ACES Publication Search
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| Title: | ACES Journal April 2021 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2220 KB |
| Title: | ACES Journal April 2021 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 12428 KB |
| Title: | ACES Journal April 2021 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 26594 KB |
| Title: | A Numerically Efficient Technique for the Analysis of Metamaterial- and Metasurface-based Antennas |
| Abstract: | Metasurface-based antennas have received considerable recent attention in recent years because they are not only useful for designing new antennas, but for improving the performance of legacy designs as well. However, systematically designing these antennas is challenging because the antennas are usually multiscale in nature and they typically require a long time when simulated by using commercial solvers. In this work, we present a new approach for analyzing antennas that utilize Metasurfaces (MTSs) and Metamaterial (MTMs). The proposed method departs from the widely used technique based on an anisotropic impedance representation of the surface and relies on an equivalent medium approach instead. The principal advantage of the proposed approach is that such an equivalent medium representation can be conveniently inserted directly in commercial EM solvers, circumventing the need to develop special numerical EM simulation codes to handle metasurfaces. Several illustrative examples are presented in the paper to demonstrate the efficacy of the present approach when simulating MTS- and MTMbased antennas. |
| Author(s): | A. Nasri, R. Mittra, A. Ghalib, B. Hakim, H. Rmili |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2313 KB |
| Title: | Focusing Technique for Holographic Subsurface Radar Based on Image Entropy |
| Abstract: | An image focusing method for holographic subsurface radar (HSR) is proposed herein. HSR is increasingly being utilized to survey objects buried at shallow depths and the acquired signals are converted into an image by a reconstruction algorithm. However, that algorithm requires actual depth and material information or depends on human decisions. In this paper, an entropy-based image focusing technique is proposed and validated by numerical simulation software package based on finite-difference time-domain method and experiment. The resulting images show good agreement with the actual positions and shapes of the targets. |
| Author(s): | H. Jung, D.-J. Yun, H. Kang |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1498 KB |
| Title: | New Approach of Efficiency Improvement in 10 dB Doherty Power Amplifier for 4G LTE and 5G Wireless Applications |
| Abstract: | In this research article, the design procedure and comparative analysis of the 10 dB Doherty power amplifier (DPA) with single and double auxiliary amplifier for maximum efficiency has been presented. A new Doherty amplifier structure with parallel two auxiliary amplifiers based on conventional design having optimum value of load resistance of 3.162 ohm has been proposed with higher efficiency of 85.803% and analyzed with n-tone sinusoidal signal. The proposed Doherty power amplifier can achieve drain efficiency of 83.299% & with single and 85.803% with dual auxiliary amplifier at the output power back, off of 10 dB from the saturated power point. The simulated outputs are matched with mathematically derived design values. The simulated n-tone time response shows that the proposed design of DPA can able to handle different modulation standards at different frequencies with compatible structure. |
| Author(s): | S. Santhanam, P. T. Selvan |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1566 KB |
| Title: | Thermal Effects of 5G Frequency EM Waves on Ocular Tissue |
| Abstract: | This research article aims to investigate the thermal effects on human eye due to exposure of EM (electromagnetic) field at 5G frequencies. A secondary purpose of the article is to show that SPICE, one of the most commonly used tools in circuit analysis, can be used to solve complex EM and bioheat transfer problems. Both electric field and temperature distributions in human eye are simulated with transmission line modelling (TLM) method. Also, finite element method (FEM) calculations are carried out for comparison. Temperature distributions are calculated for 30 minutes of EM radiation exposure. As a subject of the simulation, a human is chosen that the power density of incoming field at the human eye is assumed as the maximum of the ICNIRP general public exposure limits. A good consistency between TLM and FEM based simulations is found. A new transmission line model based on Debye parametric model is generated for simulation of EM field distribution in the tissues. With this generated transmission line, the results for the frequencies of interest can be obtained via single simulation. Also, a new transmission line model is developed for the temperature distribution simulation in which the effects of noncompressible fluid flow such as non-unidirectional blood flow in tissues and flow in aqueous humor are taken into consideration. |
| Author(s): | B. Aricioglu, A. Ferikoglu |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1834 KB |
| Title: | Dual-Band Bandpass Filter Optimized for High Q-Factor |
| Abstract: | High quality factor bandpass filters based on a number of cascaded resonators of dual-resonance mechanism are proposed in the present paper. Each resonator is constructed as two overlapped coplanar waveguide (CPW) resonant structures. The cascaded resonators mediate microwave coupling between two isolated corner-shaped CPW feeders only at the resonant frequencies leading to a bandpass filter of high quality factor. The two resonant frequencies and the separation between them can be fine-tuned by the dimensions of the structure. The effects of the dimensional parameters of the resonator and the feeding CPW regions on the resonant frequencies and the performance of the bandpass filter are investigated. The effect of the loss tangent of the dielectric substrate material on the quality factors at the two resonant frequencies is studied. Three prototypes of the proposed filter are fabricated and experimentally studied for more understanding of the underlying physical principles of operation and for verifying some of the simulation results. The experimental results show good agreement when compared with the corresponding simulation results. It is shown that, at low enough absolute temperature, the proposed structure can operate as superconducting microwave resonator when made from the appropriate materials. Also, it is shown that an optimized design of the proposed bandpass filter, based on superconducting CPWR structure, can achieve quality factors high enough to form a quantum data bus for hybrid architecture of quantum information systems. |
| Author(s): | W. M. Fahmy, A. E. Farahat, K. F. A. Hussein, A.-E.-H. A. Ammar |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2167 KB |
| 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 |
| Download Link: | Click here to download PDF File Size: 1682 KB |
| Title: | Performance Evaluation of SDR Blade RF using Wide-band Monopole Antenna for Spectrum Sensing Applications |
| Abstract: | A spectrum-sensing algorithm is used to detect the available and the occupied frequency bands. The wideband antenna design approach is used for a microstrip fed monopole antenna that can be used for various wireless technologies such as GSM, UMTS, LTE, and WiFi operating at different frequencies from 1.25 to 3 GHz. The antenna is constructed from two copper layers of rectangular radiator and a partial ground plane. These layers are printed on an RO4003 substrate with dimensions 60 x 80 mm2. The antenna is experimentally fabricated to verify the simulation predictions and good matching between simulated and measured results is achieved. The wide-band antenna is tested by connecting it to the receiver of the Blade-RF Software Defined Radio (SDR) platform. A matlab script is then used to control the SDR board and to perform Spectrum Sensing for Cognitive Radio Applications. |
| Author(s): | A. A. Ibrahim, W. A. E. Ali, H. Aboushady |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1337 KB |
| Title: | Analysis and Modeling of Film Capacitor Radiation Generic Radiating Model for the Rectangular Capacitors |
| Abstract: | Capacitors are sources of EM field emissions whose characterization is crucial for electronic circuits EMC. This paper presents the modeling of equivalent radiating sources of rectangular film capacitors. It presents and analyses the magnetic near field measured above plastic and polyester capacitors. The measurements are then used by the inverse method to create a radiating source model for the capacitor. The results show a good agreement between the measured cartography and the one obtained when using radiating sources model. Finally, a generic radiating model is proposed for various types of rectangular film capacitors. The generic model is validated using the measurements on a rectangular capacitor. The suggested radiating model accelerates solving the inverse method. It can be used by circuit designers to optimize the placement of capacitors on the printed circuit board to reduce their coupling with other components of the studied system. |
| Author(s): | W. Labiedh, B. Zitouna, M. Tlig, J. B. H. Slama |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 2322 KB |
| Title: | Prediction and Suppression of Twisted-wire Pair Crosstalk Based on Beetle Swarm Optimization Algorithm |
| Abstract: | Based on the theory of multi-conductor transmission lines (MTL), this paper proposes a new method for predicting and suppressing crosstalk of twisted-wire pair (TWP). The per unit length (p.u.l) RLCG parameters change caused by the inconsistent cross-sectional shape of TWP, changes in parameters make it difficult to solve the telegraph equation. In this paper, the method of transmission lines cascade is used. TWP is divided into several segments, and p.u.l parameters of each segment are predicted. Compared with before method, we propose a higher precision algorithm—beetle swarm optimization (BSO) to optimize the weights of back-propagation (BP) neural network, which predict p.u.l parameters at each segment. On this basis, it is divided into two steps: 1) Use MTL frequency domain method combined with lines’ terminal conditions to solve crosstalk and compare with CST simulation results; 2) Use the singular value decomposition (SVD) method to add matrix modules at both ends of lines for suppressing crosstalk. The results show that proposed method in this paper is consistent with the simulation, and the accuracy is higher than before. |
| Author(s): | J. Zhou, S. Li, W. Zhang, W. Yan, Y. Zhao, Y. Ji, X. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1792 KB |
| Title: | Improvement of Shaped Conductive Backfill Material for Grounding Systems |
| Abstract: | In this paper, some improvements have been proposed for low resistance shaped conductive backfill material (SCBM) based on finite-difference timedomain (FDTD) simulations in grounding systems. It is found SCBM can be produced by conjunction of several layers with conductivity decreasing gradually from inner layer to outer layer, and smooth conductivity reduction between layers would lead to a better grounding performance. It is also found cuboid shape is a much more efficient shape than cube and cylinder shapes for SCBM, and holes can be made on the SCBM’s main body. It suggested to bury SCBM vertically when ground soil permits, otherwise bury SCBM horizontally and deeper burying depth would result in smaller grounding resistance. Results show it is not needed to connect the SCBMs one by one tightly in series SCBM, and some distances is allowed without dramatically increasing grounding resistance. |
| Author(s): | R. Xiong, Q. Yin, W. Yang, Y. Liu, J. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1729 KB |
| Title: | Research on the Influence of Train Speed Change on the EMI of Pantograph-Catenary Arc to Main Navigation Stations |
| Abstract: | The electromagnetic interference (EMI) of the pantograph-catenary arc (PCA) to the main navigation stations will be affected when the speed of the high-speed train is changed. In order to study the influence of the speed change, we measured and analyzed the electric field intensity of the PCA generated at common and neutral section of power supply line at different train speeds. The frequency range in this study is the frequency of the main navigation stations (108 ~ 336 MHz). Both theoretical and experimental results show that PCA radiation increases with the increase of train speed. Besides, we calculated the maximum train speed without interfering the navigation signal. This work is useful for estimating EMI of the PCA at different train speeds and mitigating the interference to the navigation station near the highspeed railway by proposing corresponding speed limits. |
| Author(s): | Y. Tang, F. Zhu, Y. Chenv |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1415 KB |
| Title: | A MIMO Antenna with Enhanced Gain using Metasurface |
| Abstract: | This paper proposes a new metasurface to improve gain for dipole antenna. The antenna includes two sets of two elements (1 x 2), the integrated J shaped baluns, five metasurface cells (each metasurface cell consists of 5 periodic metallic plates printed on a thin low-cost FR4 substrate) for four antenna elements and the antenna is supplied by two T-junction power dividers. The metasurface is designed to operate as reflection surface. The antenna is designed based on RT5880 and witnesses an overall size of 140 x 37 x 35.075 mm3 (2.7λ x 0.71λ x 0.67λ at 5.8 GHz), an isolation of approximately 28 dB, a peak gain of 9.5 dBi, and a radiation efficiency of 84% |
| Author(s): | L. N. Nguyen |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1857 KB |
| Title: | MIMO Antenna Based on Metamaterial Frequency Selective Surface |
| Abstract: | In this paper, a metamaterial-based novel antenna-mutual-coupling reduction structure is proposed and demonstrated. The structure consists of a threelayer metamaterial frequency selective surface (MFSS) superstrate with split-ring resonators and metal grids. The MFSS means metamaterial frequency selective surface that has the metamaterial performance along the substrate and the frequency selective characteristic on the normal direction of the antenna array simultaneously. A 1×2 MIMO antenna that has a short edge-to-edge distance (0.037λ0) is designed as an illustration to demonstrate the validity of the meta-surface for mutual. When loaded with the proposed MFSS, the mutual coupling between the antenna elements is significantly reduced and the gain of the antenna array is improved by 2.5 dBi. |
| Author(s): | S. Luo, Y. Li, C.-Y.-D. Sim, Y. Xia, X. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1547 KB |
| Title: | Design of Dual Band Meta-Material Resonator Sensor for Material Characterization |
| Abstract: | This paper describes the design and implementation of the dual band metamaterial resonator for sensing applications by employing perturbation theory in which the dielectric properties of resonator affect Q-factor and resonance frequency. The designed sensor operates at two resonance frequency 3.20 GHz and 4.18 GHz in the range of 1 GHz to 5.5 GHz for testing solid materials. The Computer Simulation Technology (CST) software is used to design and model this sensor and it was analyzed by using vector network analyzer (VNA) for testing measurement. This study uses empirical equation from the tested materials with well-known permittivity to estimate the permittivity of other materials with unknown permittivity. The proposed sensor has achieved a narrow band with high Q-factor value of 642 and 521 at the operating frequencies of 3.16 GHz and 4.18 GHz respectively. These findings are compared with findings of previous study and the proposed sensor has achieved a high sensitivity and accuracy of 80% compare to others. This is proof that this senor could be used to characterize materials and sensing applications. |
| Author(s): | S. R. Harry, Z. Zakaria, M. A. M. Said, M. H. Misran |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1262 KB |
| Title: | Miniature Dual Band Button Antenna Using Cylindrical Dielectric Resonator Antenna for On/Off Body Communication Devices |
| Abstract: | This paper presents miniature dual-band cylindrical dielectric resonator antenna (CDRA) based on button antenna for wireless body area network (WBAN) applications. A button antenna is designed by stacking two CDRAs (low and high permittivity) fed by coaxial probe through the ground plane and penetrates the bottom CDRA. The prime contributions of using DRAs are to enhance the performance and to provide a compact size of antenna. However, the coaxial probe realizes two radiation patterns, monopole and broadside patterns. A comprehensive validation using CST microwave studio is carried out to determine the characteristics of the proposed button antenna. In addition, to ensure that the results are acceptable to the practitioner in this field, a prototype was fabricated and tested. The superiority of the proposed antenna is confirmed by possessing 39% more compact size compared to previously reported studies, efficiency of more than 63% and bandwidth of 4.9% and 6.6% for lower and upper band, respectively. This proposed design is a promising candidate to benefit on/off body communication devices operating at 2.4 and 5.6 GHz. |
| Author(s): | M. K. Banafaa, M. H. Jamaluddin, S. H. Dahlan, A. A. Althuwayb |
| File Type: | Journal Paper |
| Issue: | Volume: 36 Number: 4 Year: 2021 |
| Download Link: | Click here to download PDF File Size: 1466 KB |