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Title: ACES Journal December 2017 Cover
Abstract: ACES
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File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: ACES Journal December 2017 Front/Back Matter
Abstract: ACES
Author(s):
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: ACES Journal December 2017 Full
Abstract: ACES
Author(s):
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: Design of a Planar, Concentric Coil for the Generation of a Homogeneous Vertical Magnetic Field Distribution
Abstract: This paper describes an algorithm to design a planar, concentric coil that generates a homogeneous vertical magnetic field distribution, with a target self inductance. The algorithm consists of several steps. The first step is the random generation of a large set of concentric coils, taken into consideration a number of boundary conditions such as the outer dimensions and the radius of the conducting wire. The optimal coil is found from this set after a twofold selection, namely on the self inductance value and on the uniformity of the vertical magnetic field, which was evaluated using a cost function. The algorithm is straightforward and based on closed expressions, which leads to a rapid execution of the procedure. We evaluated the algorithm on a representative reference configuration. The best coil of the large set was selected and the quasi-uniform field distribution of this coil was confirmed by experimental verification.
Author(s): B. Minnaert, L. De Strycker, N. Stevens
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: Mutual Coupling Reduction of Closely Spaced MIMO Antenna Using Frequency Selective Surface based on Metamaterials
Abstract: A new structure for mutual coupling reduction, which is using the application of Frequency Selective Surface (FSS) based on metamaterials is presented in this paper. In this method, first a customdesigned unitcell is presented that provides a proper S12 response for the mutual coupling reduction and then, this unitcell is used in a two-element array of wideband dipoles. According to the results, this unitcell provides a maximum reduction of 15dB in the frequency response of the antenna array, while it does not have a considerable effect on the reflection coefficient and radiation pattern of the antenna. To verify the results, the antenna is fabricated and measured and there is a very good agreement between the simulation and measurement.
Author(s): M. D. Ardakani, R. Amiri
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1892 KB

Title: A Double Modal Parameter Tracking Method To Characteristic Modes Analysis
Abstract: Mode tracking plays an important role in characteristic modes analysis. However, mode tracking in a proper and efficient way is still a challenging work. Based on modal linear correlation and modal stability, a double modal parameter tracking method is proposed in this paper, which is to track modes by correlating eigenvector and calculating the stability of characteristic angle simultaneously. To eliminate ambiguity case of multi-mode mapping one mode, two sorted mode with max Pearson correlation coefficient are identified same mode by utilizing saving best function. In order to verify accuracy and efficiency of the proposed method, four representative structures are analyzed. It can be observed that the proposed tracking method works better than the traditional methods.
Author(s): Q. He, Z. Gong, H. Ke, L. Guan
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: Analysis of Transient Scattering from a PEC Coated with Thin Dispersive Dielectric Layer
Abstract: A marching-on-in-time (MOT) based time domain thin dielectric sheet (TDS) method is proposed for analyzing the transient electromagnetic scattering from the perfect electrically conducting (PEC) body coated with thin dispersive material. The sources in the thin dielectric layer are all replaced by the current densities of PEC. A recursive convolution method is utilized to deal with the dispersive properties. The performance of accuracy and stability are investigated numerically.
Author(s): Y. L. Hu, Q. S. Man, D. Z. Ding, R. S. Chen
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1684 KB

Title: RFID Humidity Sensor Tag for Low-cost Applications
Abstract: This article presents a low-cost, flexible, chipless Radio Frequency Identification (RFID) tag for humidity monitoring applications. The tag exhibits moisture sensing feature within a compact geometrical dimension of 20mm x 17.6mm. The design is loaded with 12 resonators, where each resonator represents 1 bit in the frequency domain. For the designed 12-bit tag, 11 inverted C-shaped resonators are dedicated for encoding 11-bit information in their spectral signature. An integrated meandered-shaped resonator, covered with moisture sensitive Kaptonģ HN film, functions as a 1-bit moisture sensor. It is deployed for monitoring relative humidity (RH) levels, simultaneously. The passive RFID tag is realized on Taconic TLX-0 and has an operational bandwidth of 2.62 GHz. Furthermore, the design is modeled and analyzed for multiple substrates. The performance of the sensor tag for various humidity levels indicates that it is a potential solution for inexpensive sensing applications.
Author(s): A. Ali, S. I. Jafri, A. Habib, Y. Amin, H. Tenhunen
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: Modal Analysis of Different Stator Configurations to Mitigate Electromagnetically Excited Audible Noise and Vibrations of Switched Reluctance Motors
Abstract: The primary objective of this paper was to investigate different stator configurations of switched reluctance motors (SRM) in order to mitigate electromagnetically exited audible noise and vibration. We analyzed natural frequencies of different SRM stator configurations by virtue of modal analysis theory. The three-dimensional numerical modeling of SRM stator geometry was performed by using finite element method. Based on the output results, we propose the solutions on how to select an appropriate stator configuration in order to increase its natural frequencies beyond the resonant operational frequency, and thus, to mitigate the resulting audible noise and vibration. The numerical and analytical results are successfully compared to the published data.
Author(s): S. Corovic, R. Benedetic, D. Miljavec
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 2009 KB

Title: Shielding Effectiveness Improvement of Non-Metallic Transparent Enclosures Using Gold Nano-Layer Deposition
Abstract: In this paper we present the results of a simple optically transparent enclosure with efficient electromagnetic shielding. Firstly, Indium Tin Oxide (ITO) enclosures are designed for simultaneously providing high transmittance within a visible range and good shielding effectiveness (SE), where weight reduction, small size, and transparency are challenges. In the next step, gold Nano-layer films of various thicknesses are deposited on the patterned ITO glass using the thermal evaporation method. Then, by making a trade-off between optical transparency and SE, an optimized gold film thickness is selected. To assess the proposed approach, the final experimental results of copper, ITO, and gold deposited enclosures are compared. The results showed that a 9nm gold deposited ITO enclosure, provides efficient electromagnetic shielding better than the ITO enclosure (about 15 dB better at the resonance frequency and much closer to the copper enclosure) and at the same time, acceptable optical transparency.
Author(s): M. Ghiyasvand, M. Naser-Moghadasi, A. A. Lotfi-Neyestank, A. Nikfarjam
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1998 KB

Title: Characterization of 4 Element Compact Microstrip Patch Antenna Array for Efficient Null Steering
Abstract: Null steering in radiation pattern of linear antenna array is essential for minimizing degradation in signal-to-noise ratio performance due to undesired interference. High directivity and miniaturization are other key factors for proficient design of antenna arrays. Thus, the development of small sized antenna elements with high directivity is strategic point of interest. Consequently, the four element bowtie patch antenna array has been designed and simulated using IE3D software, and compared with conventional rectangular patch antenna array. Null steering is performed by varying element excitations in isotropic antenna array, rectangular patch antenna array and bowtie patch antenna array with main emphasis on position and depth of nulls to analyze the radiation characteristics of the designed models. The mutual coupling effects at different inter-element spacings are also presented for both the designed arrays. It has been observed that using bowtie patches as the element in the array brings about comparatively more effective null steering, and enhances the performance of the array as compared to the conventional rectangular patches.
Author(s): B. Kaur, A. Marwaha, S. Rani
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1719 KB

Title: Advanced Statistical 3D Models of Composite Materials for Microwave Electromagnetic Compatibility Applications
Abstract: This article describes advanced tridimensional time domain tools for characterizing composite structures in EMC context. Because of current high interests from industrial areas (e.g., automotive, and/or aerospace), many domains are demanding for reliable and accurate numerical tools to characterize such materials. In this framework, a particular care is granted to mixing theories. This article will demonstrate the interest of trustworthy statistical tools to check at the same time the validity of electromagnetic mixing rules and to realistically calibrate these models.
Author(s): S. Lallechere
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1987 KB

Title: Circularly Polarized Aperture-Coupled Microstrip-Line Fed Array Antenna for WiMAX/C Bands Applications
Abstract: In this paper, a new configuration of broad band circularly polarized (CP) array antenna is presented by a modified feeding network The proposed feed network includes two hybrid 90-degree branch line coupler and a 180-degree rat-race coupler. The feed network of array provides sequential rotation condition for consisting of four L-shaped microstrip lines which coupling through four ring-shaped slots. Each element of array is printed on two layer of substrate which connected together with a ring aperture. Employing wideband CP elements and feeding network structure causes the creation of innovation at CP array. The 3dB axial-ratio bandwidth of the array extends to approximately 650 MHz with impedance bandwidths of 24.7% for C-band applications and a relative high gain of about 10.2 dBic. The performance of the antenna has been approved by comparing between measurement and simulation results.
Author(s): V. Rafiei, H. Saygin, S. Karamzadeh
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1826 KB

Title: A Broadband Dual-Polarized Antenna for TD-SCDMA System
Abstract: A broadband dual-polarized antenna is proposed for TD-SCDMA system. The dual-polarized antenna is combined with two perpendicularly crossed dipoles. Crossed dipoles can reduce the same frequency interference and improve the signal reception effect. The isolation of this dual-polarized antenna is greater than 25 dB for co-polarization and 28 dB for cross-polarization. The measured results demonstrate that voltage standing wave ratio (VSWR) is no more than 1.3 at the operating frequency and the antenna has an average gain of 8.3 dBi for slant polarizations. That is, our proposed antenna meets the requirements for stringent design. We use array antenna technology based on the requirements of gain and beam tilt. A 5-element dual polarized antenna array is realized by 5-way unequal power divider at 1880 - 2635 MHz. The antenna gain of the array is about 12.5 dBi for different polarization. In numerical and measured results, the specific design methods and ideas of antenna and power divider are presented. As we can see from the test results, the antenna presented in this paper is far better than the industry standard.
Author(s): Z. Liu, Y. Li, J. Liu, Y. Zhang, X. Wu, Y. Zhou
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1870 KB

Title: Frequency and Time Domain Analysis of Planar UWB Antenna Controllable WIMAX/WLAN Band-Notched Characteristics
Abstract: An ultra wideband (UWB) printed monopole antenna with dual band stop characteristics is proposed in this article. Distinctive feature of this antenna is the notched band control ability with improved operating bandwidth. By employing modified lambda/2 vertically combined T and U-shaped conductor backed plane, a sharp band notch is achieved with notched band of 3.3Ė 3.7 GHz. In order to obtain another notched frequency band of 5.1-6 GHz, a rectangular spiral shaped lambda/4 open stub has been incorporated to the microstrip feed line. Frequency rejection performance can be controlled flexibly by varying various parameters and positions of the corresponding band notched elements. Furthermore, additional resonance at higher frequencies has been generated by introducing a metal loaded complimentary split ring resonator (MLCSRR) to the ground plane, so that it provides enhanced usable fractional bandwidth (2.6-13.9 GHz) more than 136%. The performance of the proposed antenna is analyzed both in frequency and time domain to assess its suitability in UWB communication
Author(s): R. Sanyal, D. Bhowmik, P. P. Sarkar, S. K. Chowdhury
File Type: 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 0.3Ė3 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
Download Link:Click here to download PDF     File Size: 1551 KB

Title: Simple Configuration Low-pass Filter with Very Wide Stop Band
Abstract: In this paper, a compact microstrip low-pass filter with elliptic-function response is presented. A halfring along with two half-elliptic patch resonators is cascaded to design a compact low-pass filter with very wide stop band and high selectivity in a small circuit area. This filter has the stop band from 3.3 up to 27.57 GHz with attenuation level better than -20 dB. The proposed filter has low insertion loss in the pass band and stop band, high return loss (RL), and very wide rejection in the stop band, along with compact size and simple configuration .The filter is designed, fabricated and measured. Simulation and measurement results are presented and compared to previous researches. The results of simulations and measurements are in agreement.
Author(s): B. F. Ganji, M. Samadbeik, A. Ramezani, A. Mousavi
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
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Title: GA Optimization of the Optical Directional Coupler
Abstract: Optical couplers, which are passive devices, couple optic waves through optical waveguides and can be employed in many applications, including power splitters, optical switches, wavelength filters, polarization selectors, etc. In this work, a simple, fast and instant optimization design is presented for an optical directional coupler based on Genetic Algorithms (GA). This optimization design is preferred due to its favourable usage and fast convergence capability. Finally, the designed methodology has been analytically and experimentally evaluated and the results show that the GA is an advantageous method for designing an optical element where the measurable data is obtainable instead of complex formulas.
Author(s): P. Ozkan-Bakbak
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1934 KB

Title: Phased Array Beam Steering Through Serial Control of the Phase Shifters
Abstract: The commands to control the phases shifters in a phased array can be sent through a parallel or serial channel. Parallel commands simultaneously change the phase shifters, allowing the beam to nearly instantaneously hop from one direction to another. If a serial channel is used, then the commands are sequentially sent to the phase shifters. The sequential approach causes the beam to gradually move from one position to another, rather than the quick hop encountered with a parallel channel. This paper shows simulated results of the behavior of the array factor due to serial phase shifting and effects the element sequence has on that behavior and a method to optimize the command sequence.
Author(s): R. L. Haupt
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1600 KB

Title: Merging VSimís Model Building and Visualization Tools with Custom FDTD Engines
Abstract: This work demonstrates how the graphical user interface of VSim (electromagnetic simulation software package) is modified and utilized to run a custom finite difference time domain algorithm. Commercial programs typically offer conventional FDTD functionality. More often than not, researchers may want to use their own code versions with proprietary modelling tools and extensions; for example, high-order differencing or specialized absorbing boundary conditions. VSim offers the flexibility of integrating an independent FDTD solver-engine that is tailored for the end userís needs. A detailed example is presented here of the replacement of VSimís own FDTD engine with a high-order FDTD code written with CUDA Fortran. Other custom FDTD codes could be integrated using the presented procedure.
Author(s): R. Smith, A. Weiss, R. Bollimuntha, S. DMello, M. Piket-May, M. Hadi, A. Elsherbeni
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1895 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: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1757 KB

Title: Slotted Triangular Monopole Antenna for UHF RFID Readers
Abstract: A new compact slotted triangular monopole antenna for ultra-high frequency (UHF) radio frequency identification (RFID) applications is presented. The antenna exhibits an omnidirectional radiation pattern and has a bandwidth (BW) of more than 13%. It covers the global UHF RFID band and has a maximum gain of around 2.6 dBi. An overview of the antenna design along with the full wave simulation is provided. A prototype of the antenna is fabricated and tested. Good agreement is obtained between simulated and measured results. Moreover, the antenna is used with a UHF RFID reader in real use cases where read range and read rate with different commercial tags are used to evaluate the antenna performance.
Author(s): K. ElMahgoub
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1842 KB

Title: A Broadband Microstrip-to-Microstrip Vertical Via Interconnection for Low Temperature Co-Fired Ceramic Applications
Abstract: This letter presents a microstrip-to-microstrip vertical via interconnect in microwave low temperature co-fired ceramic (LTCC) technology. According to the simulation results, the insertion loss is less than 0.33 dB and the return loss is greater than 29.9 dB from 0.3 GHz to 18 GHz. An equivalent lumped model is developed for analyzing the microstrip-to-microstrip vertical interconnection. The structure has been manufactured and measured.
Author(s): Y. Liu, L. Xia, R. Xu
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1643 KB

Title: Metamaterial Inspired Square Ring Monopole Antenna for WLAN Applications
Abstract: This paper describes the design of a compact dual band monopole antenna using a metamaterial inspired split ring structure for WLAN (2.4/5.2/5.5 GHz) applications. The antenna is printed on a 20x20x0.8 mm3 FR-4 substrate. It consists of two concentric square rings with a partial ground plane and is fed by a microstrip line. A split in the outer ring is introduced to induce magnetic resonance which in turn yields a narrow lower band resonance at 2.4 GHz. The position of the split in the ring plays a vital role in inducing the magnetic resonance. The extraction of negative permeability of the ring structure with and without the split is discussed to verify the metamaterial property existence. A prototype of the proposed structure is fabricated and the measured results comply greatly with the simulated results. The antenna has consistent radiation pattern over all the working region.
Author(s): S. Imaculate Rosaline, S. Raghavan
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1580 KB

Title: Mutual Coupling Characterization of Ultra-Wideband U-Slot Microstrip Patch Array Antennas
Abstract: Ultra-wideband (UWB) phased arrays are increasingly used in radar and medical applications. Mutual coupling reduction between the phased array elements is critical in achieving good scan bandwidth. This study investigates the mutual coupling of a UWB U-slot microstrip patch 2-element array to find the patch orientation and U-slot topology with the least mutual coupling. Electromagnetic (EM) simulation results indicate that, for epsilon r = 2.2 substrate, diamond patch orientation with opposite U-slot topology has the least coupling between the array elements. Results also indicate that the current density distribution on the microstrip patch has an effect on mutual coupling between the array elements. Results show good agreement between MoM and FEM EM solvers.
Author(s): M. M. Elsewe, D. Chatterjee
File Type: Journal Paper
Issue:Volume: 32      Number: 12      Year: 2017
Download Link:Click here to download PDF     File Size: 1864 KB