ACES Publication Search
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| Title: | ACES Journal July 2020 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2240 KB |
| Title: | ACES Journal July 2020 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 7129 KB |
| Title: | ACES Journal July 2020 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 20660 KB |
| Title: | Fast Monostatic RCS Computation Using the Near-Field Sparse Approximate Inverse and the Multilevel Fast Multipole Algorithm |
| Abstract: | This paper describes an iteration-free numerical approach for the analysis of the monostatic Radar Cross Section of arbitrary scenarios. The proposed method is based on a combination of the Sparse Approximate Inverse of the near-field coupling matrix and the Multilevel Fast Multipole Algorithm, and allows to bypass the iterative solution process maintaining a good degree of accuracy. |
| Author(s): | C. Delgado, F. Catedra |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1465 KB |
| Title: | An Analytical Method of Minimizing the Crosstalk of Curved Cable and Determining the Optimal Wiring |
| Abstract: | Crosstalk is an easily occurred electromagnetic interference between adjacent cables. Previous research on crosstalk mainly focused on straight cables, and seldom works are reported for bended cables which happens most often in applications. Thus, we propose an analytic method to minimize the crosstalk between curved cables and determine the optimal wiring rules within a specified frequency range. The procedure of the proposed method can be described as the following steps: Firstly, the theoretical crosstalk model of curved cables is deduced and verified by numerical simulation. Then, an “σ area” is defined as the evaluation parameter of crosstalk effects, which is devoted to obtaining the law of Sσ with the bending degree. On this basis, an optimal wiring is presented and a physical explanation through the coupling mechanism is given. Finally, an experiment is carried out to further validate the proposed method. |
| Author(s): | D. Ren, W. W. Ruan, P. Xiao, P. A. Du, J. H. Deng, K. M. Zhou |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2072 KB |
| Title: | A Novel PO Solver for Uncertainty EM Computation of Electrically Large Targets |
| Abstract: | A novel PO method is proposed to analyze the uncertain scattering problems. The algorithm starts with modeling the target with a variable shape by using the non-uniform rational B-spline (NURBS) scheme. Then the scattering far-field is expressed in terms of the variable parameters in NURBS. It should be noted that the perturbation approach is applied to describe the uncertainty of the varying shapes. Compared with the traditional Monte Carlo (MC) method, only a few matrix equations are needed to be solved, so the efficiency will increase greatly. At last, several numerical examples are given to validate the accuracy and efficiency of the proposed method. |
| Author(s): | Y. Chen, Z.-G. Hou, H.-C. Yin, R.-S. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1616 KB |
| Title: | Source Enumeration Method Combining Gerschgorin Circle Transform and Generalized Bayesian Information Criterion in Large-scale Antenna Array |
| Abstract: | A new source enumeration method based on gerschgorin circle transform and generalized Bayesian information criterion is devised, for the case that the antenna array observed signals are overlapped with spatial colored noise, and the number of antennas compared with that of snapshots meet the requirement of general asymptotic regime. Firstly, the sample covariance matrix of the observed signals is calculated, and then gerschgorin circle transformation is carried out on the sample covariance matrix. With the help of the more obvious distinction between the transformed signal gerschgorin circle radius and the noise gerschgorin circle radius, the observation statistic used to establish the likelihood function of the information theoretic criterion is constructed, by using the estimated values of the transformed sample covariance matrix’s eigenvalues, and according to the idea of corrected Rao’s score test, the observed statistics used to establish the likelihood function of the ITC are constructed. Based on the statistics, the source number is estimated by employing the generalized Bayesian information criterion (GBIC). The effectiveness of the proposed method is validated by experiments. Compared with the information theoretic criterion (ITC) methods and gerschgorin circle method (GDE), in Gaussian white noise, at the time M/N ≥ 1, that is the relationship between the number of antennas and that of snapshots meets the requirement of the general asymptotic regime, the proposed method can accurately estimate the source number with 100% probability, the other methods failed. Compared with the ITC methods based on eigenvalue diagonal loading and GDE, in colored noise, at the time M/N ≥ 1, the proposed method can accurately estimate the source number with 100% probability, the other methods failed. Compared with the methods based on random matrix theory, in colored noise, the proposed method can estimate the source number with 100% probability, but the estimation of other methods failed. The proposed method has wide applicability, in terms of the relationship between the numbers of antennas and snapshots, it is suitable for both general asymptotic regime and classical asymptotic system, and in terms of noise characteristics, it is suitable for both Gaussian white noise environment and colored noise environment. |
| Author(s): | C. Wang, Y. Zeng, L. Wang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1586 KB |
| 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 |
| Download Link: | Click here to download PDF File Size: 1909 KB |
| 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 |
| Download Link: | Click here to download PDF File Size: 1409 KB |
| Title: | A Broadband Reflectarray Based on Vivaldi Antenna Elements |
| Abstract: | In this paper, a novel broadband reflectarray (RA) is presented. For achieving broadband performance, the unit cell is realized using Vivaldi antenna element, where the feeding line acts as phase delay-line for adjusting the reflection phase. By simply changing the length of phase delay-line, a full 360° phase coverage is obtained. Additionally, the phase response curves are nearly parallel within a broad bandwidth, leading to a wideband operation. To verify this design, a prototype consisting of 10×22 unit cells is designed, fabricated and measured. The measured results show that the maximum gain reaches 21.50 dBi with 20.15% 1-dB gain bandwidth and 30.38% 3-dB gain bandwidth, respectively. Simulated and measured results agree very well with the proposed design scheme. |
| Author(s): | F. Qin, L. Li, Y. Liu, H. Zhang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1572 KB |
| Title: | Low Profile High-gain Antenna for Broadband Indoor Distributed Antenna System |
| Abstract: | Here an improved folded patch antenna with low profile and high gain is proposed. By loading slow-wave metamaterials structure and metal pillars, the antenna operates from 0.6 GHz to 2.1 GHz (111% fractional bandwidth) with the VSWR<2. The profile height is 48.5 mm and 0.095λ at 0.6 GHz. The measured gain is 4 dBi at 0.6 GHz. The average gain is 7.43 dBi over the entire bandwidth. Hence, it is an excellent candidate for the emerging multiband indoor base station application such as 700 MHz, CDMA800, GSM900, DCS1800, PCS1900, UMTS, and IMT2000, etc. |
| Author(s): | L. Xu, Y. J. Zhou |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1647 KB |
| Title: | Multi-Beams Waveguide Slot Antennas at X-Band for Wireless Communications Systems |
| Abstract: | This paper focuses on the design of a multibeams antenna using waveguide slots technology at Xband. The multi-beams radiation is proposed to expand the coverage of the single antenna, thus more capacity is enabled. Waveguide slots antenna is a well-known antenna for high power and gain transmission capabilities. Therefore, it is preferred. In this work, four variations of waveguide slots antennas are studied. The slot distribution covers one to four broad and narrow walls of the waveguide. This technique enables multibeams patterns. The performance of the proposed antennas is simulated using CST microwave software. The simulated responses of the antennas show that a good matched with return loss greater than 10 dB at the desired frequency. The four proposed antennas achieved a good gain between 6.3 and 7.4 dB with directional beamwidth of 15 degree. The proposed antennas are suitable for implementing in radar applications. |
| Author(s): | H. O. Hanoosh, M. K. A. Rahim, N. A. Murad, Y. M. Hussein |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1945 KB |
| Title: | Modified V-Groove Slot Waveguide for DNA Hybridization Detection |
| Abstract: | Highly sensitive slot waveguides are introduced and studied for DNA hybridization detection. In this investigation, two different configurations based on V-groove silicon on insulator (SOI) waveguides are analyzed using full vectorial finite element method. The suggested designs rely on improving the light confinement through the slot region at an operating wavelength of 1.55 μm. The power confinement, power density (PD), and effective index of the supported modes are studied for the conventional rectangular slot waveguide and proposed designs. Further, the effect of adding a plasmonic layer to the reported slot waveguides is implemented. It has been shown that the plasmonic layer increases the light confinement in the slot region with high potential for DNA hybridization detection with good confinement through the slot region. |
| Author(s): | E. ELDamarawy, A. M. Heikal, S. S. A. Obayya, M. F. O. Hameed |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2255 KB |
| Title: | Integrated Simulation and Analysis of Super Large Slotted Waveguide Array |
| Abstract: | Aiming at the simulation problem of the super large slotted waveguide array antenna, the parallel higher-order method of moment is used and the coupling effect between each slot element is taken into account to perform the integrated and accurate simulation. In order to ensure that the algorithm is efficient and stable in the parallel process, the BDPLU strategy is introduced to reduce the communication pressure and eliminates the redundant communication of the equation solving when pivoting, which speeds up the process of matrix equation solving. According to different types of waveguide port forms, the computation of rectangular wave port and coaxial wave port is studied, and a new parallel matrix filling technique of wave port is used to accelerate the matrix filling process. Numerical examples calculated at "Tianhe-2" supercomputer show that the algorithm can efficiently and accurately handle the simulation analysis of most types of complex slotted waveguide array. |
| Author(s): | C. Zhai, Y. Liu, S. Jiang, Z. Lin, X. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1839 KB |
| Title: | Double-layer Chessboard AMC Surface for RCS Reduction in an Ultra-wide Band |
| Abstract: | A novel chessboard surface is proposed for ultra-wideband radar cross section (RCS) reduction. The designed artificial magnetic conductor (AMC) surface is arranged by two different double-layer AMC unit cells, bringing in destructive reflection phase difference (180°±37°) in an ultra-wide band ranging from 5.8 to 16.1 GHz (94.06%). Each double-layer unit cell consists of a substrate layer loaded with metal patches and a PEC layer, in between of which is a 2- mm-thick air gap, which results in smooth phase curves of the two AMC units. One of the metal patches is composed of an octagonal ring and a Union Jack cross, and the other one is a Jerusalem cross. With chessboard arrangement by the two units, the RCS of the proposed surface can be reduced by more than 10 dB over a 90.22% frequency range (6.23-16.47 GHz) for both x and y polarizations. And the 20-dB RCS reduction frequency band ranges from 12.3 GHz to 15.9 GHz (25.5%). Then, the proposed AMC surface is fabricated and measured, and the measured 10-dB RCS reduction frequency band ranges from 6.66 to 16.42 GHz (84.58%) for x polarization and from 6.65 to 16.5 GHz (85.1%) for y polarization, which verifies that the presented AMC configuration may achieve potential applications on low-RCS platforms in an ultra-wide band. |
| Author(s): | X. Song, L. Chen, Z. Yan, Y. Zhang, H. Song |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2196 KB |
| Title: | A Compact Tri-band Miniaturized Antenna with Parasitic Elements Loading |
| Abstract: | A compact tri-band miniaturized antenna with parasitic element loading is proposed for small form factor devices. Firstly, the dual-band antenna is proposed. Based on the theory of characteristic mode (TCM), the resonant of the metal loop decreases by adding three identical square monopole on the other side of the substrate. By exciting one of three square monopoles, the other two monopole treating as parasitic units, can lower the Q factor of the monopole and enhance the bandwidth of the antenna. Then, the tri-band antenna is proposed. By adding metal patches on the side of the parasitic elements, the higher order of the metal loop is excited and the new resonant point is created. With the adoption of the TCM, two degenerate modes are separated by adding metal strips on the metal loop to enhance the bandwidth of the low band. Also, the same way is carried out to decrease the electric size of the antenna and the size of the proposed structure meets the requirement of the electric small antenna. To verify the performance, the proposed antenna is fabricated and tested. The measured results are in agreement with simulated results. |
| Author(s): | Y. Deng, X.-F. Li, J.-S. Hong |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2522 KB |
| Title: | Design of a Printed Metamaterial-Inspired Electrically Small Huygens Source Antenna for Cognitive Radio Applications |
| Abstract: | Metamaterial-inspired electric- and magneticbased near-field resonant parasitic (NFRP) elements are electrically coupled to a coaxial-fed printed monopole to realize an electrically small, ka = 0.49 (λₒ/9.41 x λₒ/14.11 x λₒ/104.18) Huygens source antenna that operates at the GSM1800 frequency. The electric NFRP element is a meander patch; the magnetic element is a Capacitively Loaded Loop (CLL). The individual electric- and magnetic-based antennas were studied numerically to ensure they had overlapping frequency behavior near the GSM frequency 1.8 GHz; high radiation efficiency; and very good matching to their 50 Ω sources. They were combined together and retuned to create a three metal – two dielectric layer Huygens source antenna. A 20 nH inductor was inserted between the driven monopole and the SMA connector in order to enhance the input impedance matching. A prototype of this antenna was fabricated and experimentally characterized. The measurements confirmed the Huygens source nature of the prototype antenna. |
| Author(s): | I. B. Trad, H. Rmili, M. Sheikh, B. Hakim, J.-M. Floch |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 7 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 1499 KB |