ACES Publication Search
There are 18 search results for:
| Title: | ACES Journal May 2020 Cover |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 2197 KB |
| Title: | ACES Journal May 2020 Front/Back Matter |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 7116 KB |
| Title: | ACES Journal May 2020 Full |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Optimization of the Shape of Non-Planar Electronically Scanned Arrays for IFF Applications via Multi-Objective Invasive Weed Optimization Algorithm |
| Abstract: | The identify friend or foe antenna is a complement to many radar antennas which allows the discrimination between friendly and hostile targets by receiving identification data. Such antenna must synthesize both a sum and a difference pattern in azimuth to allow target discrimination and must point to the target being inquired, either by mechanical or electronic scanning in azimuth. In this paper, to attain optimal electronic scanning, an array of antennas lying on a generic planar curve is considered. A multi-objective optimization based on the invasive weed optimization algorithm is then applied to the shape of such curve, aimed at maximizing performances. Whereas a conventional linear array of 6 elements can effectively scan ±30°, with respect to broadside, the proposed array, notwithstanding the same number of elements and overall length, can scan ±45° and still synthesize effective sum and difference patterns. |
| Author(s): | S. Maddio, G. Pelosi, M. Righini, S. Selleri, I. Vecchi |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | RCS Optimization Analysis Method for Sea-Skimming Unmanned Aerial Vehicle Based on Back Propagation Neural Network Algorithm |
| Abstract: | The radar cross section (RCS) of sea-skimming unmanned aerial vehicle (UAV) can be influenced by the sea surface scattering under different sea conditions. In this paper, a composite model of the rough sea surface and sea-skimming UAV is established. A hybrid algorithm based on the application of physical optics (PO) method and improved multilevel fast multipole algorithm (PO-IMLFMA) for solving the RCS of the composite model based on four-path model (FPM) is proposed. Compared with multilevel fast multipole algorithm (IMLFMA) and PO and method of moment (PO-MOM), PO-IMLFMA has the advantages of less memory consumption (about 295 MB) and faster solution speed (about 768 s) for solving the composite model. Furthermore, in view of the influence of sea surface on the RCS of sea-skimming UAV, a compensation scheme based on back propagation (BP) neural network for the RCS of UAV is proposed. The compensation scheme is analyzed for the monostatic RCS of sea-skimming UAV under different sea conditions. The compensation results show that the compensation errors under 1-scale, 3-scale and 5-scale sea conditions are less than 0.95 dBsm, 0.41 dBsm and 1.94 dBsm, respectively. In other words, the compensation scheme significantly reduces the influence of sea condition |
| Author(s): | C. Yang, W. Yan, Y. Zhao, L. Geng, S. Hou, J. Chen |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Design of Low RCS Vivaldi Antenna Based on Differential Evolution Algorithm |
| Abstract: | A novel method to reduce antenna radar cross section (RCS) is proposed in this paper. A wideband Vivaldi antenna is adopted for demonstration, the shape of which is optimized by the differential evolution algorithm (DEA) under Python and HFSS co-simulation environment. By utilizing this simple and efficient design approach, no additional structure is required for RCS reduction while other electromagnetic performance of the antenna can be well maintained. Results show that the designed Vivaldi antenna achieves a good RCS reduction from 4 GHz to 9 GHz, validating the possibility and feasibility of this method for further radar target application. |
| Author(s): | G. Zhao, Z.-Y. Pang, X.-Y. Ma, G.-L. Huang, L. Zhao, J.-J. Liang, C.-Y.-D. Sim |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Research and Experiments on Anti-UAV Technology |
| Abstract: | Unregistered flight of Unmanned Aerial Vehicle (UAV) has been a severe challenge to the security of low-altitude airspace. Illegal elements may use UAV to carry dangerous goods or steal privacy. More and more conferences and large-scale activities pay attention to the security and privacy of the air defense. This paper focuses on two kinds of UAV interference solutions, traditional full-band suppression and targeted spectrum suppression. Experiments show that the target spectrum suppression scheme can reduce 4.61dB transmission power compared with traditional full-band suppression for a certain UAV at the same attack distance. The novelty of paper is that we use artificial intelligence method to analyze the spectrum of UAV signal and the new scheme can reduce power transmission by more than half at the same attack distance. This paper also carry out comparative experiments on different types of UAVs, demonstrating its excellent performance. In addition, for some WiFi UAVs, this paper can even steal their password to acquire the UAVs' control. |
| Author(s): | H. Wei, X. Wang, X. Shi, B. Liang |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Compact Multilayer Dual-mode Substrate Integrated Waveguide Filtering Crossover Based on Orthogonal Modes |
| Abstract: | A novel multilayer substrate integrated waveguide (SIW) filtering crossover is proposed based on the orthogonal degenerate modes in SIW rectangular cavities (SIRCs). The degeneracy of dual-mode in multilayer SIRCs is used to realize the cross transmission and the orthogonality of the two modes is utilized to achieve the isolation relying on the four coupling slots located on metal layers. E-field distributions of the SIW cavities at TE102 and TE201 modes are studied for guiding the circuit realization. And then input/output and isolated ports can share the same resonator, which reduces the number of resonators by two. By adjusting the position of the coupling slots located between layers, the bandwidth can be controlled independently in a certain range without affecting the isolation effect. The detailed analysis and the design method based on coupling matrix have been first introduced to realize a third-order multilayer filtering crossover. Compared with other filtering crossovers, the proposed design exhibits good filtering responses, better isolation, lower loss, as well as compact size. |
| Author(s): | Z. Zhang, Y. Fan |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21794 KB |
| Title: | Design and Application of Coupled Line Cross-Shaped Resonator in Band-pass Filter |
| Abstract: | A coupled line cross-shaped resonator (CLCSR) is proposed, which consists of four parallel coupled lines. By using even- and odd-mode approach, this resonator is characterized and designed to build up a wide band-pass filter. There are three transmission poles in the pass-band and two transmission zeros out of the pass-band. The positions of the transmission zeros are fixed. The transmission poles are determined and adjusted by the parameters: z1, z2, k1, and k2. Then two coupled line cross-shaped resonators are cascaded to realize a wide band-pass filter. The sharper selectivity and better performance can be obtained by cascading two CLCSRs. Good S-parameters are achieved as demonstrated in both simulated and measured results. |
| Author(s): | D.-S. La, X. Guan, H.-C. Li, Y.-Y. Li, J.-W. Guo |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | A Metal-Strip Integrated Filtering Waveguide |
| Abstract: | In this paper, a metal-strip integrated filtering waveguide is proposed. The overall structure consists of a traditional rectangular waveguide and a metal-strip surface which is loaded at the bottom wall of the waveguide. The customized surface can be considered as a meta-surface, the working property of which can be transformed between perfect electric conductor (PEC) and perfect magnetic conductor (PMC) depending on its operational frequency. When the surface acts as a PEC, the filtering waveguide works at pass-band and electromagnetic waves can freely travel inside the waveguide like a conventional one. When the surface plays a role as a PMC outside the interested frequency band, a stop-band can be created where the propagation of electromagnetic waves could be effectively prevented. By integrating the band-pass and band-stop functions into the same waveguide, a compact filtering waveguide structure can be obtained. The proposed filtering waveguide operates in Ku-band with pass-band of 12 GHz~15.1 GHz and stopband of 15.8 GHz~17.4 GHz. Experimental results show a favorable consistency with the simulation results and verify the proposed concept. Moreover, the proposed structure also possesses a compact size and characterizes for easy-fabrication, having a promising practicability in advanced satellite communication system applications. |
| Author(s): | X.-Y Ma, Z.-Y. Pang, G. Zhao, J.-J. Liang, G.-L. Huang, L. Zhao, C.-Y.-D. Sim |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | A 3D Printed Filtering Waveguide with Simple Metamaterial Construction |
| Abstract: | A novel filtering waveguide with bandwidth controllable characteristic is proposed in this work. The filtering waveguide consists of a common rectangular waveguide and metamaterial-based metallic bars. The proposed waveguide is designed for Ku-band application. Inside the operational frequency band, the metallic bars forming a metamaterial surface can behave as perfect electric conductor (PEC), which generates a pass-band for signal transmission, while outside the band of interest, the metallic bars act as perfect magnetic conductor (PMC) and block the transmission of undesired signals, where a stop-band is formed. After integrating the pass-band and stop-band features into the waveguide, a customized waveguide with filtering response is realized. A prototype of the proposed filtering waveguide is fabricated with the advanced metallic 3D printing technique, and experimental results well verify the desired performance. Moreover, the pass-band and stop-band of the filtering waveguide can be flexibly and easily adjusted to meet different requirements with low insertion loss. |
| Author(s): | Z.-Y. Pang, X.-Y Ma, G. Zhao, J.-J. Liang, G.-L. Huang, L. Zhao, C.-Y.-D. Sim |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Three-Stacked Dielectric Ring Resonator Loaded Hybrid Monopole Antenna for Improved Ultrawide Bandwidth |
| Abstract: | In this paper, a new wideband and compact three-segment composite dielectric ring resonator (DRR) antenna excited by an axi-symmetric coaxial monopole has been introduced. The proposed antenna has been investigated numerically and experimentally for enhanced impedance bandwidth. At the lowest operating frequency, the presented antenna has a footprint area of just 0.16λ0 x 0.16λ0. According to the measurement results, the antenna offers a fractional impedance bandwidth equal to 159% with 8dBi peak gain. The antenna provides symmetrical and stable monopole like radiation pattern over the entire impedance bandwidth. With such performance, the suggested antenna can be usefully employed in different wideband applications such as electromagnetic interference (EMI) and defense applications. |
| Author(s): | A. A. Al-Azza, N. A. Malalla, M. M. Morsy, F. J. Harackiewicz |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21794 KB |
| Title: | Design of L-band Energy-Selective Surface with Circular Ring Gap |
| Abstract: | An narrow-band energy-selective surface (ESS) in L-band is presented for airborne GPS antenna protection. Periodic square metal inlaid with circular ring gap is designed and loaded with pin diodes to obtain the energy selection characteristics. the parameters of unit structure are determined with optimization. By simulation, we know that the insertion loss is less than 3dB and the shielding efficiency is more than 30dB. Using the method of equivalent test, we experimentation verified that the proposed ESS structure can be used for airborne GPS antenna protection |
| Author(s): | G. Yang, Y. Li, Q. Wu, Y. Wang, Y. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Wideband MIMO Directional Antenna Array with a Simple Meta-material Decoupling Structure for X-Band Applications |
| Abstract: | In this paper, a compact wideband MIMO directional antenna array with a single-layered meta-material is proposed to realize high isolation. The meta-material decoupling structure, which is composed of a modified split-rings and a square loop structure, is suspended over the two antenna elements to reduce the mutual coupling. The achieved results show that the proposed antenna array owns a −10 dB impedance bandwidth ranging from 8.5 GHz to 11.5 GHz. Furthermore, by loading the proposed meta-material superstrate over the two-element MIMO antenna, the designed MIMO antenna array not only has good performance but also enhances the isolation to be more -15 dB within the operating frequency band. In addition, the performances of the proposed antenna array are also tested by radiation pattern, gain, envelope correlation coefficient, diversity gain, total active reflection coefficient and so on. Therefore, these simulation results prove that the proposed wideband MIMO directional antenna array is a suitable candidate for X-band communication. |
| Author(s): | J. Jiang, Y. Li, L. Zhao, X. Liu |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | A Dual-Polarized Sakura-Shaped Base Station Antenna for 5G Communications |
| Abstract: | In this paper, a dual-polarized sakura-shaped base station antenna for the fifth generation (5G) communication is designed and optimized. The antenna is mainly composed of four parts: main radiator, feed structures, bedframe and reflector. By fabricating and testing of the prototype of the antenna, the results show that the bandwidth (return loss >10dB) of antenna port 1 and port 2 are 9.2% (3.3-3.62GHz) and 16.5% (3.12- 3.68GHz), respectively. In the entire working frequency band, the isolation is greater than 23.5dB. Moreover, the proposed antenna has a stable radiation pattern, and the horizontal half-power beam width (HPBW) and gain of the antenna vary within 65±4° and 5.25-6.31dBi, respectively. The antenna adopts PCB printed structure and has a compact structure 70×70×28mm³. The designed antenna has the advantages of low cost, light weight and good consistency of direction pattern. |
| Author(s): | P. Chen, L. Wang, T. Ding |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Analysis on Crosstalk for Coplanar Irregular-placed Cables Based on Cascading Method and Cubic Spline Interpolation Algorithm |
| Abstract: | The research on cable crosstalk is an important part of electromagnetic compatibility. The conventional research on cable crosstalk is mostly for parallel cables. However, most of the actual transmission line models are in a non-parallel state. A new method for the crosstalk prediction of coplanar irregular-placed cables is proposed in this paper. The method derives the integral form of the transmission line equation based on the cascade method. Combined with the cubic spline interpolation method for the processing of the per unit length parameter matrix, the crosstalk of the coplanar irregular-placed cables is predicted. The orthogonal experiment method is used to find that the distance between transmission lines has the greatest influence on crosstalk, followed by height from the current return plane, frequency, load and length. In order to verify the accuracy of the new method for crosstalk, the full wave method is introduced as a comparison method, and the experiment is introduced as a reference method. The verification results show that the new method has higher accuracy for the crosstalk prediction of coplanar irregular-placed cables, especially in the frequency band less than 100MHz. |
| Author(s): | C. M. Zhu, W. Yan, S. C. Liu, L. Geng |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21794 KB |
| Title: | W-band Electronic Focus-Scanning by a Reconfigurable Transmitarray for Millimeter-Wave Imaging Applications |
| Abstract: | A w-band electronic focus-scanning function, which is desired for high-resolution fast-speed millimeterwave imaging systems, is realized by a reconfigurable transmitarray antenna (RTA). As a two-layer structure, each RTA element is integrated with two packaged PIN diodes symmetrically within a limited area (1.6×1.6mm2). When a linearly polarized electromagnetic wave incidents on this reconfigurable element, an orthogonally polarized transmission wave is generated, with the ability of 1-bit phase adjustment (0°/180°). Using this element, a 32×2 reconfigurable transmitarray is designed and fabricated to realize 1-D steerable focal points in a near-distance focal plane. The measured focal points agree well with the design, illustrating the feasibility of the proposed RTA for w-band microwave imaging systems. |
| Author(s): | X. Pan, F. Yang, S. Xu, M. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21801 KB |
| Title: | Protective Role of Vitamin C in Wi-Fi Induced Oxidative Stress in MC3T3-E1 Cells in Vitro |
| Abstract: | The increasing convenience and benefits provided by wireless technology innovations may also affect the human health because of Wi-Fi electromagnetic radiation. The effects of 2.45 GHz Wi-Fi on oxidative stress (OS) in MC3T3-E1 cells and the protective role of vitamin C are presented and analyzed in this paper. MC3T3-E1 cells were exposed to 100 mW and 500 mW 2.45 GHz Wi-Fi signals at specific absorption rates (SARs) of 0.1671 W/kg and 0.8356 W/kg, referred to as SARa and SARb, respectively, for 0-180 minutes to determine the optimal irradiation time by testing reactive oxygen species (ROS) and glutathione (GSH). Following irradiation for the optimal irradiation time, ROS levels were assayed for 0-120 min after each irradiation. Additional vitamin C is added to the medium to investigate the effect on ROS and GSH. A FDTD simulation showed that the cell layer temperature increased by 0.1°C and 0.5°C after being exposed in the SARa and SARb for the optimal irradiation time (90 min). Ninety min of Wi-Fi irradiation provoked an obvious increment in ROS and GSH on the first day, and the ROS level returned to the initial level 30 min after the irradiation; however, on the third day, it took 90-120 min for ROS to return to baseline. Vitamin C significantly reduced ROS levels and recovery times. In conclusion, 2.45 GHz Wi-Fi radiation triggered oxidative stress in osteoblasts 3cm from the source antenna. Vitamin C effectively reduced the ROS levels stimulated by nonthermal effects of Wi-Fi irradiation. |
| Author(s): | M. Wang, G. Yang, Y. Li, Q. Wu, Y. Li |
| File Type: | Journal Paper |
| Issue: | Volume: 35 Number: 5 Year: 2020 |
| Download Link: | Click here to download PDF File Size: 21794 KB |