ACES Publication Search
There are 23 search results for:
| Title: | ACES Journal October 2020 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2197 KB |
| Title: | ACES Journal October 2020 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 7127 KB |
| Title: | ACES Journal October 2020 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 28330 KB |
| Title: | A-posteriori Estimation of Random Uncertainty for the Reflection Type Q-factor Measurements |
| Abstract: | A frequently used Q factor measurement procedure consists of determining the values of the input reflection coefficient vs. frequency with the use of a network analyzer, and processing the measured values with a data-fitting procedure to evaluate the location and the size of the corresponding Q-circle. That information is then used to compute the value of the loaded and unloaded Q factors and the coupling coefficient of the resonator being tested. This paper describes a novel method of post-processing the measured data, which also provides information on the uncertainty of the obtained results. Numerical examples show that this a-posteriori procedure can not only provide the uncertainty estimates but also improve the accuracy of results, even in the presence of a significant level of random measurement noise. |
| Author(s): | D. Kajfez |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2209 KB |
| Title: | Parametric Investigation and Analysis of an Electric-LC Resonator by Using LC Circuit Model |
| Abstract: | Electric-LC resonators (ELCs) metamaterials, as a kind of common structures, have been extensively investigated from microwave to terahertz frequencies. In this paper, we present a LC circuit model to analyze electric-LC resonator. With the reliable and closed formulas of the effective inductance and capacitance, the expressions of electric and magnetic resonance frequencies were obtained, which is suitable to discuss the resonance characteristic under the normal incidence case. Meanwhile, the mutual relationships among the permittivity, permeability, refractive index, and structure parameters can be explored by using the obtained expressions. Numerical simulations and theoretical calculations reveal that the width and length of the gaps are some of the critical parameters determining the resonator frequency of the example metamaterial. This study provides valuable information for designing the desired left-hand metamaterial at some specific frequency points. |
| Author(s): | H. Xiong, X.-M. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1510 KB |
| 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 |
| Download Link: | Click here to download PDF File Size: 1903 KB |
| Title: | An Efficient Parallel Hybrid Method of FEM-MLFMA for Electromagnetic Radiation and Scattering Analysis of Separated Objects |
| Abstract: | In order to meet the rapidly increasing demand for accurate and efficient analysis of complex radiating or scattering structures in the presence of electrically large objects, a finite element method (FEM)-multilevel fast multipole algorithm (MLFMA) hybrid method that based on the Finite Element-Iterative Integral Equation Evaluation (FE-IIEE) mesh truncation technique is proposed in this paper. The present method makes use of FEM for the regions with small and complex features and MLFMA for the analysis of the electrically large objects, which ensure the accuracy and applicability of the method are better than most commonly adopted FEM-high frequency technique (HFT) hybrid method. The mutual interactions between regions are taken into account in a fully coupled way through iterative near filed computation process. In order to achieve an excellent performance, both algorithms have been implemented together from scratch, being able to run over multi CPU cores. An efficient parallel FEM domain decomposition method (DDM) solver with exploiting geometrical repetitions is included to drastically reduce memory requirements and computational time in the calculation of large array antenna. Also, the parallel MLFMA is adopted to expedite the near-field information exchange between regions. Through numerical example, the effect of distance between regions on the convergence of the proposed hybrid method is studied, and it is shown that the proposed method converge well even if the distance is equal to 0.05λ. Through comparisons with an in-house higher order method of moments (HOMoM) code and commercial software FEKO, the accuracy and effectiveness of the implemented parallel hybrid method are validated showing excellent performance. |
| Author(s): | S. Zuo, Z. Lin, Z. Yue, D. Garcia Donoro, Y. Zhang, X. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2043 KB |
| Title: | Derivation of Far-field Gain Using a Gain Reduction Effect in the Fresnel Region |
| Abstract: | A handy method of calculating far-field gain based on the magnitude of the power transmission in a Fresnel region is presented, which can be applied to the phaseless near-field measurement. Due to the short range inside an anechoic chamber, the probe antenna is often placed in the Fresnel region of the antenna under test (AUT). It is well-known that far-field gain of an antenna gradually reduces when one antenna moves to the other one placed in a proximity distance. This fact can be advantageously applied to estimate the far-field gain in a far-field region. The proposed method offers rapid estimation of the far-field gain based on the simple input knowledge such as the probe antenna gain and the magnitude of the power transmission and the separation distance between AUT and probe antenna. The proposed method can be applicable to a wide range of microwave antennas. This feature makes it possible to offer preliminary measurement results and reference parameters of the measurement for the various types of microwave antennas. |
| Author(s): | I. Kim, S.-G. Lee, J.-H. Lee |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2405 KB |
| Title: | Noise Analysis Method of Radiated EMI based on Non-linear Principal Component Analysis |
| Abstract: | Aiming at the radiated electromagnetic interference (EMI) noise of electronic equipment, a novel method of radiated EMI noise analysis based on non-linear principal component analysis (NLPCA) algorithm is proposed in this paper. In order to obtain multiple independent common-mode / differential-mode radiated sources, and to find the sources that cause the radiated noises that exceed the limit of standard, NLPCA algorithm is used to process the near-field radiated signals superimposed by multiple radiated sources. The simulation results show that NLPCA can successfully screen out the radiated EMI noises which exceed the limit of standard. Moreover, the experiments are carried out with three models: double-common-mode hybrid sources, double-differential-mode hybrid sources and common-differential-mode hybrid sources. Compared with the traditional independent component algorithm (ICA), the method proposed in this paper can separate the radiated EMI noise sources more accurately and quickly. It can be concluded that the accuracy of NLPCA algorithm is 10% higher than ICA algorithm. This work will contribute to trace the radiated EMI noise sources, and to provide the theoretical basis for the future suppression. |
| Author(s): | Z. Zhu, W. Yan, Y. Wang, Y. Zhao, T. Zhang, J. Huang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1686 KB |
| Title: | Optimizing Processing Time of Radio-Astronomy Antenna Simulations Using FEKO |
| Abstract: | The far-field pattern of a geometrically large and complex antenna used in low-frequency radio astronomy is computationally expensive to simulate on electromagnetic simulators, such as FEKO. For example, one station of the Square Kilometer Array, which consists of 256 log-periodic antenna elements, will take years to simulate using the full CAD model for the full operational frequency band. This paper focuses on reducing the simulation time for a single antenna element by simplifying the simulation model, thus decreasing the number of unknowns that have to be solved in a simulation. An iterative process for optimizing the simplification of such an element is described, while keeping the reflection coefficient within 1 dB absolute mean deviation of the measured data. After four iterations, the amount of unknowns to be solved, which includes the number of triangles and segments, was reduced from 29,307 to 11,991. This decreased the computation time by 86.5%, making array simulations feasible. Using the techniques described in the paper, other antenna constructions can benefit from it and be simulated more efficiently. |
| Author(s): | R. Steiner, D. C. X. Ung, A. Hubrechsen, R. D. Jones, R. B. Wayth, M. J. Bentum, A. B. Smolders |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2485 KB |
| Title: | Modified Differential Evolution Algorithm for Time-Modulated Linear Array Antenna |
| Abstract: | A modified differential evolution (MDE) algorithm based on a novel mutation strategy and adaptive adjustment strategy of parameter crossover rate (CR) is proposed to improve the population diversity and to avoid frapping in local optima. Also the simplified quadratic interpolation is employed to accelerate the convergence rate. Benchmark functions have been provided to verify the MDE algorithm. Compared with other improved evolutionary algorithms, experiment results reveal that the MDE has a promising performance in the convergence rate and the exploration ability. Finally, the proposed algorithm is proved to realize accelerating the optimization of time-modulated arrays (TMA). |
| Author(s): | W. Liang, R. Li, J. Li, Z. Wu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1710 KB |
| Title: | Dual-Band Printed Monopole Antenna Design |
| Abstract: | Design procedure of a high gain dual-band printed monopole antenna, resonating at 2.4 GHz and 5.5 GHz, is presented. The proposed design meets the specifications required by WI-FI, WIMAX and radio frequency identification (RFID) reader applications. Our design utilizes Rogers RT/Duroid 5880(tm) substrate, and the major radiation element is an annular circular patch shape. The design was improved by adding a face-to-face fork shape metal inside the annular circular patch. The antenna feed consists of a microstrip line and a slotted transformer section for matching purpose. A prototype of the proposed antenna was fabricated and the measurements of the return loss and antenna radiation pattern were performed. The comparison between the results obtained from the simulation and the measurements showed an excellent agreement. |
| Author(s): | H. A. Ragheb, S. A. El-Aal, A. Saad, A. Zaalouk |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1586 KB |
| Title: | Concurrent Dual and Triple Band Square Ring Resonator Base-Band Filter using Metal-Insulator-Metal for Plasmonic Applications |
| Abstract: | Ring resonators are capable of providing high-quality factors with low insertion loss, which are the factors for considering it as a potential technique of guiding signal in the nanometer wavelengths. In this paper, a Nanoplasmonic configuration of a resonator comprising of the square ring known as Square Ring Resonator (SRR) is designed and analyzed for multiple band characteristics. The performance analysis of two different structures of the square ring resonators are presented in terms of the simulation reports like reflection and transmission coefficients, and field distribution plots. The designed Band Pass Filter (BPF) expressed excellent performance in the optical bands and hence are best suitable for Photonic Integrated Circuit (PIC) applications. |
| Author(s): | S. K. Bitra, S. Miriyala |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1908 KB |
| Title: | Parametric Analysis of an Optical Log-Spiral Nano-Antenna for Infrared Energy Harvesting |
| Abstract: | In this paper, we present the design of a spiral nano-antenna dedicated to infrared energy harvesting at 28.3 THz. A comprehensive, detailed parametric study of key parameters such as the initial angle at the origin arm , width of the spiral arms, gap between the two arms, thickness of substrate, length of substrate, thickness of patch and number of turns of the nano-antenna is also presented and discussed in order to harvest maximum electric field in the gap of the spiral antenna in the frequency range of 28 – 29 THz. The maximum electric field is simulated at 28.1, 28.3, 28.5 and 28.7 THz. A variation of the electric field of the antenna for different value of incident wave angle at the resonance frequency 28.3 THz has been simulated. The main advantages of the studied structure are its ability to reach high confined electric field within its gap, its wideband behavior around the operating frequency 28.3 THz, and its insensitivity to polarization of incident electromagnetic waves. |
| Author(s): | A. Alhomrani, A. Yahyaoui, A. Al Hashmi, A. Mersani, M. Nour, H. Rmili, R. Mittra |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2260 KB |
| Title: | Integrated Analysis and Optimization of the Large Airborne Radome-Enclosed Antenna System |
| Abstract: | In order to realize integrally analysis and optimization of the large airborne radome-enclosed antenna system, a novel optimization strategy is proposed based on an overlapping domain decomposition method by using higher-order MoM and out-of-core solver (HO-OC-DDM), and combining with adaptive mutation particle swarm optimization (AMPSO). The introduction of parallel out-of-core solver and DDM can effectively break the random access memory (RAM) limit. This strategy can decompose difficult-to-solve global optimization problems into multi-domain optimization problems by using domain decomposition method. Finally, take airborne Yagi antenna system as an example, the numerical results show that the design of large airborne radome-enclosed antenna system based on the proposed strategy is convenient and effective. |
| Author(s): | C. Zhai, X. Zhao, Z. Lin, Y. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1976 KB |
| Title: | A Compact Wideband Dual-Circular Polarization CPW-Fed Slot Antenna |
| Abstract: | A compact wideband coplanar waveguide (CPW) excited slot antenna with dual-circular polarization (DCP) is presented and fabricated in this paper. Two inverted-L-shaped patches are implanted in a square slot to achieve wideband DCP characteristic. The feed line is terminated on an inverted-L-shaped patch. Moreover, two rectangular slots are added on the corners of the antenna to improve the bandwidth of axial ratio (AR) and the voltage standing wave ratio (VSWR). The simulated results show that the designed antenna can generate a good impedance bandwidth of 70.4% and a 3-dB AR bandwidth of 48.6%, respectively. This antenna possesses the qualities of small size, simple structure, and good dual-circular polarization. |
| Author(s): | Z. N. Jiang, S. C. Huang, Z. X. Wang, X. Y. Zhao, T. Wan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2413 KB |
| Title: | Cross Polarized 2x2 LTE MIMO System for Automotive Shark Fin Application |
| Abstract: | In this research we propose two orthogonally placed FR4 printed planar monopole antenna elements for use in the automobile roof top shark fin antenna for LTE MIMO applications. The discussed MIMO antenna system is designed to cover the worldwide LTE frequency band from 698MHz to 2700MHz. The goal of this research is to achieve satisfactory MIMO performance across the whole band while staying within physical constraints of the shark fin style antenna. The target reflection coefficient (S11) of each element is -6dB. Because of physical constraints of the automotive shark fin design antenna MIMO decorrelation is achieved by cross polarization and small distance separation. Correlation better than -12dB is targeted and achieved in higher bands, while in lower frequency bands antennas would not benefit from MIMO performance. Numerical simulation of the MIMO antenna system is performed using FEKO in order to verify the design parameters. Simulation findings are confirmed by manufacturing antennas and testing in the lab. |
| Author(s): | D. Preradovic, D. N. Aloi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1455 KB |
| Title: | Compact Bandpass Filters Using Folded Quad-Mode Stub-Loaded Loop Resonators |
| Abstract: | Folded quad-mode stub-loaded loop resonators (QMSLLRs) are proposed for realizing both bandpass and dual-band bandpass filters with compact dimensions. The QMSLLR is a folded square loop loaded with four short stubs, providing structure symmetry in both transversal and longitudinal directions. Determined by the lengths of the loaded stubs, the four resonant frequencies as analyzed with even-odd mode method can be either distributed in one passband with equal space, or in two passbands with a guard band in between, for realizing a single-band bandpass filter or a dual-band bandpass filter, respectively. For both the input and output couplings, two perpendicular feeding lines are parallel coupled to the QMSLLR at one corner. The measure results prove that the structure is suitable for the design of a medium band or even narrow band bandpass filters with compact dimensions. |
| Author(s): | C. Liang, Y. Liu, F. Tai |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1760 KB |
| Title: | High Quality Factor using Nested Complementary Split Ring Resonator for Dielectric Properties of Solids Sample |
| Abstract: | A Nested complementary split ring resonator (CSRR) was proposed based on planar structure. The main objective of this work is to get a higher quality factor (Q-factor) with minimal error detection of complex permittivity. The sensor operated at the 3.37GHz resonant frequency and simulated by ANSYS HFSS software. Subsequently, the designed sensor has been fabricated and tested with the presence of several material under test (MUTs) placed over the sensor. The result achieved high unloaded Q-factor, 464. There has been proof of good agreement concerning the results between theoretical, simulation, and measured parameters of error detection, which is below 13.2% real part permittivity and 2.3% the loss tangent. The proposed sensor is practically useful for the food industry, bio-sensing, and pharmacy industry applications. |
| Author(s): | N. A. Rahman, Z. Zakaria, R. A. Rahim, M. A. M. Said, A. A. M. Bahar, R. A. Alahnomi, A. Alhegazi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1711 KB |
| Title: | Ground-Based Augmentation System Antenna Array Size Reduction via Self-Cardioid Element |
| Abstract: | A Ground-Based Augmentation System (GBAS) monitors the signals of Global Navigation Satellite Systems and broadcasts differential correction signals. It relies on Multipath Limiting Antennas (MLAs) that can receive signals over almost the entire upper hemisphere while greatly attenuating signals reflected from the ground. The current Federal Aviation Administration (FAA)-approved system utilizes an MLA that is approximately 182.9 cm tall. In this paper, a substitute MLA is designed that is only 97.05 cm tall (approximately 44% reduction). The size reduction is accomplished by reducing the number of array elements from 19 to 11. We developed a novel self-cardioid antenna element that allows for this reduction. |
| Author(s): | J. A. Quinlan, D. N. Aloi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1971 KB |
| Title: | Analysis and Design of a Diplexer for Satellite Communication System |
| Abstract: | This paper presents the design and analysis of a diplexer for satellite communication system based on hybrid spoof surface plasmon polariton (SSPP) and substrate integrated waveguide (SIW) transmission lines. The proposed diplexer consists of a SSPP printed line composed of H-shaped periodical grooved strips to operate as a low pass filter and a SIW to operate as a high pass filter. The operating frequency bands of the proposed diplexer are from 11.7 to 12.75 GHz for the downlink (DL) band, and from 17.3 to 18.35 GHz for the uplink (UL) band. These frequency bands correspond to the operating frequencies in Nile Sat 201 system. The frequencies of the DL and UL bands are adjusted independently by tuning the structure parameters of SSPP and SIW sections, respectively. The proposed hybrid SSPP-SIW diplexer is fabricated and measured. Simulated and measured results show good channel isolation, low return loss and low insertion loss in the required frequency bands. |
| Author(s): | E. M. Eldesouki, K. M. Ibrahim, A. M. Attiya |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1672 KB |
| Title: | Design and Analysis of Ultra-wideband and High Directive THz Photoconductive Vivaldi Antenna |
| Abstract: | In this work a novel design of an ultrawideband and highly directive Vivaldi photoconductive antenna (PCA) is reported for the first time for the THz sensing and imaging applications. The optical-to-THz conversion efficiency for the enhanced directivity of the reported PCA is enhanced by adding a hemispherical silicon-based lens with the PCA gold electrode and quartz substrate (εr = 3.78, tan δ = 0.0001). The optimization of the antenna design parameters is performed in CST MWS for the frequency range of 1-6 THz. The design antenna has UWB -10 dB impedance and 3-dB AR bandwidths of 6 THz, maximum directivity of 10 dBi and maximum total radiation efficiency of > 40%. |
| Author(s): | J. Yousaf, A. Dhiflaoui, A. Yahyaoui, B. Hakim, M. Zarouan, W. Zouch, T. Aguili, H. Rmili |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2819 KB |
| Title: | Novel RFID Conformal Tag Antennas for Liquid Level Detection Applications |
| Abstract: | Detection of liquid level in large tanks is presented in this paper. The liquid level is detected using a transmitter and RFID tag antennas as a receiver. The transmitter antenna is a Vivaldi with wide bandwidth from 0.5 GHz to 3 GHz. The Vivaldi antenna is fabricated on FR4 with εr = 4.3 and thickness of 0.8 mm. Two conformal RFID tag antennas are used as receiver antennas. The conformal antenna is placed on Rogers Ultram 3850 flexible substrates with εr = 2.9 and a thickness of 0.1016 mm. The conformal antenna is designed to set on a cylindrical tank made from PVC material. The first tag works at 0.9 GHz and the second tag works at 2.45 GHz. Water and Oil are used as liquids for testing. The antennas are simulated using CST microwave studio simulator Ver.14. The system is also fabricated and measured. Good agreement is achieved between simulated and measured results. |
| Author(s): | B. H. El Swiefy, M. I. Ahmed, H. El Sadek, W. R. Anis |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 10 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1901 KB |