ACES Publication Search
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| Title: | ACES Journal July 2022 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1967 KB |
| Title: | ACES Journal July 2022 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 334 KB |
| Title: | ACES Journal July 2022 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 9059 KB |
| Title: | Metamaterial Loaded Compact Multiband Monopole Antenna for Wireless Applications |
| Abstract: | This paper proposes the design of a compact monopole antenna loaded with metamaterial (MTM), for multiband operation for wireless local area network (WLAN) andWorldwide Interoperability for Microwave Access (WiMAX) applications. The monopole antenna is originally designed to operate in 2.8 GHz and 6 GHz The placement of MTM yields one additional band at 3.5 GHz corresponding to WiMAX with a shift in frequency of the original monopole to the WLAN frequencies of 2.4 GHz and 5.5 GHz with improved matching at the higher band. Dependencies of resonant frequencies on various parameters are formulated through regression analysis and a design equation for the proposed antenna is developed. The full-wave simulation and design equation of the three resonances show a negligible difference. A comparative study of the developed monopole with reported antennas shows that the developed structure is compact with an overall dimension of 19 x 31 mm2. The measured results of the antenna show good impedance bandwidth of 6.25%, 24.57%, and 16.54% for the three bands centered at 2.4, 3.5, and 5.5 GHz The antenna compactness is obtained due to metamaterial loading. All the simulated radiation characteristics of the proposed antenna are validated experimentally. The proposed antenna obtains a compact electrical size of 0.248x0.152 λ02 at 2.4 GHz with multi-band operations at frequencies 2.4 GHz, 3.5 GHz, and 5.5 GHz corresponding to WLAN and WiMAX. |
| Author(s): | S. Thankachan, B. Paul, A. Pradeep, P. Mohanan, R. Moolat |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 2440 KB |
| Title: | Super Ultra-Wideband Planar Antenna with Parasitic Notch and Frequency Selective Surface for Gain Enhancement |
| Abstract: | A compact Super ultra-wideband (SUW) antenna is discussed in this work. A rectangular radiator is modified into a tree-shaped structure with the defected partial ground to enhance the operating bandwidth. The novel rectangular parasitic with the circular slot is used as a notch in the ground plane which prevents the WLAN frequency. The proposed SUW antenna is achieving the 10 dB impedance bandwidth (IBW) from 3.5 GHz to 66.5 GHz frequency with a notched band varying from 5.0 GHz to 5.4 GHz. The bandwidth ratio (BDR) of the proposed SUW antenna is 1773.4 whereas the obtained bandwidth percentage (BW %) is 180. A modified SRR frequency selective surface (FSS) is designed for UWB application to improve the gain of the antenna. The compact unit cell of FSS is having electrical dimensions of 0.16λ0× 0.16λ0. The antenna achieves the maximum realized gain 9.46 dB when FSS is loaded as a superstrate and up to 5.2 dB gain enhancement is observed in the UWB frequency. |
| Author(s): | P. Jha, A. Kumar, A. De, R. K. Jain |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 2093 KB |
| Title: | Spiral Resonator Arrays for Misalignment Compensation in Wireless Power Transfer Systems |
| Abstract: | In this contribution, the authors focus on the use of a metasurface (physically implemented as a 2D array of spiral resonators) as an additional component of a two-coil Wireless Power Transfer (WPT) system, with the aim of increasing the robustness to misalignment between the transmitter and the receiver coils. Resonator arrays have been proven to have a positive effect on WPT systems’ performance since they produce a focusing effect on the magnetic field; at the same time, they contribute to the reduction of the electric near field. In addition, we herein demonstrate how proper control over the metasurface’s unit cells can contribute to making a WPT system more tolerant to misalignment. In particular, the comparison between metasurfaces of different sizes (keeping the same transmitting and receiving coils) and their optimization performed to improve misalignment robustness is proved by numerical simulations. |
| Author(s): | N. Fontana, S. Barmada, M. Raugi, D. Brizi, A. Monorchio |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1977 KB |
| Title: | Preparation and Electrical Testing of Double Top Gate Graphene Field-Effect Transistor |
| Abstract: | In this paper, we prepare and test a graphene field-effect transistor with two top gates. The Fermi energy level of graphene can be adjusted by applying positive and negative voltages to the two top gates, and N-type and P-type graphene are formed in the channel region, thus inducing a graphene p-n junction. The current model is established using the gradual channel approximation (GCA) method, and the current and p-n junction characteristics of the device were obtained by formula simulations. Based on the principle of p-n junction luminescence, this device with graphene p-n junction is expected to achieve terahertz wave radiation with an appropriate optical resonant cavity. |
| Author(s): | J. Huang, Y. Wu, B. Su, J. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1646 KB |
| Title: | Multiple Frequencies Five-Port Reflectometer (FPR) for Pure and Adulterated Honeys |
| Abstract: | Honey adulteration is one of the major health concerns among honey consumers, it is essential to inspect the quality of honey. One of the methods is to characterize the honey by using the microwave reflection technique. A Five-Port Reflectometer (FPR) is proposed in this work. The microstrip Five-Port ring junction circuit was designed for multiple frequencies of 0.60 GHz, 2.28 GHz, and 3.47 GHz. The fabricated circuit works with an analogue-digital converter, open-ended coaxial sensor, diode detectors and computer to form a complete FPR measurement system. The reflection measurements were conducted on Honey Gold and Trigona Honey for multiple frequencies. The performance of the FPR in sparameter measurement was verified by Vector Network Analyzer (VNA). This study shown that the performance of FPR in term of reflection measurement has promising accuracy which is comparable with VNA. The FPR can be used as an alternative instrumentation system for characterizing pure and adulterated honey. |
| Author(s): | E. M. Cheng, A. B. Shahriman, K. Y. Lee, S. F. Khor, N. F. Mohd Nasir, S. A. Baharuddin, C. W. S. Robiah Mohamad, E. Z. Mohd Tarmizi |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1641 KB |
| Title: | Novel Parallelization of Discontinuous Galerkin Method for Transient Electromagnetics Simulation Based on Sunway Supercomputers |
| Abstract: | A novel parallelization of discontinuous Galerkin time-domain (DGTD) method hybrid with the local time step (LTS) method on Sunway supercomputers for electromagnetic simulation is proposed. The proposed method includes a minimum number of roundtrip (MNR) strategy for processor-level parallelism and a double buffer strategy based on the remote memory access (RMA) of the Sunway processor. The MNR strategy optimizes the communication topology between nodes by recursively establishing the minimum spanning tree and the double buffer strategy is designed to make communication overlapped computation when RMA transmission. Combining the two methods, the proposed method achieves an unprecedented massively parallelism of the DGTD method. Several examples of radiation and scattering are used as cases to study the accuracy and validity of the proposed method. The numerical results show that the proposed method can effectively support 16,000 nodes (1,040,000 cores) parallelism on the Sunway supercomputer, which enables the DGTD method to solve the transient electromagnetic field in a very short time. |
| Author(s): | M. Li, Q. Wu, Z. Lin, Y. Zhang, X. Zhao |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1787 KB |
| Title: | Convolutional Neural Network for Coupling Matrix Extraction of Microwave Filters |
| Abstract: | Tuning a microwave filter is a challenging problem due to its complexity. Extracting coupling matrix from given S-parameters is essential for ?lter tuning and design. In this paper, a deep-learning-based neural network namely, a convolutional neural network (CNN) is proposed to extract coupling matrix from Sparameters of microwave filters. The training of the proposed CNN is based on a circuit model. In order to exhibit the robustness of the new technique, it is applied on 5- and 8-pole filters and compared with a shallow neural network namely, radial basis function neural network (RBFNN). The results reveal that the CNN can extract the coupling matrix of target S-parameters with high accuracy and speed. |
| Author(s): | T. Sallam, A. M. Attiya |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 675 KB |
| Title: | Obtaining Feasible Minimum Side Lobe Level for Narrow Beam Width Using Convex Optimization in Linear, Planar, and Random Antenna Arrays |
| Abstract: | In many applications, the radiating elements of the used antenna may be configured in the form of a one-dimensional linear array, or two-dimensional planar array or even random array. In such applications, a simple optimization algorithm is highly needed to optimally determine the excitation amplitudes and phases of the array elements to maximize the system’s performance. This paper uses a convex optimization instead of other complex global stochastic optimizations to synthesize a linear, planar, and random array patterns under prespecified constraint conditions. These constraints could be either fixed beam width with the lowest possible sidelobe levels or fixed sidelobe level with narrower possible beam width. Two approaches for array pattern optimization have been considered. The first one deals with the problem of obtaining a feasible minimum sidelobe level for a given beam width, while the second one tries to obtain a feasible minimum beam width pattern for a given sidelobe level. Both optimization approaches were applied to the linear, planar, and random arrays. Simulation results verified the effectiveness of both optimization approaches and for all considered array configurations. |
| Author(s): | R. R. Shaker, J. R. Mohammed |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 7182 KB |
| Title: | Temperature Effects Analysis on Microwave Rectifiers by Field-Circuit Hybrid Multiphysics Simulation |
| Abstract: | This work analyzes the temperature effects on microwave circuits by employing a novel field-circuit hybrid multiphysics simulation. Firstly, the multiphysics simulation is implemented by solving the coupled governing equations including Poisson equations, semiconductor transport equations, and thermodynamic equations; then, the multiphysics simulation is incorporated into circuit analysis; finally, the circuit simulation results are integrated into the finite-difference timedomain (FDTD) simulation by equivalent sources. In this manner, a field-circuit hybrid multiphysics simulation method is presented. Taking two different microwave rectifiers operating at S- and C-band as examples, temperature effects are analyzed by the proposed approach. Simulation results are in good agreement with measured values, demonstrating the accuracy and applicability of the proposed approach. The presented method more suitably reveals the temperature effects on the rectifier. |
| Author(s): | H. Zeng, Y. Chen, C. Zhou, Y. Tang, X. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 3509 KB |
| Title: | SDR-based Radar for Human Detection |
| Abstract: | Software-defined radios (SDRs) have been applied to several applications, taking advantage of their inherent versatility. It is reported a low-cost radar intended to detect human activity, at the frequency of 4.1 GHz, with an SDR on the receiving branch and a programmable RF synthesizer operating as a continuouswave transmitter. Amplitude variations on the received signal indicate human activity, its operation is tested in indoor and outdoor scenarios. The interface to the SDR is performed using the open-source tool GNU Radio. It was possible to detect human movement at a maximum distance of 9 meters, in an open area. The system is versatile in terms of power and frequency, totally controlled by software in a transparent and straightforward way. |
| Author(s): | M. B. Perotoni, K. M. G. dos Santos, D. B. Almeida, D. Jonathas |
| File Type: | Journal Paper |
| Issue: | Volume: 37 Number: 7 Year: 2022 |
| Download Link: | Click here to download PDF File Size: 1944 KB |