Title: Ultra-Wideband Offset Bicone/Dipole Antenna: Simulations and Measurements
File Type: Conference Paper
Issue:Volume: Antenna Modeling      Number:      Year: 2009
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Title: A Framework for Optimization and Statistical Analysis of On-chip Passive Devices
File Type: Conference Paper
Issue:Volume: Computational Electromagnetic Methods of Significantly Reduced Complexity for High-Speed IC Design      Number:      Year: 2009
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Title: Microwave Design Optimization Using Implicit Space Mapping with Adaptive Selection of Preassigned Parameters
File Type: Conference Paper
Issue:Volume: Optimization Methods for Electromagnetics      Number:      Year: 2009
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Title: Automated Tuning Space Mapping Implementation for Rapid Design Optimization of Microwave Structures
File Type: Conference Paper
Issue:Volume: Microwave Modeling and CAD      Number:      Year: 2009
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Title: Appropriate Choice of Trial Functions for Efficient Modeling of Asymmetric Coplanar Structures
File Type: Conference Paper
Issue:Volume: Microwave Modeling and CAD      Number:      Year: 2009
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Title: A New Parallelized Floating Random-Walk Algorithm for the Modified Helmholtz Equation Subject to Neumann and Mixed Boundary Conditions: Validation with a 1D Benchmark Problem
File Type: Conference Paper
Issue:Volume: Parallelized Computing for Accelerated EM Applications      Number:      Year: 2009
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Title: A mode selecting eigensolver for 2D FIT models of waveguides
File Type: Conference Paper
Issue:Volume: Fast and Efficient Methods for Transmission Lines and Waveguides      Number:      Year: 2009
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Title: Left-Handed Media as a Tool to Determine Scatterer Location
File Type: Conference Paper
Issue:Volume: Wave Propagation in Metamaterials and Nanostructures      Number:      Year: 2009
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Title: 25 Years of Progress and Future Challenges in Boundary-Element Based Field-Circuit and Multiphysics Solvers
File Type: Conference Paper
Issue:Volume: 25 Years of Progress and Future Challenges in Applied Computational Electromagnetics II      Number:      Year: 2009
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Title: Normalized Surface Magnetic Source Model Applied to Camp Sibert Data Sets: Discrimination Studies
File Type: Conference Paper
Issue:Volume: Low-Frequency Computational Electromagnetics      Number:      Year: 2009
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Title: Using the Feature Selective Validation Technique to Compare Data Sets
File Type: Conference Paper
Issue:Volume: Advances in Numerical EM and Propagation Tools      Number:      Year: 2009
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Title: Breast Skin Effect on Scattered Electromagnetic Fields
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2008
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Title: An hp-Adaptive Discontinuous Galerkin Method in Time Domain Applied to the Simulation of Highly Localized Current Sources
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2008
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Title: Breast Skin Effect on Scattered Electromagnetic Fields
File Type: Conference Paper
Issue:Volume: Microwave Imaging and Inverse Problems      Number:      Year: 2008
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Title: Data-Derived Generalized SEA Applied to MPV TD Data
File Type: Conference Paper
Issue:Volume: Microwave Imaging and Inverse Problems      Number:      Year: 2008
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Title: Investigation of Signal Integrity in On-Chip Antennas
File Type: Conference Paper
Issue:Volume: Antenna Modeling and Small Antennas      Number:      Year: 2008
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Title: An hp-Adaptive Discontinuous Galerkin Method in Time Domain Applied to the Simulation of Highly Localized Current Sources
File Type: Conference Paper
Issue:Volume: Finite-Volume and Discontinuous Galerkin Time-Domain Techniques      Number:      Year: 2008
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Title: Space Mapping Optimization of Microwave Structures with FEKO
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling using FEKO – I      Number:      Year: 2008
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Title: Adaptive Mixed-Order FDTD Techniques on a Non-uniform Mesh
File Type: Conference Paper
Issue:Volume: Recent Developments and Applications with Time-domain Modeling Techniques      Number:      Year: 2008
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Title: Coarse Models for Microwave Design Optimization with Space Mapping
File Type: Conference Paper
Issue:Volume: Advanced Optimization Methodologies for Engineering Design      Number:      Year: 2008
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Title: A Space Mapping Methodology for Defect Characterization
File Type: Conference Paper
Issue:Volume: Advanced Optimization Methodologies for Engineering Design      Number:      Year: 2008
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Title: Simulation of Frequency Agile RF MEMS Antennas Using WIPL-D
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling by WIPL-D Software      Number:      Year: 2008
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Title: Statistical Analysis of Multi-Antenna Channel Capacity in the Urban Microcell Scenario
File Type: Conference Paper
Issue:Volume: Antenna Systems for Future Wireless Communications      Number:      Year: 2008
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Title: Capacity of an Antenna System in the Transmission Mode with Near-field Effects
File Type: Conference Paper
Issue:Volume: Antenna Systems for Future Wireless Communications      Number:      Year: 2008
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Title: Space Use Radial Line Slot Antenna with Honeycomb Structure
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2007
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Title: A Statistical Toolkit For Validation
File Type: Conference Paper
Issue:Volume: New Techniques for Computational Electromagnetic Validation      Number:      Year: 2007
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Title: Ultra-Wideband Low Profile, U-Slot Microstrip Patch Antennas: L-Probe Feed Design Guidelines
Abstract: The need for low-profile and ultra-wideband (UWB) antennas is rising in wireless communication and medical applications. The method of dimensional invariance, which is a class of U-slot patch design methods, is utilized to realize an initial, low-profile, wideband design. Building on this initial wideband design, this study establishes ideal L-probe feed dimensions through extensive parametric study on ?r = 2.2 and 4.5 substrates to propose empirical guidelines for the design of L-probe feeds which yield first-pass optimum impedance bandwidth. The established ideal L-probe dimensions, after further extrapolation, are used successfully on other substrates, ?r = 3.27, 6.0 and 9.2, for the design of first-pass L-probe feeds which yield impedance bandwidth over 55%, 60%, and 53%, respectively. The results of three commercially available EM simulation solvers show good agreement.
Author(s): M. M. Elsewe, V. K. Dandu, D. Chatterjee
File Type: Journal Paper
Issue:Volume: 31      Number: 11      Year: 2016
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Title: Small-Size Tapered Slot Antenna (TSA) Design for use in 5G Phased Array Applications
Abstract: The design and development of a compact tapered slot antenna (TSA) for the fifth generation (5G) phased array communications is described in this manuscript. The proposed low-profile TSA element is designed on a Rogers RT 5880 (?=2.2 and ?=0.0009) dielectric to work in the frequency range from 21 to 23 GHz. The configuration of the employed TSA antenna elements is composed of a slot-line flare from a small gap to a large opening, matching to free space’s wave impedance. Eight TSA elements with well-defined endfire radiation patterns have been used on the top portion of a mobile-phone PCB to form a 1×8 linear phased array. The TSA elements are fed by hockey-stick baluns. In addition, the radiation performance and SAR characteristics of the phased array 5G antenna in the vicinity of user’s hand & head have been investigated in this study. The results show that the proposed design provides good characteristics in terms of S-parameters, antenna gain, efficiency, SAR, and beam steering, which fit the need of 5G cellular communications.
Author(s): N. O. Parchin, M. Shen, G. F. Pedersen
File Type: Journal Paper
Issue:Volume: 32      Number: 3      Year: 2017
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Title: Simulating Improved Antenna Performance using Measured Data of Electrically Thin Antennas
File Type: Conference Paper
Issue:Volume: S17 Computational Electromagnetics, Advanced Algorithms and Emerging Applications/ High Performance Computing in Electromagnetics      Number:      Year: 2020
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Title: Printed UWB Pacman-Shaped Antenna with Two Frequency Rejection Bands
Abstract: In this paper, the design and analysis of microstrip-fed low-profile, compact ultra-wideband (UWB) monopole antenna with two band-notches characteristics is carried out. The antenna is mounted on a low-cost FR-4 substrate with dimensions of 25×38×1.6 mm3, and relative permittivity of 4.4. The original shape of the patch is circular with radius of 11.5 mm, and then a sector is removed from the patch (making it a Pacmanshaped antenna) to improve the impedance bandwidth. The proposed antenna provides an impedance bandwidth between 2.9-15 GHz with better than 10 dB return loss and has nearly an omni-directional radiation pattern. Additionally, the antenna can reject the interference from WiMAX (3.5 GHz center frequency) and WLAN (5.5 GHz center frequency).
Author(s): S. Naser, N. Dib
File Type: Journal Paper
Issue:Volume: 32      Number: 3      Year: 2017
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Title: Platform Tolerant and Conformal RFID Tag Antenna: Design, Construction and Measurements
Abstract: This paper presents the design of a novel platform tolerant and conformal RFID (Radio Frequency Identification) tag antenna, which operates at the 902–928 MHz UHF band. The antenna has a simple, low-profile (1.8 mm thick) structure. It consists of two microstrip patches, which are separated by a narrow gap and driven by a microchip in the gap. The tag is designed to complex conjugate match an Alien- Higgs2 microchip. The performance of the tag is investigated on different surfaces (free space, human and metal) through simulations using parameters like power reflection coefficient, input impedance and radiation patterns. The effects of bending are investigated on the tag design. Experimental read-range, radiation pattern and impedance measurements are performed for the tag. High Frequency Structure Simulator (HFSS) simulation validation has been achieved due to excellent agreement with measurements for this particular application. The experimental measurements show that the maximum boresight average read range of the designed RFID tag on different platforms is about 3.5m (4 W EIRP).
Author(s): H. Rajagopalan, Y. Rahmat-Samii
File Type: Journal Paper
Issue:Volume: 25      Number: 6      Year: 2010
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Title: Passive Fractal Chipless RFID Tags Based on Cellular Automata for Security Applications
Abstract: In this paper, we propose a novel design of low-profile fractal chipless tags with unique specific electromagnetic responses. The tags are designed using cellular automata (Game of Life) technique to ensure the randomness of the generated fractal tags. The tags are simulated in CST Microwave Studio for the frequency range of 2 to 10 GHz. The tags are realized on FR4 substrate and their radar cross-section (RCS) characteristics are analyzed for the nine different tags for the three different polarizations (horizontal, vertical, and oblique). Each tag shows a unique signature resonance response. The obtained results of coding capacity (16-20 bits), coding spatial capacity (1-1.25 bits/cm2), coding spectral capacity (2.15-2.9 bits/GHz), and coding density (0.15-0.18 bits/GHz x cm2) of realized tags are very good. The presented tags could be used for the development of secure RFID systems.
Author(s): M. N. Zaqumi, J. Yousaf, M. Zarouan, M. A. Hussaini, H. Rmili
File Type: Journal Paper
Issue:Volume: 36      Number: 5      Year: 2021
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Title: Multi-Band Printed Meandered Loop Antennas for Wireless Routers with MIMO Implementation
File Type: Conference Paper
Issue:Volume: Antenna Design, in memory of Stan Kubina      Number:      Year: 2013
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Title: Modeling and Validation of a Low-Profile Circularly Polarized Antenna Developed Using FEKO
File Type: Conference Paper
Issue:Volume: FEKO Modeling and Analysis IV      Number:      Year: 2009
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Title: Metamaterial-Based Low-Profile Broadband Hexagonal-Grid-Slotted Patch Antenna
File Type: Conference Paper
Issue:Volume: 2-P2-E Antennas with Advanced/Artificial Materials and Processes      Number:      Year: 2017
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Title: Low-profile Wideband Slot-loaded Dipole for Base Station Antenna Element
File Type: Conference Paper
Issue:Volume: 4-1-B Advanced Antenna Designs and RF Measurement Techniques      Number:      Year: 2017
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Title: Low-profile Normal-Mode Helical Antenna for Use in Proximity to Metal
Abstract: To expand the applicability of UHF tags, a low-profile, small, normal-mode helical antenna (NMHA) that can be used on metallic plates was developed. This paper clarifies the design method for antenna structures for use in proximity to metal. The design data were obtained with the electromagnetic simulator FEKO. Fundamental electrical characteristics such as the antenna input impedances, self-resonance conditions, and radiation characteristics were clarified in proximity to metal. For antenna sizes of 0.03–0.05 wavelengths, antenna gains of about –0.5 dBd were achieved. The calculated results were verified using an actual antenna (size, 0.04 wavelengths). A tap feed structure was used for impedance matching. It was shown that very precise design results could be achieved. Moreover, the developed NMHA was designed to be a tag antenna. Here, the antenna impedance was matched to the IC chip impedance. The read range of the developed tag was measured to be about 15 m.
Author(s): W. Hong, N. Michishita, Y. Yamada
File Type: Journal Paper
Issue:Volume: 25      Number: 3      Year: 2010
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Title: Low-profile Hybrid-mode Antenna Providing Near-hemispherical Field-of-view Coverage
Abstract: The hybrid-mode model (HMM) combining monopole and dipole radiation modes can provide near-hemispherical coverage but has a high profile. To reduce the profile of HMM, a modified HMM is presented in this paper using a dipole radiator and a magnetic current loop radiator. Based on the modified model, a low-profile on-board antenna is proposed. When the side length of the ground is infinite, the 3-dB beamwidths in the xz plane and yz plane of the proposed antenna are both 180°. When the side length of the ground is finite, the proposed antenna can provide a near-hemispherical field-of- view coverage. The design example demonstrates the practicability of the modified HMM and the proposed antenna can be used in wide-angle scanning arrays and rich-multipath communication systems.
Author(s): R. Wang, B.-Z. Wang, X. Ding, C. Hu
File Type: Journal Paper
Issue:Volume: 32      Number: 9      Year: 2017
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Title: Low-Profile Dual-Band Emulated GPS Constellation Antenna
File Type: Conference Paper
Issue:Volume: S07 Novel Antennas for Upstream and Downstream Satellite Applications      Number:      Year: 2017
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Title: Low-Profile Broadband Top-Loaded Triangular Antenna with Folded Rim
Abstract: This paper presents the impedance matching technique and the bandwidth characteristics of a low-profile top-loaded triangular antenna with oblique shorting pins. The folded rim is arranged at the edge of the finite ground plane. The bandwidth diagrams for various antenna heights, finite sizes of the ground plane, and the widths of the folded rim are obtained through the moment-method simulation. The maximum bandwidth of 43 % is achieved with 0.05 ? height. For the low-profile configuration, the bandwidth of 17 % is obtained with 0.03 ? height.
Author(s): N. Michishita, W. J. Kim, Y. Yamada
File Type: Journal Paper
Issue:Volume: 28      Number: 2      Year: 2013
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Title: Low-Profile Asymmetrical-CSRR-Loaded Stacked Microstrip Patch Antenna
Abstract: By introducing an asymmetrical-CSRRloaded parasitic patch beneath the radiating patch of a traditional low-profile microstrip antenna, a novel stacked antenna with both 22.46% fractional bandwidth, and stable and uniform radiation patterns in the entire operating frequency range is achieved, even the total height is only approximate 0.04?L (where ?L indicates the free-space wavelength corresponding to the lower bound of the operating frequency band). The antenna is designed, fabricated and tested. The experimental results agree with the simulations.
Author(s): M.-C. Tang, T. Shi, H. Xiong, S. Qing
File Type: Journal Paper
Issue:Volume: 30      Number: 8      Year: 2015
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Title: Low Profile Magneto-Dielectric Ground Plane for Ultra-Wideband Antennas
File Type: Conference Paper
Issue:Volume: Electromagnetic Modeling using FEKO - II      Number:      Year: 2008
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Title: Internal Network Boundary Condition Incorporated in FDTD to Efficiently Modeling Low-profile Periodic Structure
File Type: Conference Paper
Issue:Volume: 4-3-A Advances in FDTD      Number:      Year: 2017
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Title: In-Situ Simulation of Collision Avoidance Antenna in Vehicle-Mounted Environment
File Type: Conference Paper
Issue:Volume: FEKO Modeling and Analysis II      Number:      Year: 2009
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Title: Four-Element Planar MIMO Antenna for Indoor Communications with High Isolation
Abstract: A low-profile monopole microstrip antennas with multiple-input-multiple-output (MIMO) configuration for a 4G/5G communication terminal is presented. The MIMO antenna system consists of four elements that operate in the LTE1800/2600 and GSM1800 bands. The antenna elements are mounted along the four sides of a rectangular ground plane of size 120×100 mm2. Spatial diversity technique and a modified ground plane are used to enhance isolation between elements. To mitigate the mutual coupling effect, the lower corners of the ground plane have been truncated. The measured isolation is lower than -17 dB between any two elements over the operating frequency bands. The total efficiency ranges from 69% to 83% and from 73% to 86% over LTE1800 and LTE2600 bands, respectively. The diversity performance of the measured envelope correlation coefficient (ECC) and radiation patterns meet the diversity criteria for 4/5G networks.
Author(s): M. M. Morsy
File Type: Journal Paper
Issue:Volume: 34      Number: 12      Year: 2019
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Title: FEKO Simulation of Multi-Resonant Low-Profile PIFA
File Type: Conference Paper
Issue:Volume: S16 EM Modeling using FEKO      Number:      Year: 2015
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Title: FEKO Simulation of Multi-Resonant Low-Profile PIFA
Abstract: A passive, low-profile multi-resonant planar-inverted-F antenna (PIFA) element well-suited for portable communications is presented. The antenna combines the optimal low-profile geometry of a planar inverted-F antenna with a double-tuned structure to create a multi-resonant element with monopole-class radiation properties. The form factor and overall dimensions are held constant for comparisons to a similar single-resonant antenna in different near-field environments.
Author(s): C. W. Hearn, W. A. Davis
File Type: Journal Paper
Issue:Volume: 30      Number: 10      Year: 2015
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Title: FE-BI Analysis of a Leaky-Wave Antenna with Resistive Sheet Termination
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2012
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Title: Development of Wideband Random Phased Arrays Composed of Modified Canted Sector Antennas
File Type: Conference Paper
Issue:Volume: Phased Array and Active Antennas      Number:      Year: 2005
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Title: Design of a Low-Profile Wideband Patch Antenna with L-Shaped Feeding Mechanism
File Type: Conference Paper
Issue:Volume: 9-P-2 Poster      Number:      Year: 2018
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Title: Design of a Low-Profile 2 to 6 GHz Circular Polarized Single Arm Hexagonal Spiral Array Antenna
File Type: Conference Paper
Issue:Volume: S11 Antenna Design I      Number:      Year: 2017
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Title: Compact, Low-Profile, Bandwidth-Enhanced Substrate Integrated Waveguide Filtenna
File Type: Conference Paper
Issue:Volume: 11-WA-6 Low Profile and Wideband Antennas      Number:      Year: 2018
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Title: Calculation of Dual Leaky-wave Antenna Performance using Quad-core Processors and OpenMP
File Type: Conference Paper
Issue:Volume: Advancements in Finite-Element Analyses      Number:      Year: 2008
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Title: CADFEKO Curve Primitive Geometry Functions to Create a Reduced-Drag, Low-Profile Wideband Antenna
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using FEKO      Number:      Year: 2011
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Title: Broadband and Low-profile Microstrip Antennas with Periodical Structures
File Type: Conference Paper
Issue:Volume: 11-WA-6 Low Profile and Wideband Antennas      Number:      Year: 2018
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Title: Artificial Magnetic Conductors for Wideband Antenna Applications
File Type: Conference Paper
Issue:Volume: Numerical Challenges in Modeling Metamaterials      Number:      Year: 2007
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Title: An Ultra-Wideband Absorber Backed Planar Slot Antenna
File Type: Conference Paper
Issue:Volume: S16 EM Modeling using FEKO      Number:      Year: 2015
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Title: An Ultra-Wideband Absorber Backed Planar Slot Antenna
Abstract: Planar antenna designs have many advantages such as low-profile, light-weight, and ease of fabrication and integration. Here, a planar slot antenna implemented on ceramic substrate with coplanar waveguide feed is considered. With absorber loading the design provides 50 ? input impedance over the frequency range 0.3–3 GHz so it is considered ultra-wideband. This paper summarizes a numerical investigation using both frequency and timedomain solvers. The results serve to guide the future analysis of broadband antennas with lossy dielectric loading for ground penetrating radars. The evaluation of radar performance requires further simulation and model validation based on antenna measurements.
Author(s): W. O. Coburn
File Type: Express Journal Paper
Issue:Volume: 1      Number: 1      Year: 2016
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Title: An Ultra-Wideband Absorber Backed Planar Slot Antenna
Abstract: Planar antenna designs have many advantages such as low-profile, light-weight, and ease of fabrication and integration. Here, a planar slot antenna implemented on ceramic substrate with coplanar waveguide feed is considered. With absorber loading the design provides 50 omega input impedance over the frequency range 0.3–3 GHz so it is considered ultra-wideband. This paper summarizes a numerical investigation using both frequency and timedomain solvers. The results serve to guide the future analysis of broadband antennas with lossy dielectric loading for ground penetrating radars. The evaluation of radar performance requires further simulation and model validation based on antenna measurements.
Author(s): W. O. Coburn
File Type: Express Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: An Ultra-Wideband Absorber Backed Planar Slot Antenna
Abstract: Planar antenna designs have many advantages such as low-profile, light-weight, and ease of fabrication and integration. Here, a planar slot antenna implemented on ceramic substrate with coplanar waveguide feed is considered. With absorber loading the design provides 50 omega input impedance over the frequency range 0.3–3 GHz so it is considered ultra-wideband. This paper summarizes a numerical investigation using both frequency and timedomain solvers. The results serve to guide the future analysis of broadband antennas with lossy dielectric loading for ground penetrating radars. The evaluation of radar performance requires further simulation and model validation based on antenna measurements.
Author(s): W. O. Coburn
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: An Ultra-Wide Bandwidth Absorber Based on Tightly Coupled Array
File Type: Conference Paper
Issue:Volume: 1-P1-A Student Paper Contest      Number:      Year: 2017
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Title: An I-C Shaped Via-Patch Antenna with High Directivity and Wideband for RFID Tag Mounted on Metallic Surface
File Type: Conference Paper
Issue:Volume: S50 Antenna and Array Technologies for Modern Smart Radar      Number:      Year: 2021
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Title: A Novel Symmetric Cascaded Frequency Selective Surface wtih Butterworth Response In X-Band
File Type: Conference Paper
Issue:Volume: 3-P3-E Perodic Structures      Number:      Year: 2017
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Title: A Miniaturized, Low-Profile, Self-Actuated Radome for EM Protection
File Type: Conference Paper
Issue:Volume: 3-P3-E Perodic Structures      Number:      Year: 2017
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Title: A Low-Profile, Dual-Polarized Base-Station Antenna with FSS Loading
File Type: Conference Paper
Issue:Volume: 11-WA-1 Antenna Designs, Simulations, and Measurements for 5G Applications      Number:      Year: 2018
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Title: A Low-Profile Miniaturized Frequency Selective Surface with Insensitive Polarization
Abstract: In this letter, a low-profile miniaturized broadband bandpass frequency selective surface (FSS) is proposed. The proposed structure consists of a convoluted dipole metal layer and its complementary pattern, which are separated by a dielectric substrate with a thickness of 0.003lambda0, where lambda0 is the resonant wavelength in free space. The cell size of the proposed FSS is only 0.03lambda0 × 0.03lambda0. Furthermore, 3 dB bandwidth of the proposed FSS is approximately 50% for the normal incidence. Low profile and miniaturization of the structure element contribute to the great stability of frequency response under the incident waves with different incident angles and polarizations. To better understand the operational principle of the proposed FSS, the equivalent circuit model is presented. The proposed FSS prototype was fabricated and measured to validate the design.
Author(s): M. Wang, L. Zhao, J. Wang, X. Liang, S. Zhang, Y. Li, W. Yu
File Type: Journal Paper
Issue:Volume: 33      Number: 9      Year: 2018
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Title: A Low-Profile Dual-Polarized Crossed Dipole Antenna on AMC Surface
Abstract: A low-profile dual-polarized crossed dipole antenna on artificial magnetic conductor (AMC) surface is presented in this paper. The antenna consists of two orthogonal dipoles, a periodic arrangement of artificial magnetic conductors and a ground floor. The antenna has a section height of only 13mm (0.13λ0, λ0 is the wavelength in free space at 3 GHz). With utilizing the 6×6 unit cell of square patch based AMC, the antenna can achieve a wide band. To verify this design, a prototype of this antenna is designed, fabricated and measured. Measured results exhibit that bandwidth from 2.9 GHz to 3.32 GHz (S11< -10dB) for one port and from 2.995 GHz to 3.47 GHz (S22< -10dB) for another port are obtained, respectively. Meanwhile, the isolation between two ports is less than -30 dB, and stable radiation patterns are realized in operating frequency band.
Author(s): R. He, Z.-H. Yan, Y.-B. Meng
File Type: Journal Paper
Issue:Volume: 34      Number: 7      Year: 2019
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Title: A Low-Profile Circularly Polarized Magnetic-Electric Dipole Antenna Array
Abstract: A low-profile circularly polarized (CP) magneto-electric dipole (MED) antenna array is presented in this paper. By tilting the vertical walls of a MED with two protruded stubs being orthogonal to the horizontal patches and by using a staircase-shaped feeding strip, a wideband CP MED antenna is formed. In comparison to the conventional MED, the profile of the antenna is reduced from 0.25λc to only 0.07λc at the center frequency of the operating band. The sequentially rotated feeding (SRF) network is employed to construct a 2×2 array with enhanced 3 dB axial-ratio (AR) bandwidth. The overall size of the array is as compact as 1.33λc×1.33λc×0.07λc, and the measured results show that the usable overlapped bandwidth of the reflection coefficient |S11|< -10 dB and AR< 3 dB is 31.2%, covering 1.76 GHz to 2.41 GHz. The peak gain of the array is 12.9 dBic with the gain variation being less than 3 dB within the 1.85-2.32 GHz band, and the front-backratio (FBR) is greater than 20 dB. The proposed array is promising in the applications for portable and individual communication devices for wireless communications.
Author(s): P. Zhou, M. He, W. Tian, C. Zhang
File Type: Journal Paper
Issue:Volume: 34      Number: 12      Year: 2019
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Title: A Low-Profile Broadband Circularly Polarised Wide-Slot Antenna with an Artificial Magnetic Conductor Reflector
Abstract: In this letter, a novel broadband circularly polarisation (CP) wide-slot antenna with an artificial magnetic conductor (AMC) as the reflector is presented. The wide-slot antenna is composed of a knife-shaped radiator and an improved ground plane. A broadband CP characteristic can be achieved by slotting the ground plane to make it an asymmetric ground shape. However, the average gain of the wide-slot antenna is only about 3 dBic because of bidirectional radiation. An AMC reflector is adopted to enhance the gain of the wide-slot antenna without introducing a high profile similar to the PEC reflector. In addition, the four metal plates are vertically placed around the antenna to broaden the axial ratio (AR) bandwidth of the antenna with the AMC reflector. The measurement results show that the 3dB AR bandwidth of the proposed CP antenna is 32.4% (2.35GHz─3.26GHz), the average gain is 6.5dBic in the AR bandwidth and the value of VSWR in the AR bandwidth is less than 2. The size of the antenna is 0.84λ0× 0.84λ0× 0.13λ0 at the centre frequency of 2.805 GHz. The proposed antenna has a low profile, broad AR bandwidth and high gain, thereby being a good candidate for various wireless communication systems.
Author(s): F. Fan, X. Fan, X. Wang, Z. Yan
File Type: Journal Paper
Issue:Volume: 36      Number: 6      Year: 2021
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Title: A Low-Profile and Beam-tilted Continuous Transverse Stub Array Antenna at W-band
Abstract: This paper presents a low-profile, high gain, beam-tilted continuous transverse stub (CTS) array antenna at W-band. The antenna compromises 32 radiating slots and is fed by a parallel plate waveguide (PPW) network with a linear source generator. To deflect the outgoing beam, the principle of linear array scanning is adopted to design inverted T-type structure in each stub to introduce wave path difference. PPW network allows the antenna to obtain lower profile compared to other transmission lines. The design procedure, and the antenna characterization are described. The main beam of the antenna is titled 12 degree in H-plane. The simulation and measured results show that this antenna achieves peak gain of 32.4 dB and a 12 degree beam tilt angle at 99GHz. S11 parameters of the antenna is less than -10 dB in a broadband from 96 GHz to 103 GHz. This antenna has an advantage of miniaturization over other high-gain antenna solutions. The promising performance of this proposed CTS antenna reveals the possible candidate for Millimeter wave (MMW) telecommunication applications.
Author(s): D. Chu, Y. Xiong, P. Li
File Type: Journal Paper
Issue:Volume: 36      Number: 7      Year: 2021
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Title: A Flush-mounted Ultra-wideband Scanning Phased Array with End-fire Radiation Pattern
File Type: Conference Paper
Issue:Volume: 4-MP-4 Student Paper Competition I      Number:      Year: 2018
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Title: A Conformal Low-profile Series-fed Microstrip Array for Aircraft Applications
File Type: Conference Paper
Issue:Volume: 4-P4-B Antennas      Number:      Year: 2017
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Title: A Compact, Low-Profile Dual-Band Patch Filtering Antenna for Off-Body Communications
File Type: Conference Paper
Issue:Volume: 11-WA-5 Microwave and Antenna Technology for Wireless Body-Centric Systems      Number:      Year: 2018
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Title: A Compact Low-profile C-band Dual Circularly Polarized Sub-array Antenna
File Type: Conference Paper
Issue:Volume: 4-P4-B Antennas      Number:      Year: 2017
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Title: A Compact and Low-Profile Wideband Circularly-Polarized Slot Antenna Fed by Coplanar Waveguide and Microstrip Line
File Type: Conference Paper
Issue:Volume: S38 Antenna Applications II      Number:      Year: 2015
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Title: A Broadband Microstrip-Fed Patch Antenna with Harmonic Suppression
File Type: Conference Paper
Issue:Volume: 11-WA-6 Low Profile and Wideband Antennas      Number:      Year: 2018
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Title: Study on Fabry-Perot Antennas Using Dipole Exciters
Abstract: Fabry-Pérot (F-P) cavity antennas with Artificial Magnetic Conductor (AMC) ground planes and Frequency Selective Surface (FSS) superstrates have been investigated in this paper. The method of periodic imaging is used to analyze the cavity antennas, and we can calculate the working frequency and quality factor. One or two dipole antennas are utilized to excite the cavity antennas. The results demonstrate that the gain will be enhanced with the increase of the cavity size, and two exciters in the cavity will improve radiation efficiency obviously.
Author(s): Y. Zhang, W. Yu, W. Li
File Type: Journal Paper
Issue:Volume: 29      Number: 12      Year: 2014
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Title: Size Reduced Array Antenna with Enhanced Directivity
Abstract: Small array antennas with directive coverage are an attractive solution for size limitation in wireless devices. In this paper, the design of a directive 10 GHz antenna with reduced size microstrip array and frequency selective superstrate (FSS) is presented. Inductive loading and reduced patch separation is used to incorporate 7-elements within a 100x30 mm2 array aperture. The superstrate (FSS) layer is optimized to properly excite the Fabry-Perot cavity and further increase the antenna directivity. Using HFSS software, the reflection response and the radiation pattern of the antenna array is optimized. The simulated responses agreed well with the measured results.
Author(s): S. S. I. Mitu, F. Sultan
File Type: Journal Paper
Issue:Volume: 30      Number: 11      Year: 2015
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Title: High-gain Wideband Fabry-Perot Resonator Antenna Based on Single-layer FSS Structure
File Type: Conference Paper
Issue:Volume: 2-SE-2 Electromagnetic Characteristics of Complex Media Simulated by Time Domain Method II      Number:      Year: 2018
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Title: High-gain Wideband Fabry-Perot Resonator Antenna Based on Single-layer FSS Structure
Abstract: In this paper, a wideband Fabry-Perot (FP) resonator antenna is designed based on single-layer frequency selective surface (FSS) structure. The antenna adopts a single-layer complementary circular FSS structure as the partially reflecting surface (PRS) of Fabry-Perot resonator antenna to improve the gain. The wideband slot-coupled patch antenna is used as the source. The proposed FSS maintains a positive slope reflection phase gradient in the band of 10.3-16.0 GHz, which satisfies the realization conditions of the wideband Fabry-Perot resonator antenna. The measured results show that the 10-dB impedance matching bandwidth of the proposed Fabry-Perot resonator antenna covers 11.99-15.54 GHz (25.8%), the maximum gain is 13.16 dBi at 14.2 GHz, and the 3-dB gain bandwidth is 26.1%. The measurement results verify the feasibility of the design method.
Author(s): Z. Liu, S. Liu, X. Kong, Z. Huang, X. Zhao
File Type: Journal Paper
Issue:Volume: 34      Number: 6      Year: 2019
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Title: High Gain Fabry-Perot Cavity Antenna With Phase Shifting Surface
File Type: Conference Paper
Issue:Volume: S53 Antenna and Arrays IV      Number:      Year: 2016
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Title: Design of Tilted-Beam Fabry-Perot Antenna with Aperiodic Partially Reflective Surface
Abstract: A fast synthesis model for designing highgain tilted-beam antennas with the aperiodic partially reflective surface (PRS) is presented in this paper. In this model, concepts of array synthesis and thinning are introduced to realize the tilted beam and control the sidelobe level (SLL). Since a large number of data need to be processed during the optimization process, an efficient hybrid real-binary bat algorithm (HRBBA) is proposed and embedded in the model to optimize the loop widths and the absence of the square loops on the PRS. As an example, an antenna with an expected tilted beam in the elevation plane (? = 40°) is manufactured and measured, and both the simulated and measured results show that the antenna can tilt its beam toward the expected direction with good performance.
Author(s): Y.-F. Cheng, W. Shao, X. Ding, M.-X. Yu
File Type: Journal Paper
Issue:Volume: 32      Number: 5      Year: 2017
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Title: Time-modulated Coupled-cavity System for Optical Switching
File Type: Conference Paper
Issue:Volume: S07 Time Domain Modeling of Switchable and Tunable Devices in Photonics      Number:      Year: 2020
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Title: Time-modulated Coupled-cavity System for Optical Switching
Abstract: The scattering parameters of a time-modulated twocoupled- cavity system are obtained using coupled mode theory and verified using the finite-difference time-domain method. We find that a suitably tailored time-modulation of the cavities allows for switching the output on and off. The proposed functionality can be used in direct amplitude modulation of an optical carrier from a frequency-modulated RF message.
Author(s): A. Mock
File Type: Journal Paper
Issue:Volume: 35      Number: 11      Year: 2020
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Title: The Use of Offset Coupled Microstrip Combline Filters for IF Filters Requiring High Selectivity
File Type: Conference Paper
Issue:Volume: EM Simulations Using Sonnet - II      Number:      Year: 2010
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Title: The Isolation Island and the Displacement of Decoupling Capacitors for Power Integrity Issues
File Type: Conference Paper
Issue:Volume: Electromagnetic Compatibility and Interference      Number:      Year: 2005
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Title: Supercavity Modes in Dielectric Resonators Excited by Two Current Sources
File Type: Conference Paper
Issue:Volume: S35 Advanced Time-Domain Numerical Methods For Nonlinear and Quantum Optics with Engineered Materials - II      Number:      Year: 2021
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Title: Study on the Matrix Pencil Method with Application to Predict Time-domain Response of a Reverberation Chamber
Abstract: The full wave simulation of reverberation chamber in time domain usually takes large computational time because of its resonant characteristic. This contribution makes the pioneer exploration of accelerating this kind of simulation by time-domain signal prediction. The prediction technique is based on the well known matrix pencil method (MPM). An approximation to the existing MPM is proposed to obtain a new kind of MPM, which is more computationally efficient. To conduct the prediction effectively, the signal’s oversampling should be avoided and the singular values appeared in MPM should be judged appropriately. The signal can be resampled according to Nyquist sampling law while the singular values can be selected by the newly proposed criterion based on cavity theory. For wideband time-domain responses, it is suggested to apply digital band-pass filter before prediction to get higher precision. Using the proposed methods, the computational time can be reduced almost 50 % for the reverberation chamber’s FDTD simulation.
Author(s): S. Wang, Z. C. Wu, L. Du, G. H. Wei, Y. Z. Cui
File Type: Journal Paper
Issue:Volume: 28      Number: 9      Year: 2013
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Title: Study on Electromagnetic Properties of Sodium Chloride in Microwave Drying
File Type: Conference Paper
Issue:Volume: 5-P-1 Poster      Number:      Year: 2018
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Title: Study of the Effects of the Back Cavity on a Broadband Sinuous Antenna and an Optimized Loaded Back Cavity
Abstract: Sinuous antennas, like spiral antennas, have wideband characteristics, such as constant beam width and low axial ratio over a broad range of frequencies, and thus they are suitable for communicating in transmitting and receiving over bands of frequencies that may encompass multiple channels. In the presence of the back cavity, the performance of the sinuous antenna is affected. The purpose of this paper is to study the affects of the back cavity, and use these findings to build an optimized lossy cavity to improve the performance of the sinuous antenna. The performance of the antenna with and without the back cavity is compared to the antenna with the optimized loaded cavity.
Author(s): S. Palreddy, A. I. Zaghoul, R. Cheung
File Type: Journal Paper
Issue:Volume: 26      Number: 8      Year: 2011
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Title: Study of The Effects of The Back Cavity on a Broadband Sinuous Antenna
File Type: Conference Paper
Issue:Volume: CEM Applications      Number:      Year: 2010
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Title: Study of Reduced Size Circular Microstrip Patch Antenna with Two-Pin Loading
File Type: Conference Paper
Issue:Volume: Recent Antenna Applications      Number:      Year: 2003
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Title: Statistical Analysis of the Normalized Impedance Matrix Derived by the Random Coupling Model
File Type: Conference Paper
Issue:Volume: Advanced Electromagnetic Modeling Methods Part II      Number:      Year: 2014
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Title: Statistical Analysis of an Electrical System within a Reverberant Cavity
File Type: Conference Paper
Issue:Volume: EMC in Complex Systems and Reverberant Environments      Number:      Year: 2013
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Title: Static and Dynamic Scattering Characteristics of Complex Cavity with Rotating Blades
File Type: Conference Paper
Issue:Volume: 8-TP-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu II      Number:      Year: 2018
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Title: Static and Dynamic Scattering Characteristics of Complex Cavity with Rotating Blades
File Type: Conference Paper
Issue:Volume: 10-TE-4 In Celebration of 70th Birthday of Prof. Jia-dong Xu III      Number:      Year: 2018
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Title: Spherical Domain Truncation for the FVTD Method
File Type: Conference Paper
Issue:Volume: Finite-Volume and Discontinuous Galerkin Time-Domain Techniques      Number:      Year: 2008
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Title: SLF/ELF Electromagnetic Field of a Horizontal Dipole in the Presence of an Anisotropic Earth-Ionosphere Cavity
Abstract: In this paper, the region of interest is a cavity between a spherical and electrically homogeneous earth and an anisotropic homogeneous ionosphere. Both the dipole (Vertical Electric Dipole (VED), Vertical Magnetic Dipole (VMD), or Horizontal Electric Dipole (HED)) and the observation point are assumed to be located on or near the spherical surface of the earth. The approximate formulas are obtained for the electromagnetic field of a vertical magnetic dipole and that of a vertical electric dipole in the presence of an anisotropic earthionosphere cavity, respectively. Based on the results obtained, the approximate formulas are derived readily for the electromagnetic field of a horizontal electric dipole in the presence of an anisotropic earth-ionosphere cavity by using a reciprocity theorem. Analysis and computations in SLF/ELF ranges are carried out specifically.
Author(s): G. Z. Li, T. T. Gu, K. Li
File Type: Journal Paper
Issue:Volume: 29      Number: 12      Year: 2014
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Title: SIW Cavity-Backed Dual-Polarized Shorted Annular Patch Antenna with High Gain
File Type: Conference Paper
Issue:Volume: 11-WA-1 Antenna Designs, Simulations, and Measurements for 5G Applications      Number:      Year: 2018
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Title: Simulation and Analysis of HEMP Coupling Effect on Wires Inside a Cylindrical Shielding Cavity with Apertures
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using Wipl-D      Number:      Year: 2011
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Title: Simulation and Analysis of HEMP Coupling Effect on a Wire Inside an Apertured Cylindrical Shielding Cavity
Abstract: High altitude nuclear electromagnetic pulse (HEMP) can damage electronic equipments of radar and communication systems. Back door coupling is one of the main ways of HEMP attacks on the electronic devices. In this paper, the three-dimensional (3D) electromagnetic (EM) simulation software MicroStripes7.5, which is based on the transmission line matrix (TLM) method, are employed to investigate the HEMP coupling effect on a wire located inside a cylindrical shielding cavity having one or few apertures. The EM models of the wire and the apertured shielding cavity are constructed, and the induced wire currents through the aperture of cavity are simulated. By comparing the simulation results of the wire with and without shield of the cavity, the shielding effectiveness (SE) is calculated. Further, the effects on induced wire in various cases are compared and analyzed, including single-aperture and multiple-aperture, different incident angles, polarization angles, and wire locations. Also, the cylindrical cavity is compared with the rectangular cavity.
Author(s): S. T. Song, H. Jiang, Y. L. Huang
File Type: Journal Paper
Issue:Volume: 27      Number: 6      Year: 2012
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Title: Scattering by a 2D Crack: The Meshfree Collocation Approach
Abstract: In this paper, the meshfree collocation method is applied to the problem of EM scattering by a 2D crack in a PEC plane. The hybrid PDE-IE formulation is the mathematical statement of the problem. Consequently, the geometry and the filling material of the cavity is arbitrary. Validations are based on convergence analysis, modal solution and measurement results. Furthermore, elliminating numerical integrations has lead to a fast, accurate, and general meshfree solution.
Author(s): B. Honarbakhsh, A. Tavakoli
File Type: Journal Paper
Issue:Volume: 27      Number: 3      Year: 2012
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Title: RF Antenna Design for 3D Quantum Memories
File Type: Conference Paper
Issue:Volume: S25 Microwave Quantum Information Technology - II      Number:      Year: 2021
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Title: Reducing Electromagnetic Coupling in Shielded Enclosures using a Genetic Algorithm -- Finite-Difference Time-Domain Solver
Abstract: Comprehensive shielding in modern electronic equipment may lead to resonant behaviour within the equipment enclosure. This paper presents a method for optimising the placement of sources of electromagnetic (EM) energy and susceptors to this EM energy within an enclosed resonant cavity. The source and susceptor are placed on a dielectric slab within a perfectly conducting enclosure to reduce the level of EM coupling between the two. Optimisation is facilitated using a genetic algorithm coupled with a finite-difference time-domain solver. Results are presented for single objective optimisation and multi-objective optimisation cases.
Author(s): Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan, Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan
File Type: Journal Paper
Issue:Volume: 17      Number: 3      Year: 2002
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Title: Reducing Electromagnetic Coupling in Shielded Enclosures using a Genetic Algorithm -- Finite-Difference Time-Domain Solver
Abstract: Comprehensive shielding in modern electronic equipment may lead to resonant behaviour within the equipment enclosure. This paper presents a method for optimising the placement of sources of electromagnetic (EM) energy and susceptors to this EM energy within an enclosed resonant cavity. The source and susceptor are placed on a dielectric slab within a perfectly conducting enclosure to reduce the level of EM coupling between the two. Optimisation is facilitated using a genetic algorithm coupled with a finite-difference time-domain solver. Results are presented for single objective optimisation and multi-objective optimisation cases.
Author(s): Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan, Russell Iain Macpherson, N J Ryan, R. I. Macpherson, N. J. Ryan
File Type: Journal Paper
Issue:Volume: 18      Number: 3      Year: 2003
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Title: Reduced Order Modeling in TLM
File Type: Conference Paper
Issue:Volume: Hybrid and Coupled Time Domain Solution Methods      Number:      Year: 2003
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Title: Radiated Fields of Patch Antennas – A Comparison of Simulated and Analytic Results
File Type: Conference Paper
Issue:Volume: S35 EM Modeling Using FEKO II      Number:      Year: 2019
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Title: RADAR CROSS SECTION OF A RECTANGULAR CAVITY- A MASSIVELY PARALLEL CALCULATION
Abstract: A sequential code that calculates the radar cross section of a rectangular waveguide cavity was modified to execute on a MasPar MP-l massively parallel computer with a SIMD architecture. The code uses the mode matching method of analysis to produce a set of matrix equations. Steps taken to accomplish the parallelization are discussed and some specific examples of program modification are presented. Timing results for wideband data are given that demonstrate the power of parallel computers for this type of application. Suggestions are made for further improvements as increased memory space becomes available. [Vol. 10, No. 2 (1995), pp 30-45]
Author(s): L. D. Vann, L.T. Willet, J.S. Bagby, H.F. Helmken, L. D. Vann, L.T. Willet, J.S. Bagby, H.F. Helmken
File Type: Journal Paper
Issue:Volume: 10      Number: 2      Year: 1995
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Title: RADAR ANTENNA PATTERN ANALYSIS FOR THE SPACE SHUTTLE USING NEC-BSC
Abstract: In order to improve tracking capability, radar transponder antennas will be mounted on the space shuttle solid rocket boosters (SRB). These four antennas, each being identical cavity-backed helices operating at 5.765 GHz, will be mounted near the top of the SRB's, adjacent to the intertank portion of the external tank. The purpose of this study is to calculate the roll-plane pattern (the plane perpendicular to the SRB axes and containing the antennas) in the presence of this complex electromagnetic environment. The large electrical size of this problem mandates an optical approach, thus a general purpose code, the Numerical Electromagnetics Code - Basic Scattering Code, was chosen as the computational tool. This code is based on the modern Geometrical Theory of Diffraction and allows computation of scattering of bodies composed of canonical shapes such as plates and elliptic cilinders. Apertures mounted on a curved surface (the SRB) cannot be accommodated by the code, so an antenna model consisting of wires was devised that approximated the actual performance of the antennas. Although the method of moments (MM) was not used in developing the antenna model, the code's MM input option proved instrumental in implementing the scheme. The improvised antenna model matched well with measurements taken at the NASA/Marshall Space Flight Center (MSFC) range. The SRB's, the external tank, and the shuttle nose were modeled as circular cylinders, and the code was able to produce what is thought to be a reasonable roll-plane pattern. [Vol. 5, No. l, pp. 39-46 (1990)]
Author(s): Roger Radcllff, Warren Harper, Roger Radcllff, Warren Harper
File Type: Journal Paper
Issue:Volume: 5      Number: 1      Year: 1990
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Title: Predicting the Aperture Coupling to Complex Cavities: A Stochastic Green’s Function Approach
File Type: Conference Paper
Issue:Volume: S23 Advances in Frequency-Domain CEM Techniques and Applications      Number:      Year: 2020
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Title: Performance Comparison of Uniform EBG and Broadband Progressive EBG Inside a Back Cavity of a Spiral Antenna
File Type: Conference Paper
Issue:Volume: Advances in Antenna Design and Applications      Number:      Year: 2011
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Title: Performance Capability Modeling and Optimization of RF and Millimeter Wave Systems Using Hybrid Statistical/Electromagnetic Techniques
File Type: Conference Paper
Issue:Volume: Advanced EMC Modeling      Number:      Year: 2007
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Title: Parameter Selection for the Radial Point Interpolation Time-Domain Method
File Type: Conference Paper
Issue:Volume: Time Domain Methods in Numerical Electromagnetics      Number:      Year: 2009
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Title: Overview of Vital Sign Detection-Simulation and Measurements
File Type: Conference Paper
Issue:Volume: S25 Vital Sign Detection I      Number:      Year: 2016
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Title: Optimized Design of Substrate Integrated Waveguide Cavity based Oscillators
File Type: Conference Paper
Issue:Volume: Efficient Microwave Subsystem Design and Optimization      Number:      Year: 2010
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Title: Optical Isolation using Compact Time-modulated Cavity Array
File Type: Conference Paper
Issue:Volume: S08 Advances in Finite Difference and Other Numerical Methods for Computational Electromagnetics and Photonics      Number:      Year: 2020
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Title: Optical Isolation using Compact Time-modulated Cavity Array
Abstract: It is shown using coupled mode theory and verified using finite-difference time-domain simulations how a timemodulated three-cavity array can be designed to allow transmission from port 1 to port 2 but to prevent transmission from port 2 to port 1 thereby implementing optical isolation. The reciprocity of the system is broken by phase-shifting the modulation signal applied to each cavity by 120 degrees which gives the system a synthetic linear momentum.
Author(s): A. Mock
File Type: Journal Paper
Issue:Volume: 35      Number: 11      Year: 2020
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Title: Numerical Study on Drastic-variation Condition of Electric Field in Microwave Heating System
File Type: Conference Paper
Issue:Volume: 3-4-A Multi-Physics Modelling and Time-Domain and Frequency-Domain Computational Methods      Number:      Year: 2017
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Title: Numerical Simulation and Experimental Study of ISAR Imaging of Spherical Convergent Flap Nozzle
Abstract: The research on the electromagnetic scattering characteristics of the aero-engine nozzle can provide an important reference for the electromagnetic stealth design of aircraft. In this paper, the numerical simulation and experimental measurement are used to study the radar cross section (RCS) and inverse synthetic aperture radar (ISAR) image characteristics of spherical convergence flap nozzle (SCFN). Firstly, the feasibility of using the shooting bouncing ray (SBR) method to calculate the scattering characteristics of electrically large and deep cavity is verified. Secondly, the numerical simulation data and experimental data of electromagnetic scattering of SCFN are processed by ISAR imaging algorithm, the numerical and experimental ISAR images of SCFN are obtained. The results show that SBR can effectively calculate the RCS of the electrically large size cavity within ± 30° of the axis direction. The polarization influences the experimental ISAR image. Both the numerical and the experimental ISAR image can accurately reflect the scattering center distribution inside the SCFN, and the numerical ISAR image is superior to the experimental ISAR image in image entropy and equivalent number of looks (ENL), and is partly inferior to the experimental ISAR image in terms of image average gradient. The results prove the validity and accuracy of the numerical ISAR image.
Author(s): Y. Liang, Q. Yang, Y. Shi, J. Bai, Q. Lin
File Type: Journal Paper
Issue:Volume: 35      Number: 4      Year: 2020
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Title: Numerical Investigation of the Quarter Wave Coaxial Cavity Resonator Quality Factor through Wire Grid Modeling in NEC
File Type: Conference Paper
Issue:Volume: Advances in Computer-Aided Design of Electromagnetic Structures and Devices      Number:      Year: 2006
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Title: Numerical Characterization of Cavity-Backed Aperture- Coupled Antenna Problem using Hybrid Finite Element Method (FEM) / Method of Moment (MoM) technique
File Type: Conference Paper
Issue:Volume: Recent Antenna Applications      Number:      Year: 2003
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Title: NUMERICAL ANALYSIS OF THE "FERRIS WHEEL" MICE EXPOSURE SYSTEM USING AN EFFICIENT CYLINDRICAL FDTD SCHEME
Abstract: The objective of this study is to develop a numerical tool for characterizing the "ferris wheel" exposure system employed in a long-term study of RF exposure on mice [5]. The "ferris wheel" is a radial cavity loaded with forty mice around its perimeter. In order to exploit the angular periodicity of the radial exposure system, we developed a Finite Difference in Time Domain (FDTD) code based on a cylindrical grid to analyze a single angular sector of the 40-mouse "ferris wheel". The singularity of the Maxwell equations in the cylindrical FDTD scheme was appropriately removed, and other suitable expedients were implemented to reduce simulation time and memory requiremnts. In order to estimate RF leakage, the actual openings in the radial cavity, needed to insert the mice, were considered as well. The FDTD scheme incorporates the perfectly matched layer (PML) unsplit formulation (anisotropic medium), as absorbing boundary condition. The code was validated with measurements, showing good agreement. A criterion for assessing the uniformity of the exposure is presented, together with results at 900 MHz and 1.8 GHz.
Author(s): P. Russo, A. Faraone, P. Russo, A. Faraone
File Type: Journal Paper
Issue:Volume: 16      Number: 2      Year: 2001
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Title: Novel Design of Cavity-Backed Slot Antenna by Reformed Ground Plane (Corner Notch and Stepped) and Elongated Mushroom (EM)-EBG
Abstract: A common problem for the performance of a Cavity-Backed Slot (CBS) antenna could be the heavily effect of ground plane. Travelling surface currents on ground plane could cause destructive effect on the characteristics of CBS antenna. This mainly appears on gain back lobe and also Front to Back Ratio (FBR) of pattern. To resolve this problem, the stepped ground plane and the Extended Mushroom Electromagnetic Band-Gap (EM-EBG) structure was introduced, which could minimize ground plane effects by changing the current distribution. Good agreement was achieved between the simulated and measured results. Experimental results showed that on a frequency range over 14-16 GHz, the gain was better than 11 dB and FBR of pattern in the H-plane reached to 26 dB.
Author(s): S. Manshari, M.-N. Azarmanesh
File Type: Journal Paper
Issue:Volume: 29      Number: 8      Year: 2014
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Title: Novel Compact Substrate Integrated Waveguide Balun Filter and Balanced Filter
File Type: Conference Paper
Issue:Volume: 3-MA-2 Novel Multi-functional Integrated Microwave Circuits and Components      Number:      Year: 2018
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Title: New Heating Characteristics of a Radio Frequency Rectangular Resonant Cavity Applicator Using Various Antennas for Hyperthermic Treatment
Abstract: The heating characteristics of a radio frequency rectangular resonant cavity applicator excited by various antennas are investigated for use in hyperthermic treatment. The coupled electromagnetic and heat-transfer equations are solved to obtain the heating characteristics. Two types of antennas and three types of dielectric phantoms are used in the calculations and measurements. Clear differences in the heating characteristics are observed for these phantoms and antennas. Previously, we were only able to heat up the surface or end regions of the phantom, while it is now possible to uniformly heat up the deeper regions with the current applicator. Therefore, this applicator is suitable for hyperthermic treatment.
Author(s): Y. Tange, Y. Kanai , Y. Saitoh, T. Kashiwa, Y. Tange, Y. Kanai , Y. Saitoh, T. Kashiwa
File Type: Journal Paper
Issue:Volume: 22      Number: 2      Year: 2007
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Title: New Heating Characteristics of a Radio Frequency Rectangular Resonant Cavity Applicator using an L-Type Antenna for Hyperthermic Treatment
File Type: Conference Paper
Issue:Volume: Low Frequency Applications - 1      Number:      Year: 2006
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Title: New Compact and Broadband Patch Antenna Configurations for Wireless Applications
Abstract: We present new compact patch antenna configurations with broadband capabilities for wireless applications. Analytical, simulation, and experimental work is performed on semi-circular and quarter-circular patch antennas with a shorting pin. The resonant frequencies and radiation fields of the dominant cavity modes of the shorted patch are derived. For the shorted semi-circular patch, the broadband operation is based on the efficient excitation of two staggered modes of the patch. It is shown that a relative bandwidth of 58% is achieved with a patch area that is only 13.6% of the central wavelength squared. The shorted quarter circular patch with the same radius as the half circular one provides a relative bandwidth of about 30%.
Author(s): A. F. Almutairi, N. A. Aljuhaishi, S. F. Mahmoud
File Type: Journal Paper
Issue:Volume: 24      Number: 5      Year: 2009
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Title: Near-field BER and EVM Measurement at 5.8 GHz in Mode-stirred Metal Enclosure
Abstract: This work presents over-the-air (OTA) performance, near-field bit-error-ratio (BER), and error vector magnitude (EVM) measurement using software-defined radio (SDR) in the mode-stirred metal enclosure at 5.8 GHz. The metal enclosure is stirred at 5.8 GHz using metallic paddle rotating with uniform speed. Paddle rotation creates a uniform electromagnetic field in the metal enclosure. The electromagnetic field environment in the metal enclosure can be controlled by loading the cavity with absorbing material. Field absorption can be different depending on the amount of absorbing material and location of the absorbers in the metal enclosure. It is shown that signal attenuation increases as we increase the number of absorbers. BER and EVM are measured in this environment and the performance of SDR based digital receiver is analyzed in this environment at RF frequency of 5.8 GHz.
Author(s): M. Lodro, C. Smart, G. Gradoni, A. Vukovic, D. Thomas, S. Greedy
File Type: Journal Paper
Issue:Volume: 35      Number: 9      Year: 2020
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Title: Narrow Band, Sharp Roll-Off Rejection Frequency Selective Surface Based on Substrate Integrated Waveguide
Abstract: In this paper, a novel frequency selective surface which has a narrower passband and sharper rolloff rejection than the other single layer designs, is presented. Also, it has better independency from angle and polarization of incident plane wave. In this design a ring loop is placed on a cylindrical cavity of substrate integrated waveguide (SIW). Because of the most compatibility between loop and the electric fields of cylindrical cavity, minimum insertion loss and narrow passband are achieved.
Author(s): M. S. Samani, R. S. Shirazi, G. Moradi
File Type: Journal Paper
Issue:Volume: 30      Number: 7      Year: 2015
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Title: Mutual Coupling of Internal Transmit/Receive Pair in Launch Vehicle Fairing Model using WIPL-D
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using Wipl-D      Number:      Year: 2011
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Title: Multi-channel Combiner Design Using WIPL-D
File Type: Conference Paper
Issue:Volume: EM Applications Using WIPL-D      Number:      Year: 2013
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Title: Modulation of the Antenna-Head Interaction inside a Closed Environment Using MOM-GEC Method
Abstract: The interaction between human head and GSM antenna evaluations are usually conducted in freespace situations but wireless communication devices are frequently used in enclosed environments, such as vehicle, that consist of metallic boundaries. In such fully enclosed or semi-enclosed spaces, human exposure in terms of SAR is closely related to the EM field, which is multiplied, reflected and scattered by the metallic walls of the enclosure. This could lead to complicated resonance effects and affections in the antenna performances. This possible argument of an EM field inside an enclosure has raised serious concerns among the general public. This paper will therefore focus on the impact of dipole antenna modeling the handsets on the SAR distribution inside a cavity modeling the vehicle. Theoretical formulation and simulations are used to study this phenomenon but there is a lot of limitations. Despite, modulation using numerical method are used. A MoMGEC modeling approach is applied to study the behavior of a dipole antenna resonating at 1.8 GHz. First of all, we are interested in studying the convergence of the input impedance. The current and the electric field distribution are simulated. The specific absorption rate (SAR) is examined for several different tissues.
Author(s): H. Messaoudi, T. Aguili
File Type: Journal Paper
Issue:Volume: 33      Number: 4      Year: 2018
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Title: Modelization of Plasma Breakdown by Using Finite Volume Time Domain Method
File Type: Conference Paper
Issue:Volume: Unstructured Mesh Time Domain Techniques      Number:      Year: 2011
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Title: Modeling of Photonic Waveguide for Biosensing
File Type: Conference Paper
Issue:Volume: Low Frequency Applications - 2      Number:      Year: 2006
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Title: Modeling and Realization of Cavity-Backed Dual Band SIW Antenna
Abstract: Herein, substrate integrated waveguide technology is applied in order to design high performance dual-band microstrip patch antennas. Two microstrip patch antenna designs were studied and modeled in 3D electromagnetic simulators. The obtained optimal models were then realized and measured. The measurement performance of the proposed antenna designs were then measured for 2.4 and 5.6 GHz. The results suggest that the proposed model consisting of a modified microstrip cavity-backed antenna and a defected ground structure is a high performance and low cost solution for 2.4 and 5.6 GHz applications.
Author(s): M. A. Belen, P. Mahouti, A. Caliskan, A. Belen
File Type: Journal Paper
Issue:Volume: 32      Number: 11      Year: 2017
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Title: Modeling and Experiments of High-Quality Factor Cavity Shielding Effectiveness
File Type: Conference Paper
Issue:Volume: S11 Computational Electromagnetics, Advanced Algorithms and Emerging Applications      Number:      Year: 2019
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Title: Model to Test Electric Field Comparisons in a Composite Fairing Cavity
File Type: Conference Paper
Issue:Volume: EMC in Complex Systems and Reverberant Environments      Number:      Year: 2013
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Title: Mode Matching in Microstrip Antenna with both Electric and Magnetic Surface Current on Sidewall in Cavity Model
Abstract: A model is developed to calculate the input impedance of a coaxially fed circular microstrip disc antenna in L band and C band. A mode matching approach with both electric and magnetic surface current is used, which makes it possible to improve the effects of modes. In addition, the method of images is used to remove the ground plane. Finally comparison is made with CST studio results, as it can be seen the theoretical calculations for input impedance are in good agreement with CST studio results except for minor shift in frequency.
Author(s): F. R. Rostami, G. Moradi, R. S. Shirazi
File Type: Journal Paper
Issue:Volume: 31      Number: 7      Year: 2016
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Title: Miniature Printed Magnetic Photonic Crystal Antennas Embedded into Vehicular Platforms
Abstract: In this paper, a miniature printed antenna utilizing magnetic photonic crystal (MPC) modes is presented. Typically, MPC modes are supported by a combination of anisotropic dielectric and ferrimagnetic layers. Here, these modes are emulated using coupled printed lines on a grounded dielectric substrate with small, biased ferrimagnetic inclusions. The resonant antenna is formed by cascading two unit cells excited with a probe feed. A recessed, cavity-backed version of this antenna is embedded into a vehicular platform with a goal to minimize platform effects. Several locations on the vehicle are studied and antenna placement is optimized using a combination of two commercially available electromagnetic simulators.
Author(s): E. Irci, K. Sertel, J. L. Volakis
File Type: Journal Paper
Issue:Volume: 26      Number: 2      Year: 2011
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Title: Miniature Printed Magnetic Photonic Crystal Antennas Embedded into Vehicular Platforms
File Type: Conference Paper
Issue:Volume: Antenna Modeling, Simulation, and Validation      Number:      Year: 2010
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Title: Method of Moments Analysis of Electromagnetic Transmission Through an Arbitrarily Shaped 3D Cavity in a Thick Conducting Plane
Abstract: The method of moments (MOM) with surface equivalence principle is used to numerically solve the problem of electromagnetic scattering from and transmission through an arbitrarily shaped 3D cavity in a thick conducting plane is considered. The conducting walls of the cavity inside the ground plane are of arbitrary shape. The apertures at both ends of the cavity are also of arbitrary shape. An equivalent surface magnetic current placed on the top aperture produces the scattered field in the region where the impressed sources are. The total field inside the cavity is produced by two surface equivalent magnetic currents on the apertures and an equivalent surface electric current residing on the walls of the cavity as well as on both apertures. The transmitted field on the opposite side of the impressed sources is computed by an equivalent surface magnetic current residing on the bottom aperture. Computed results are compared with results in the literature obtained by using other methods. Very good agreement is observed.
Author(s): A. B. Olcen, S. T. Imeci, M. Gokten, J. R. Mautz, E. Arvas
File Type: Journal Paper
Issue:Volume: 30      Number: 11      Year: 2015
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Title: Measurement of Complex Permittivity of Polystyrene Composite at 11.64 GHz Using Cavity Perturbation Technique
Abstract: Complex permittivity of polystyrene composites of different percentage of carbon black fillers are measured over the wide frequency range 8-12 GHz using X-band rectangular cavity resonator. The measurement technique uses the cavity perturbation technique. Validity of present measurement technique has been checked by measuring the dielectric properties of wellknown dielectric materials (Teflon and Rexolite). Polystyrene composites are very useful for lightweight shielding and absorbing materials. It would be of great interest for the community to find its dielectric properties over wider frequency range. Due to lack of experimental data on dielectric parameters of carbon black composite in literature, the experimental study has been conducted to measure the dielectric properties of polystyrene composite over wide frequency range of X-band (8-12 GHz). In addition, the estimation of measurement error associated with this technique is also discussed.
Author(s): S. Sharma, D. Kaur
File Type: Journal Paper
Issue:Volume: 31      Number: 1      Year: 2016
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Title: Mathematical Model for Calibration of Potential Detection of Nonlinear Responses in Biological Media Exposed to RF Energy
Abstract: An efficient way to test for potential unsymmetrical nonlinear responses in biological tissue samples exposed to a microwave signal is to observe the second harmonic in a cavity resonant at the two frequencies, with collocated antinodes. Such a response would be of interest as being a mechanism that could enable demodulation of information-carrying waveforms. In this work, an electric circuit model is proposed to facilitate calibration of any putative nonlinear RF energy conversion inside a high quality-factor resonant cavity with a known nonlinear loading device. The first and second harmonic responses of the cavity due to loading with the nonlinear and lossy material are also demonstrated. The results from the proposed mathematical model give a good indication of the input power required to detect any very weak second harmonic signal in relation to the sensitivity of the measurement equipment. Hence, this proposed mathematical model will assist in determining the level of the second harmonic signal in the detector as a function of the specific input power applied.
Author(s): C. H. See, R. A. Abd-Alhameed, A. F. Mirza, N. J. McEwan, P. S. Excell, Q. Balzano
File Type: Journal Paper
Issue:Volume: 32      Number: 1      Year: 2017
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Title: Low Side-Lobe Substrate Integrated Cavity Antenna Array Using Unequal Microstrip-Ridge Gap Waveguide Feeding Network at 94 GHz
File Type: Conference Paper
Issue:Volume: 4-P4-D Millimeter-Wave GAP Waveguide Technology      Number:      Year: 2017
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Title: L-band Dual Fed EM Coupled Circularly Polarized Circular Stacked Patch Phased Array Design using Antenna Magus and CST MICROWAVE STUDIO
File Type: Conference Paper
Issue:Volume: Applications of Electromagnetic Simulation for Designing and Analysis of Antennas and Radio Propagations      Number:      Year: 2013
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Title: Koopman Autoencoder Architecture for Current Density Modeling in Kinetic Plasma Simulations
File Type: Conference Paper
Issue:Volume: S18 Time-Domain Techniques for Designing Electromagnetic and Optical Devices - I      Number:      Year: 2021
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Title: Ka-Band Wilkinson Power Divider with Integrated Thin Film Resistor
File Type: Conference Paper
Issue:Volume: Graduate and Undergraduate Student Projects in Microwaves and Antennas      Number:      Year: 2008
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Title: Investigations of All Metal Heat Sink Dual Linear Polarized Phased Array Antenna for Ku-Band Applications
File Type: Conference Paper
Issue:Volume: S15 Antenna Arrays and Applications      Number:      Year: 2020
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Title: Influence of the Simulation Parameters on the Normalized Impedance Derived by the Random Coupling Model Simulation
Abstract: The random coupling model (RCM, introduced by the “chaos group” in the University of Maryland, is found of great use in making statistical predictions of the induced voltages and currents on objects or components within complicated (wavechaotic) cavities when excited by external high power microwave (HPM) radiation. A key point to applying the RCM to a real system is to generate the normalized cavity impedance, which can be described by the random matrix theory (RMT), from the cavity loss parameter by using random matrix Monte Carlo simulation. The influences of the simulation parameters on the statistics of the generated normalized impedance are presented and discussed in this paper. It’s found that the statistics of the normalized impedance only depends on the loss parameter, ?, which agrees with the theory. When ? increases, the variances of the eigenvalues, the diagonal elements and the off-diagonal elements of the normalized impedance are exponentially damped with different damping factor, which are experimentally verified in the paper.
Author(s): X. Li, C. Meng, Y. Liu, E. Schamiloglu
File Type: Journal Paper
Issue:Volume: 30      Number: 9      Year: 2015
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Title: Hybrid Nonlinear and Electromagnetic Design of an Active Oscillator SIW Cavity Backed Slot Antenna
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2010
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Title: Hybrid Nonlinear and Electromagnetic Design of an Active Oscillator SIW Cavity Backed Slot Antenna
File Type: Conference Paper
Issue:Volume: Efficient Microwave Subsystem Design and Optimization      Number:      Year: 2010
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Title: Hybrid Electromagnetic and Non-Linear Modeling and Design of SIW Cavity-Backed Active Antennas
Abstract: This paper presents the modeling and implementation of planar passive and active cavity-backed antennas in substrate integrated waveguide (SIW) technology. The cavity-backed topology helps suppressing the undesired surfacewave modes and may provide better phase noise performance in the antenna oscillator. The use of SIW technology allows for a compact and costeffective implementation of the structure. The design of the active antenna involves both electromagnetic full-wave modeling for the radiating structure and nonlinear analysis of the active circuitry through harmonic balance and transient simulations. Single substrate prototypes of both passive and active antennas operating in X band are presented and measured, showing good agreement with simulated results.
Author(s): F. Giuppi, A. Georgiadis, M. Bozzi, S. Via, A. Collado, L. Perregrini
File Type: Journal Paper
Issue:Volume: 25      Number: 8      Year: 2010
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Title: HMSIW Cavity Filters Employing Various Complementary Split-Ring Resonators for Microwave Remote Sensing Applications
Abstract: In this work, bandpass filters employing half-mode substrate integrated waveguide (HMSIW) cavities and various modified complementary split-ring resonators (CSRRs) are presented. The two modified CSRRs, which are called as Type-I and Type-II CSRRs, can exhibit larger effective inductance and capacitance, and eventually to contribute to the size miniaturization of the resonators. Thereafter, as the two CSRRs are independently loaded into HMSIW cavities, the newlyformed HMSIW-CSRR cavity resonators can achieve more size reduction as compared with the HMSIW cavity with the conventional CSRR. To demonstrate the proposed concept, two HMSIW cavity bandpass filters independently loaded with the proposed Type-I and Type-II CSRRs are implemented. Experimental results shows that measurements of the proposed filters agree with their corresponding simulations well. Meanwhile, as compared with some similar works, the two proposed filters achieve size reduction of 76.8% and 78.6%, respectively, as well as good selectivity, illustrating their suitability for the system integration application in microwave remote sensing and radar systems.
Author(s): L. Wang, Z. He, Y. M. Huang, S. Ding, M. Bozzi
File Type: Journal Paper
Issue:Volume: 34      Number: 9      Year: 2019
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Title: High Performance VHF Diplexer Design Using WIPL-D
File Type: Conference Paper
Issue:Volume: EM Applications using WIPL-D      Number:      Year: 2012
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Title: Heating properties of an RF Rectangular Resonant Cavity Applicator for Hyperthermia with Multiple Antennas
File Type: Conference Paper
Issue:Volume: CEM Applications      Number:      Year: 2010
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Title: Heating Characteristics of a Newly Developed RF Cavity Resonator for Hyperthermia that Targets Deep-Seated Tumor
File Type: Conference Paper
Issue:Volume: S19 Finite Difference Methods and Other Techniques I      Number:      Year: 2019
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Title: Finite Element Analysis of a QWCCR with Dielectric Slugs
File Type: Conference Paper
Issue:Volume: Dielectric Resonator Antennas      Number:      Year: 2011
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Title: FDTD Modelling of Optical Polarisation Rotation in a Charged Quantum Dot - Micropillar System
File Type: Conference Paper
Issue:Volume: S13 Advanced Time Domain Solvers for Multiphysics Modeling in Photonics      Number:      Year: 2019
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Title: Fast and Accurate FEM based Model for the Periodic Layered Structure of Vertical Cavity Surface Emitting Lasers
File Type: Conference Paper
Issue:Volume: S21 Photonics Modeling and Applications      Number:      Year: 2021
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Title: Extending the Uniformly Stable Conformal Technique to Model Curved PEC Objects in 3-Dimensional High-Order FDTD
File Type: Conference Paper
Issue:Volume: Finite Difference Methods      Number:      Year: 2013
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Title: Extended Radar Return from a Rocket Engine: A Thermal Model
File Type: Conference Paper
Issue:Volume: Topics in Radar Scattering      Number:      Year: 2011
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Title: Electromagnetic-thermal Field Simulation of a Novel Cavity Device with Accelerated FDTD method
File Type: Conference Paper
Issue:Volume: Advanced Electromagnetic Modeling Methods Part I      Number:      Year: 2014
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Title: Electromagnetic-Thermal Analysis of an RF Rectangular Resonant Cavity Applicator for Hyperthermia Targeting Deep-Seated Tumor and Using Thermal Modulation
File Type: Conference Paper
Issue:Volume: Advances in FDTD Method and Applications      Number:      Year: 2011
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Title: Electromagnetic Scattering by Multiple Cavities Embedded in the Infinite 2D Ground Plane
Abstract: This paper is concerned with the mathematical analysis and numerical computation of the electromagnetic wave scattering by multiple open cavities, which are embedded in an infinite two-dimensional ground plane. By introducing a new transparent boundary condition on the cavity apertures, the scattering problem is reduced to a boundary value problem on the two-dimensional Helmholtz equation imposed in the separated interior domains of the cavities. The existence and uniqueness of the weak solution for the model problem is studied by using a variational approach. A block Gauss-Seidel iterative method is introduced to solve the coupled system. Numerical examples are presented to show the efficiency and accuracy of the proposed method.
Author(s): P. Li, A. W. Wood
File Type: Journal Paper
Issue:Volume: 29      Number: 7      Year: 2014
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Title: Electromagnetic Scattering by a Protruding Cavity Embedded in an Impedance Plane
File Type: Conference Paper
Issue:Volume: Poster Session      Number:      Year: 2008
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Title: Electromagnetic Modeling of an Adaptable Multimode Microwave Applicator for Polymer Processing
Abstract: This paper presents the electromagnetic modeling of a novel adaptable multi-feed multimode cylindrical cavity applicator where the spatial distribution of the electric field can be specified a priori to accomplish a desired processing task. The electric field intensity inside the cavity can be tailored by just varying the power delivered to each port, and the mode-switching can be realized without mechanically adjusting the cavity dimensions. An orthogonal feeding mechanism is developed to reduce the cross coupling between the ports. Numerical simulations are performed for the cavity applicator to verify the theoretical analysis.
Author(s): R. Sun, L. C. Kempel, L. Zong, S. Zhou, M. C. Hawley, R. Sun, L. C. Kempel, L. Zong, S. Zhou, M. C. Hawley
File Type: Journal Paper
Issue:Volume: 20      Number: 1      Year: 2005
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Title: Electromagnetic Modeling of an Adaptable Multimode Microwave Applicator for Polymer Processing
File Type: Conference Paper
Issue:Volume: Advances in CEM      Number:      Year: 2004
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Title: Electromagnetic Coupling Analysis of Transient Excitations of Rectangular Cavity through Slot using TD-EFIE with Laguerre Polynomials as Temporal Basis Functions
Abstract: This paper presents an electromagnetic coupling analysis of transient waves excited a rectangular cavity containing an interior scatterer coupled to an external scatterer through a slot. Based on the equivalence principle, time domain integral equations are established by enforcing the boundary conditions on the internal and external scatterers, the slot and the cavity walls. The method of moments is applied in space and time domains to solve the developed system of integral equations. The unknown coefficients of the electric and magnetic currents are approximated by the triangular piecewise functions associated with Dirac function as space basis. To obtain accurate and stable solutions, the Laguerre functions are used as temporal basis. Numerical results involving the coupling effects between the cavity components are investigated. The numerical results are found to be in good agreement with EM theory and literature.
Author(s): D. Omri, T. Aguili
File Type: Journal Paper
Issue:Volume: 31      Number: 10      Year: 2016
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Title: Electrodynamics of Dipolar Beads in an Electrophoretic Spherical Cavity
Abstract: The transient dynamics of dipolar beads in an electrophoretic spherical cavity presents an interesting phenomenon, because it captures the interplay of electrophoretics, particle dynamics, and tribology. The problem geometry is described by a dipolar bead immersed in a polarized fluid within the cavity. Switching bias voltages are applied to induce both translational and rotational motion of the bead. This paper details a model of coupled phenomena which employs ODE’s to describe the bead dynamics, integral equations for the field solution, and particle simulation for the bipolar migrations. Special focus is given to the impact of confinement and gravitational force on the bead dynamics.
Author(s): M. H. Lean, A. R. Völkel
File Type: Journal Paper
Issue:Volume: 24      Number: 6      Year: 2009
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Title: Electrodynamics of Dipolar Beads in an Electrophoretic Spherical Cavity
File Type: Conference Paper
Issue:Volume: Low Frequency Electromagnetic Applications      Number:      Year: 2005
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Title: Electric Field Enhancement with a Porous Spherical Cavity Resonator Excited by an External Plane Wave
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using Wipl-D      Number:      Year: 2011
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Title: Efficient Electromagnetic Scattering Analysis of Open-ended Circular Cavities with Modal MoM Method
Abstract: An efficient and accurate technique is introduced to calculate the scattered electromagnetic (EM) fields from an open-ended circular cavity (OECC). In this paper, it is assumed that the OECC is perforated in an infinite perfect electric conductor (IPEC). Then, the scattered fields are calculated using modal Method of Moments. The complexity and computational cost of the encountered quadruple integrals are addressed in detail. Here, the singularities are extracted and resolved. Next, the scattered far field of a circular PEC plate of the same size is calculated by physical optics approximation. The final OECC scattered field is the sum of these two solutions. A very good agreement is observed between the results of this method and full wave numerical simulations and measurements. The proposed approach is highly efficient and accurate over a wide range of frequencies and incidence angles, making it appealing for analysis of large frequency dispersive structures.
Author(s): A. Aghabarati, P. Dehkhoda, A. Tavakoli
File Type: Journal Paper
Issue:Volume: 31      Number: 11      Year: 2016
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Title: Efficient Analysis of High Frequency EMC Problems in Complex Cavities
File Type: Conference Paper
Issue:Volume: High Frequency Techniques      Number:      Year: 2012
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Title: Efficient Analysis of Backscattering from Very Large Cavity Structures
File Type: Conference Paper
Issue:Volume: Advances in CEM Applications II      Number:      Year: 2012
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Title: Effect of Curvature on the Performance of a Cylindrically-Conformal Cavity-Backed E-patch Antenna
Abstract: The behavior of a cavity-backed Epatch antenna placed conformal to a cylindrical conducting surface is explored through simulations and experiment to determine the effects of curvature on antenna performance. It is shown that introducing a cavity backing reduces the bandwidth of an E-patch, but that the curvature of a conformal antenna partly compensates for the loss of performance. It is further shown that the curvature of a conformal antenna strongly affects both the co- and cross-polarization gain patterns.
Author(s): C. M. Gardner, L. C. Kempel, J. A. Hejase, R. O. Ouedraogo, S. W. Schneider
File Type: Journal Paper
Issue:Volume: 26      Number: 11      Year: 2011
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Title: Dynamic Mode Decomposition for Prediction of Kinetic Plasma Behavior
File Type: Conference Paper
Issue:Volume: S11 Modeling and Applications – II      Number:      Year: 2020
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Title: Dual-Band Wide-Angle Circularly-Polarized Microstrip Antenna by Ferrite Ring Inserted in Its Cavity Domain
Abstract: In this paper coaxially-fed circular microstrip patch antenna with ferrite ring in its cavity domain is presented in order to obtain dual-band circularlypolarized antenna in X-band having wide angle axial ratio in both bands. A mode matching approach is used to see the effects of each mode on input impedance of the antenna and is validated numerically by finite element method. The theoretical calculations for input impedance are in good agreement with full-wave simulation. The scattering and radiation parameters of the antenna are investigated. The antenna patch radius and height are 8 and 1 mm, respectively. The ferrite ring was made of yttrium iron garnet (YIG) and the substrate of antenna is Rogers RT5880. In the first band the antenna has 7 dB gain and the ratio of Copol/Xpol is about 24 dB and in the second band has 5 dB gain and the XPD, i.e., the ratio of Copol to Xpol is about 20 dB.
Author(s): F. R. Rostami, G. Moradi, R. S. Shirazi
File Type: Journal Paper
Issue:Volume: 32      Number: 1      Year: 2017
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Title: Drastic-Variation Condition of Electric Field and Its Applications in Microwave Heating
Abstract: Microwave heating usually leads to nonuniform temperatures due to the existence of drasticvariation of electric field. In this paper, a numerical method combined with integral equation and spectrum analysis is proposed to find its critical condition. Results show that the electric field is generally unstable, and a tiny shift in microwave frequency, permittivity of dielectric object or cavity geometrical parameters will produce a drastic variation in electric field distribution, moreover, the smallest shift of parameter can be obtained by the reverse search. FEM method is used to verify the conclusions. Finally, some supplements for the interest regarding practical applications are presented and analyzed.
Author(s): Z. Tang, S. Zhang, T. Hong, F. Chen, K. Huang
File Type: Journal Paper
Issue:Volume: 33      Number: 5      Year: 2018
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Title: Domain Decomposition Method for Scattering from an Aircraft with Jet Engine Inlet Cavity
Abstract: Monostatic radar cross section (RCS) of an combat aircraft is analyzed using iterative Least Square Method weighted domain decomposition method (LSM weighted DDM). The model of the 200 wavelengths long aircraft is made of perfect electric conductor (PEC). Inlet cavity of the jet engine is included in the model. The inlet has realistic shape, whereas cavity is closed with a PEC on the outlet side. Corresponding model without the inlet is also analyzed—the inlet contour is smoothed, and then it is closed with a PEC. Method of moments (MoM) solution is used as a reference. It is shown that the LSM weighted DDM solution can provide very good solution in just a few iterations if problematic parts of the structure are extracted in separate subdomains.
Author(s): M. S. Tasic, B. M. Kolundzija, T. S. Milosevic
File Type: Journal Paper
Issue:Volume: 34      Number: 2      Year: 2019
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Title: Domain Decomposition Method for Scattering from an Aircraft with Jet Engine Inlet Cavity
File Type: Conference Paper
Issue:Volume: S60 Numerical Methods for Analysis, Design and Measurement of Antennas II      Number:      Year: 2018
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Title: Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas
Abstract: This paper presents a novel approach to facilitate the design of wideband, cavity-backed spiral antennas. Using this approach, first, a 2-18 GHz, two-arm cavity backed Archimedean spiral antenna has been designed in FEKO. A multilayer dielectric absorber has been introduced in the cavity to facilitate unidirectional operation of the antenna. In order to incorporate the frequencydependent complex permittivity data of the absorbing materials inserted in the cavity, precise microwave instrumentation has been used to determine these parameters experimentally. Based on this data, a genetic algorithm optimization procedure has been applied to derive the most favorable geometry of the absorbing cavity. Our results show that a design thus optimized significantly improves key performance parameters, maximizes the co-polarized gain, and minimizes the cross-polarized gain of the antenna across its operational bandwidth. We have then extended the approach to the design of a zigzagged 2-arm Archimedean spiral antenna and also a 1.5:1 ratio elliptical spiral antenna and presented the radiation characteristics here.
Author(s): N. Rahman, A. Sharma, M. Asfar, S. Palreddy, R. Cheung
File Type: Journal Paper
Issue:Volume: 26      Number: 2      Year: 2011
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Title: Dielectric Characterization and Optimization of Wide-band, Cavity-Backed Spiral Antennas
File Type: Conference Paper
Issue:Volume: EM Simulations Using FEKO      Number:      Year: 2010
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Title: Development of Diplexers Based on Dual-Mode Substrate Integrated Waveguide Cavities
Abstract: Diplexers based on dual-mode Substrate Integrated Waveguide (SIW) cavities are proposed and implemented. The dual-mode cavities not only act as a resonator for both Rx and Tx channels, but also as the interconnect between these two channels which help to realize the isolation. The dual-mode cavities resonating at TE201 and TE103 modes in our design show several advantages than those dual-mode cavities operating at TE201 and TE301 modes. Single-mode cavities are cascaded with the dual-mode cavity to realize the two-order filters for Rx and Tx channels. Two design examples are presented with a normal printed circuit board process and verified by experiments.
Author(s): H. Chu, R. Mao, J.-X. Chen
File Type: Journal Paper
Issue:Volume: 30      Number: 2      Year: 2015
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Title: Development of a Broadband Substrate Integrated Waveguide Cavity Backed Slot Antenna Using Perturbation Technique
Abstract: A novel method for bandwidth enhancement of Substrate Integrated Waveguide (SIW) cavity-backed slot antenna is introduced for a single element and an array configuration. Using a corner cut in the SIW square cavity, resonant frequency of two degenerate TE210 and TE120 modes of a square cavity are separated and impedance bandwidth is improved. The simulated and measured results of the antennas show at least 140% and 220% wider bandwidth compared to the bandwidth of a conventional single cavity antenna for single and two element array antennas, respectively. The presented antennas provide a few advantages including low profile, light weight, easy fabrication with low cost and convenient integration with planar circuits.
Author(s): E. Baghernia, M. H. Neshati
File Type: Journal Paper
Issue:Volume: 29      Number: 11      Year: 2014
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Title: Design of Slot Antennas and Arrays Using the FDTD Technique and a Parallel Supercomputer
File Type: Conference Paper
Issue:Volume: FDTD Methods and Applications      Number:      Year: 2003
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Title: Design of Omni-Directional Cavity Backed Antenna for Aerocraft Application
File Type: Conference Paper
Issue:Volume: 1-3-B Space Antennas I      Number:      Year: 2017
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Title: Design of a Microstrip Conform GPS Patch Antenna
File Type: Conference Paper
Issue:Volume: Applications of FEKO      Number:      Year: 2004
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Title: Design of a Cavity Backed 15:1 Bandwidth Two Arm Spiral Helix Antenna
File Type: Conference Paper
Issue:Volume: S45 UWB and Multi-Band Antennas II      Number:      Year: 2016
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Title: Design and Full-Wave Analysis of Cavity-Backed Resistively Loaded Circular-End Bow-Tie Antennas for GPR Applications – Part II
Abstract: In this paper, a comprehensive analysis of a novel GPR antenna featuring almost 30 : 1 relative bandwidth (55 MHz ? >1.5 GHz), with a maximum antenna size of 40 cm is performed. Antenna transient behavior, near-field radiation, and impact of the ground are analyzed in details. It has been shown that the antenna exhibits reduced and short ringing, low spurious energy emission in the air region, as well as stable circuital and radiation properties over different types of soil. Furthermore, the analysis of buried pipe detection using two such antennas has been performed. Novelty of such investigation lies in the fact that at the lowest operational frequency both the receive antenna and buried pipe are situated in the near-field region, whilst at the highest operational frequency only the far field is playing the role. From this analysis, antenna coupling level and waveforms of the target return, which are of crucial importance for GPR system design, are determined.
Author(s): D. Caratelli, A. Yarovoy
File Type: Journal Paper
Issue:Volume: 25      Number: 10      Year: 2010
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Title: Design and Full-Wave Analysis of Cavity-Backed Resistively Loaded Circular-End Bow-Tie Antennas for GPR Applications – Part I
Abstract: In this paper, the design of cavitybacked bow-tie antennas for ground-penetrating radars is presented. Dielectric embedding and resistive loading of the radiating structure are employed to achieve at least 30 : 1 relative bandwidth (55 MHz? >1.5 GHz), with a maximum antenna size of 40 cm and stable antenna performance over different types of the ground. The design procedure is described in detail and provides useful guidelines for the considered class of radiators. Antenna parameters are optimized numerically to combine a large operational bandwidth with reasonably high antenna efficiency. To this end, a full-wave locally conformal finite-difference time domain procedure useful to model electromagnetic structures having complex geometrical and electrical characteristics in the vicinity of the ground is adopted.
Author(s): D. Caratelli, A. Yarovoy
File Type: Journal Paper
Issue:Volume: 25      Number: 10      Year: 2010
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Title: Cylindrical Dielectric Resonator Antenna Housed in a Shallow Cavity in a Hollow Circular Cylindrical Ground Plane
File Type: Conference Paper
Issue:Volume: Antenna Modeling, Simulation, and Validation      Number:      Year: 2010
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Title: CRLH Extended Equivalent Circuit (EEC) FDTD Method and its Application to an Open Metamaterial-Loaded Resonator
File Type: Conference Paper
Issue:Volume: Modeling Methods for Metamaterials      Number:      Year: 2006
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Title: Comparison between Measurements and Numerical Computation for the System Level Characterization of the Radiated Emissions of Unknown Sources inside Cavities
File Type: Conference Paper
Issue:Volume: Guided Waves in Non-Standard Media      Number:      Year: 2008
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Title: Compact Substrate Integrated Waveguide Band-pass Rat-race Couplers Based on Mixed Shape Cavity with Flexible Port Topology
Abstract: A new type of compact band-pass rat-race couplers with flexible port topology based on mixed shape substrate integrated waveguide (SIW) cavity is first proposed in this paper. Moreover, composite right/left-handed (CRLH) SIW unit loaded on the common wall between cavities is used to achieve negative coupling structure. The diameter of the vias on the common wall related CRLH-SIW unit is also used to adjust the electric coupling strength and increase the coupling bandwidth. The detailed analysis and the design method have been introduced to realize a filtering rat-race coupler based on substrate integrated fan-shaped cavity (SIFC) and rectangular cavity (SIRC). In particular, the combination of mixed shape resonators and port location in rectangular resonators can be selected according to the requirement of port angle interval. Compared with other filtering couplers, the proposed designs exhibit good filtering responses, high Q factor, better isolation, multiple port angle intervals, amplitude balance, as well as 0° and 180° phase differences.
Author(s): Z. Zhang, Y. Fan, Y. Zhang
File Type: Journal Paper
Issue:Volume: 35      Number: 4      Year: 2020
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Title: Compact Multilayer Substrate Integrated Waveguide Dual-band Filtering Rat-race Coupler Based on Fan-shaped Cavities
Abstract: A new type of multilayer dual-band filtering rat-race coupler based on fan shaped substrate integrated waveguide (SIW) cavity is first proposed in this paper. Resonant frequencies of SIW fan-shaped cavity (SIFC) have been derived to construct a resonant cell. Magnetic and electric coupling between SIFCs are realized through multiple rectangular and circular slots located on metal layer, respectively. Specifically, the multiple rectangular slots are beneficial to increase coupling bandwidth and achieve better amplitude and phase balance. Moreover, the bandwidth ratio and center frequency of two pass-bands can be flexibly controlled by adjusting the size of band-stop resonators. The detailed analysis and the design method based on coupling matrix have been introduced to realize a dual-band filtering rat-race coupler. The new type of component should be able to provide at least three functions simultaneously, including in-phase and out-ofphase power dividing, filtering, and dual-band operation. Compared with other filtering couplers, the proposed design exhibits good dual-band filtering responses, high Q factor, better isolation, amplitude balance, as well as 0° and 180° phase differences.
Author(s): Z. Zhang, Y. Fan, Y. Cheng, Y. Zhang
File Type: Journal Paper
Issue:Volume: 35      Number: 3      Year: 2020
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Title: Compact Modified Quarter Mode Substrate Integrated Waveguide Resonator and Its Application to Filters Design
Abstract: A novel compact modified quarter mode substrate integrated waveguide (QMSIW) resonator is proposed. The dominant resonant mode of the proposed resonator is TE101 mode. Using modified QMSIW resonator can reduce 97.3% in size with respect to its corresponding substrate integrated waveguide (SIW) counterpart. With the new coupling structures, the miniaturized cavity can be properly arranged in the filter design to minimize the footprint of the circuit. Two novel filters using compact modified QMSIW cavity are designed, and these proposed compact filters are fabricated to prove the predicted results in experiments, in which good agreement is obtained.
Author(s): Y.-Z. Zhu, W.-X. Xie, X. Deng, Y.-F. Zhang
File Type: Journal Paper
Issue:Volume: 32      Number: 2      Year: 2017
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Title: Compact 3-D Multilayer Substrate Integrated Circular and Elliptic Cavities (SICCs and SIECs) Dual-mode Filter with High Selectivity
Abstract: In this paper a multilayer dual-mode complementary filter is developed based on the substrate integrated circular and elliptic cavity (SICC and SIEC). The filter is constructed with a SICC and double SIECs, and each cavity supports two degenerate modes, which can be generated and controlled by the coupling aperture and the slot located between layers. With multilayer topology, the structures can exhibit vertical coupling between vertically stacked dual-mode cavities. It does not only have the good performance, but also reduces the circuit size much more. Moreover, sharp transition characteristic in both the lower side and the upper side demonstrates high selectivity of the filter. Good agreement is obtained between the simulated and measured results of the proposed structure.
Author(s): Z. G. Zhang, Y. Fan, Y. H. Zhang
File Type: Journal Paper
Issue:Volume: 28      Number: 4      Year: 2013
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Title: Cavity-Backed Dual-Sinuous Antenna Modeling
File Type: Conference Paper
Issue:Volume: S20 Advances in Electromagnetic Modeling by WIPL-D - II      Number:      Year: 2020
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Title: Cavity-Backed Dual-Sinuous Antenna Modeling
Abstract: Recently, for Radio Frequency (RF) signal identification on air vehicles, it has become critical to not only be able to detect the direction and angle of arrival of signals, but to also properly identify the polarization of such signals. For decades, cavity-backed dual-spiral antennas were heavily used for this purpose. However, that required the placement of both right-hand and left-hand elements to perform this function. Due to limited space and other issues, an alternative type of broadband antenna had to be identified. The Cavity-Backed Dual-Sinuous (CBDS) antenna makes an excellent replacement for this function. With its elements rotated 45° about its center, each element exhibits slant linear performance. Such an antenna, paired with proper connections and detection hardware, allows the detector to determine the polarization of arriving RF signals. A CBDS antenna was developed in the WIPL-D CEM code. Its RHCP and LHCP performance was studied over a broad range of frequencies. Results did prove that CBDS antennas have excellent broadband performance and polarization extraction.
Author(s): R. P. Ortega, N. M. Christensen, S. N. Tabet
File Type: Journal Paper
Issue:Volume: 35      Number: 11      Year: 2020
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Title: Cavity Filter Design and Optimization in WIPL-D
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation using Wipl-D      Number:      Year: 2011
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Title: CAD of Inductive Iris Waveguide Filter with Dielectric Filled Cavities
File Type: Conference Paper
Issue:Volume: Fast and Efficient Methods for Transmission Lines and Waveguides      Number:      Year: 2009
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Title: BROAD BAND MODELLING OF ELECTROMAGNETIC WAVE COUPLING TO SCATTERERS INSIDE A METALLIC CAVITY
Abstract: In this paper we present an approach based on the method of moments for the solution of an electromagnetic compatibility problem. We determine the results of the impact of an electromagnetic wave on metallic housings with small holes. By separating the interior and the exterior of the housing we are able to use the Green’s functions of the cavity. The number of unknowns is therefore reduced compared to solutions using the free space Green’s functions. Different sets of functions (either local or global) are used for the method of moments (MoM). Furthermore, we present a method to generate broad band data from only a few computations by using an “intelligent” interpolation procedure. Finally, we present an experimental setup and compare our computations with measurements.
Author(s): J. v. Hagen, W. Tabbara, D. Lecointe, J. v. Hagen, W. Tabbara, D. Lecointe
File Type: Journal Paper
Issue:Volume: 13      Number: 3      Year: 1998
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Title: Beam Position Monitoring Model of Microstrip Patch Antenna for Particle Accelerators
File Type: Conference Paper
Issue:Volume: S23 RF/Microwave Electromagnetics - Computational Modeling and Experiments      Number:      Year: 2015
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Title: Bandwidth Design of Ferrite-Based Circulators
File Type: Conference Paper
Issue:Volume: S09 Microwave/Millimeter Wave and Terahertz Devices and Applications II      Number:      Year: 2018
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Title: Axisymmetric Electromagnetic Resonant Cavity Solution by a Meshless Local Petrov-Galerkin Method
Abstract: This work describes a meshless approach to obtain resonant frequencies and field distributions in axisymmetric electromagnetic cavities. The meshless local Petrov-Galerkin is used with shape functions generated by moving least squares. Boundary conditions are imposed by a collocation method that does not require integrations. The proposed analysis has simple implementation and reduced computational effort. Results for TE and TM modes of cylindrical and spherical cavities are presented and compared with analytical solutions.
Author(s): R. D. Soares, R. C. Mesquita, F. J. S. Moreira
File Type: Journal Paper
Issue:Volume: 26      Number: 10      Year: 2011
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Title: AUTOMATIC AND EFFICIENT SURFACE FDTD MESH GENERATION FOR ANALYSIS OF EM SCATTERING AND RADIATION
Abstract: The finite difference time domain (FDTD) method has found very wide applications in the analysis of electromagnetic scattering and radiation. The first and most important issue of the FDTD modeling is to decompose a computation space, containing a given geometry, into FDTD unit cells. There are a few dedicated mesh generators which could discretize the space into cells for general analysis. However, among FDTD applications, a large portion of them deal with objects structured primarily with conducting and/or thin-dielectric plates, such as a conducting sphere or cube, a cavity, an airplane, etc. The mesh data necessary to input are those of node indices and material parameters on the object surface. Consequently geometry modeling is essentially to generate FDTD cells on the surfaces. For this purpose, a simple and effective algorithm capable of on- surface FDTD mesh generation is introduced based on a ray-tracing method. The algorithm presumes that the input geometry is described in polygons and lines which are often approximations of smooth surfaces and thin wires. In output, the algorithm decomposes automatically the polygons and lines into on-surface cells compatible with, and readable by, an FDTD solver. The algorithm has been coded in programs allowing effective and automatic generation of surface cells on various high- or low-end computer platforms. [Vol. 9, No. 2 (1994), pp 162-169]
Author(s): W. Sun, M.P. Purchine, J. Peng, C.A. Balanis, G.C. Barber, W. Sun, M.P. Purchine, J. Peng, C.A. Balanis, G.C. Barber
File Type: Journal Paper
Issue:Volume: 9      Number: 2      Year: 1994
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Title: Analytical Model for E-Shaped Microstrip Patch Antenna
Abstract: This paper presents a comprehensive insight of the E-shaped microstrip patch antenna through the introduction of its cavity model and circuit model. The cavity model of the E-shaped antenna postulates a central magnetic wall that subdivides the structure into two halves, each with the TM001 field configuration. On the other hand, the circuit model is formulated based on the segmentation yielded from the cavity model. It infers the dual-resonance of the antenna through its circuit equivalent aspect, while avoiding cumbersome computations. Both these models offer an in depth view on the operating principles of the E-shaped antenna and effectively relates to its desired performance. A proofof- concept design has been implemented. With the size of 147 × 112 mm2, the antenna design resonates at 2.4 GHz and 2.5 GHz. It is noted that the reflection coefficients of its circuit model yield a deviation of less than 4 dB from the actual board measurement.
Author(s): K. Huat Yeap, W. Ismail, K. Ho Yeap
File Type: Journal Paper
Issue:Volume: 32      Number: 4      Year: 2017
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Title: Analytical Calculation of Input Impedance of Rectangular Microstrip Patch Antennas on Finite Ground Planes
File Type: Conference Paper
Issue:Volume: Integrated Antennas for Portable Devices      Number:      Year: 2005
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Title: Analysis of Transient Electromagnetic Scattering from an Overfilled Cavity Embedded in an Impedance Ground Plane
Abstract: In this paper, we consider the timedomain scattering problem of a two-dimensional overfilled cavity embedded in an impedance ground plane. An artificial boundary condition is introduced on a semicircle enclosing the cavity that couples the fields from the infinite exterior domain to those fields inside. The problem is first discretized in time using the Newmark scheme, and at each time step, we derive the variational formulation for the TM polarization, and establish well-posedness. Numerical implementation of the method for both the planar and overfilled cavity models is also presented.
Author(s): R. S. Callihan, A. W. Wood
File Type: Journal Paper
Issue:Volume: 26      Number: 12      Year: 2011
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Title: Analysis of Transient Electromagnetic Scattering from an Over lled Cavity Embedded in an Impedance Ground Plane
File Type: Conference Paper
Issue:Volume: Student Paper Competition      Number:      Year: 2011
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Title: Analysis of Transient Electromagnetic Scattering from an Over lled Cavity Embedded in an Impedance Ground Plane
File Type: Conference Paper
Issue:Volume: Advances in Finite Element Method and Applications      Number:      Year: 2011
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Title: Analysis of Slotted Rectangular Microstrip Antenna Using De-segmentation and PDCM Method
File Type: Conference Paper
Issue:Volume: Poster Sessions 2      Number:      Year: 2007
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Title: Analysis of Multi-Layer Composite Cavity Using FEKO
Abstract: Modeling of a large cavity containing multiple layers inside the structure has been studied using equivalent impedance approximations along with simplified single ray tracing analysis. This modeling effort investigates the effects of radiating with a source enclosed in a large vacant composite structure relative to a short wavelength. The development of the model involves the completion of a two step process. First, the heritage geometric reduction and approximation is investigated. This particular investigation involves an approach that is an application of Poynting’s Theorem. This work was performed by Hallett and Reddell at Goddard Space Flight Center in 1998. For this comparison, the Multi-Level Fast Multipole Method (MLFMM) available in the commercial tool FEKO, is used to model a generic multi-layer payload fairing (hollow cone connected to a hollow cylinder) with a radiating source to determine the resonant cavity effects within the fairing as another approximation baseline. The intent is to provide predictions for the electric field levels if a transmitter in the fairing either deliberately or unintentionally is activated. The results show a comparison with the heritage calculation and FEKO software tool. However, FEKO shows the electric field distributions within the composite fairing cavity instead of a single average value.
Author(s): J. E. Stanley, D. H. Trout, S. K. Earles, I. N. Kostanic, P. F. Wahid
File Type: Journal Paper
Issue:Volume: 25      Number: 1      Year: 2010
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Title: Analysis of Multi-Layer Composite Cavity Using FEKO
File Type: Conference Paper
Issue:Volume: FEKO Modeling and Analysis VI      Number:      Year: 2009
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Title: Analysis of a Narrow Slot backed by a Rectangular Cavity using FEKO
File Type: Conference Paper
Issue:Volume: Special Session: Electromagnetic Modeling by FEKO      Number:      Year: 2005
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Title: Analysis and Design of Cylindrical Cavity Resonators and Filters Loaded by Dielectric and Metallic Pucks with the Electric Field Integral Equation Method (EIFE)
File Type: Conference Paper
Issue:Volume: Advances in Integral Equation Based Techniques I      Number:      Year: 2009
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Title: An Optimized Microwave Absorber Geometry Based on Wedge Absorber
Abstract: Low reflectivity of microwave absorbers is important to improve the performance of anechoic chamber measurements. The shape of the absorber as well as the material used are among the main components to provide desired low reflection performance. Pyramidal and wedge-shaped absorbers are two of the most wellknown microwave absorber types. We discuss the effect of a convex shape on reflection performance of microwave absorbers and show that convex shape structure has significantly performance by absorbing most of the electromagnetic energy of the incident wave. We used a concavity theorem based design method to obtain a function for a convex shape. Absorbing structures have been analyzed by using the periodic moment method (PMM). An optimization method is employed to find coefficients of the convex function, which provides better absorption performance than the wedge type absorber. Reflection performances of the wedge and convex absorbers for the 212 GHz frequency band are compared. Their reflection performances at 2 GHz for different angles of incidence are presented. An important implication of this study is that the alternative absorber shapes other than the wedge shape are demonstrated by using simple mathematical methods to have the optimal reflection characteristics.
Author(s): I. Catalkaya, S. Kent
File Type: Journal Paper
Issue:Volume: 32      Number: 7      Year: 2017
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Title: An FDTD TF-SF Boundary on Face-Centered Cubic Grids
Abstract: The implementation of total-field/scatteredfield (TF-SF) boundary for finite-difference timedomain (FDTD) method was proposed based on facecentered cubic (FCC) grids. On the basis of the arrangement of fields components in the FCC voxel, the update equations for the electric and magnetic field components of the TF-SF boundary are derived. The resonant frequency of a cavity is calculated to illustrate that the FCC grid scheme is more accurate as compared to the equivalent Yee grid method. Then, by simulating the amplitude distribution of the vertical and oblique incident plane waves in the whole calculation region, the effectiveness of the TF-SF boundary is verified numerically.
Author(s): L. Shi, L. Yang, W. Feng
File Type: Journal Paper
Issue:Volume: 35      Number: 4      Year: 2020
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Title: An Examination of the Accuracy of Integral Equation Based Modeling of the Fields within a Reverberation Chamber
File Type: Conference Paper
Issue:Volume: EMC in Complex Systems and Reverberant Environments      Number:      Year: 2013
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Title: An Estimation Method for the SLF/ELF Field Strength with L-type Horizontal Line-Current Antennas over Inhomogeneous Anisotropic Ground
Abstract: In this study, the radiation characteristics of the control source of extremely low frequency (CSELF) horizontal line-current antennas are studied by the reciprocity theorem. The radiation field strength expressions of the CSELF L-type horizontal line-current antenna are derived on the basis of a field-direction coefficient in the spherical earth-ionosphere cavity. The estimation results of the super low frequency/extremely low frequency (SLF/ELF) wave are provided with regard to the conductivity, the propagation distances and the water-depth. The propagation characteristics of the CSELF wave are calculated under different conditions and are compared to Bannister’s method. The effectiveness of the proposed method is validated by a case study.
Author(s): B. Li, C. Liu, H.-N. Wu, B. Zhang
File Type: Journal Paper
Issue:Volume: 34      Number: 8      Year: 2019
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Title: An Efficient High Order Multilevel Fast Multipole Algorithm for Cavity Scattering Analysis
File Type: Conference Paper
Issue:Volume: Higher Order Numerical Methods      Number:      Year: 2012
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Title: An Accuracy Comparison of Various Surface Integral Equations for Cavity Modeling
File Type: Conference Paper
Issue:Volume: Fast Integral Equation Methods and Stable Discretization      Number:      Year: 2013
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Title: Aircraft Resonant Cavity and Cabin Interference Coupling to a Remote Sensing, Wing-Mounted Antenna Array
File Type: Conference Paper
Issue:Volume: Electromagnetic Simulation of Electrically Large Problems      Number:      Year: 2011
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Title: Active Huygens’ Box: Arbitrary Synthesis of EM Waves in Metallic Cavities
File Type: Conference Paper
Issue:Volume: S45 Recent Advancements in the Modeling, Design and Application of Metasurfaces II      Number:      Year: 2019
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Title: Accurate Calculation of Capacitance for Three-dimensional Axisymmetric Conductors with Arbitrary Profile
File Type: Conference Paper
Issue:Volume: S10 Analytical Regularization Method (ARM)      Number:      Year: 2021
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Title: A Wideband Composite Cavity-Backed Modified Foursquare Antenna With Enhanced Patterns
File Type: Conference Paper
Issue:Volume: 5-P-1 Poster      Number:      Year: 2018
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Title: A Wideband Circularly Polarized GNSS Antenna for Satellite Platforms
File Type: Conference Paper
Issue:Volume: S46 Physically Reconfigurable Antennas and Arrays: Design, Modeling and Materials II      Number:      Year: 2019
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Title: A W-Band Dual-Polarization Slot Array Antenna with Low Sidelobe Level
Abstract: A 94-GHz dual-polarization low-sidelobelevel slot array antenna is proposed. A 2x2-slot cavitybacked subarray is adopted as the basic unit of the array. A high-isolation orthogonal-mode transducer (OMT) with a simple structure is used to excite the dualpolarization subarray. The realization of a low sidelobe level depends on the amplitude-weighted waveguide feed network. A novel unequal power dividing ratio but equal phase (UPEP) single-ridged waveguide divider is presented for the construction of the vertical polarization (VP) array feed network. A 16x16-slot low-sidelobelevel dual-polarization array antenna is fabricated. The machining difficulties of the W-band array are reduced by using simpler structures. The measured results show that the impedance bandwidth is greater than 7.3 GHz, while the first sidelobe levels are lower than -20.1 dB for both polarization arrays within the operating bandwidth. The measured gain is higher than 30.9 dBi for the two polarization arrays with an antenna efficiency better than 64%.
Author(s): H. Luo, Y. Xiao, W. Tan, L. Gan, H. Sun
File Type: Journa