Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634362
N. Zhang, A. Wu, Yu Mao Wu, Yaqiu Jin
In this work, the fast physical optics (FPO) method is proposed to calculate the scattered fields from the coated scatterers. Different from the plane discretization, the quadratic patches are used to model the surface of the scatterers. Hence the number of the meshes would reduce greatly. With adopting the Lagrange interpolation and the closed-form formulation, the scattered fields could be represented as the analytical formulations. Numerical results demonstrate the accuracy and the efficiency of this method.
{"title":"The Efficient High Frequency Solver for Calculating the Scattered Fields from the Electrically Large Scatterers","authors":"N. Zhang, A. Wu, Yu Mao Wu, Yaqiu Jin","doi":"10.1109/ISAPE.2018.8634362","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634362","url":null,"abstract":"In this work, the fast physical optics (FPO) method is proposed to calculate the scattered fields from the coated scatterers. Different from the plane discretization, the quadratic patches are used to model the surface of the scatterers. Hence the number of the meshes would reduce greatly. With adopting the Lagrange interpolation and the closed-form formulation, the scattered fields could be represented as the analytical formulations. Numerical results demonstrate the accuracy and the efficiency of this method.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125353736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634123
Zhi-peng Li, Jing Ma, Bin Shi, Lin Peng
An ultra-wideband and high gain Fabry-Perot cavity (FPC) antennas is designed using frequency selective surface (FSS) and parasitic microstrip patch. The 3-dB gain bandwidth of the proposed FPC antenna is 19.1% mainly benefits from the FSS with reflection phase increasing with frequency. Moreover, compared with the source antenna the peak gain of the FPC antenna is improved from 8 dBi to 14 dBi. Compared with the normal U-slot antenna the 10-dB impedance bandwidth of the one with three parasitic patches microstrip U-slot antenna is improved from 11.4% to 54.5%. To validate the feasibility of the proposed approach, an FPC antenna prototype has been designed. It consists of a U-slot parasitic microstrip patch antenna as the source, two complementary frequency selective surfaces (FSS) as the partially reflective surface (PRS). Therefore, this new approach can be an effective way to enhance the gain and impedance bandwidth without increasing the cavity profile or using multi-layer superstrate structures.
{"title":"Ultra-Wideband and High Gain Fabry-Perot Cavity Antenna Using Frequency Selective Surface and Parasitic Patch","authors":"Zhi-peng Li, Jing Ma, Bin Shi, Lin Peng","doi":"10.1109/ISAPE.2018.8634123","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634123","url":null,"abstract":"An ultra-wideband and high gain Fabry-Perot cavity (FPC) antennas is designed using frequency selective surface (FSS) and parasitic microstrip patch. The 3-dB gain bandwidth of the proposed FPC antenna is 19.1% mainly benefits from the FSS with reflection phase increasing with frequency. Moreover, compared with the source antenna the peak gain of the FPC antenna is improved from 8 dBi to 14 dBi. Compared with the normal U-slot antenna the 10-dB impedance bandwidth of the one with three parasitic patches microstrip U-slot antenna is improved from 11.4% to 54.5%. To validate the feasibility of the proposed approach, an FPC antenna prototype has been designed. It consists of a U-slot parasitic microstrip patch antenna as the source, two complementary frequency selective surfaces (FSS) as the partially reflective surface (PRS). Therefore, this new approach can be an effective way to enhance the gain and impedance bandwidth without increasing the cavity profile or using multi-layer superstrate structures.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134234064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634227
Shengwen Liu, B. Du, Yang Wu, Guoxi Liu, Zeyu Meng, Yunhe Bai
In this paper, a brief review of the SKA dish prototype (SKA-P) included the optical and structural design is presented, and its structural and electrical performance is analyzed and measured. The results satisfy the SKA requirements.
{"title":"Performance Analysis of SKA Dish Prototype","authors":"Shengwen Liu, B. Du, Yang Wu, Guoxi Liu, Zeyu Meng, Yunhe Bai","doi":"10.1109/ISAPE.2018.8634227","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634227","url":null,"abstract":"In this paper, a brief review of the SKA dish prototype (SKA-P) included the optical and structural design is presented, and its structural and electrical performance is analyzed and measured. The results satisfy the SKA requirements.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131810153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634060
Lin Yao, Yuanjian Liu, Shuangde Li
In this paper, a $4times 4$ indoor MIMO (Multiple-Input and Multiple-Output) system is simulated based on the SBR (Shooting and Bouncing Ray) method. In order to estimate the performance of MIMO system, the impacts of antenna polarization and signal frequency on propagation characteristics such as path loss, capacity, throughput are studied in both line-of-sight and non-line-of-sight link.
本文基于SBR (Shooting and bounce Ray)方法，对一个$4 × 4$室内多输入多输出(MIMO)系统进行了仿真。为了评估MIMO系统的性能，研究了天线极化和信号频率对视距和非视距链路中路径损耗、容量、吞吐量等传播特性的影响。
{"title":"Simulation of Indoor MIMO Channel Propagation Characteristics Based on the SBR Method","authors":"Lin Yao, Yuanjian Liu, Shuangde Li","doi":"10.1109/ISAPE.2018.8634060","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634060","url":null,"abstract":"In this paper, a $4times 4$ indoor MIMO (Multiple-Input and Multiple-Output) system is simulated based on the SBR (Shooting and Bouncing Ray) method. In order to estimate the performance of MIMO system, the impacts of antenna polarization and signal frequency on propagation characteristics such as path loss, capacity, throughput are studied in both line-of-sight and non-line-of-sight link.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134337962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634075
Wenwen Qin, Jian Dong, M. Wang, Yingjuan Li, Shan Wang
Aiming at reducing the large computation cost of traditional EM-driven antenna design methods, surrogate models based on back propagation neural networks (BPNN) are studied. In order to solve the problem of easily falling into local optimum in BPNN, a PSO-BPNN surrogate model is developed by improving initial structural parameters of neural networks and applied to fast multi-objective optimization design of multi-parameter antenna structures. Design results show that the proposed PSO-BPNN surrogate model can be integrating into multi-objective evolutionary algorithms for dealing with complex antenna designs with high-dimensional parameter space.
{"title":"Fast Antenna Design Using Multi-Objective Evolutionary Algorithms and Artificial Neural Networks","authors":"Wenwen Qin, Jian Dong, M. Wang, Yingjuan Li, Shan Wang","doi":"10.1109/ISAPE.2018.8634075","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634075","url":null,"abstract":"Aiming at reducing the large computation cost of traditional EM-driven antenna design methods, surrogate models based on back propagation neural networks (BPNN) are studied. In order to solve the problem of easily falling into local optimum in BPNN, a PSO-BPNN surrogate model is developed by improving initial structural parameters of neural networks and applied to fast multi-objective optimization design of multi-parameter antenna structures. Design results show that the proposed PSO-BPNN surrogate model can be integrating into multi-objective evolutionary algorithms for dealing with complex antenna designs with high-dimensional parameter space.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134436589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634268
Yunzhou Zhu, Zhongxin Deng, T. Xu
The statistical characteristics of mid-low latitude ionospheric E-region field-aligned irregularities (FAI) observed with the Kunming very high-frequency (VHF) radar are presented. First, the observational results show that the irregularities appeared mainly in periods before noon and near night, with the nighttime echoes being more intense and covering a greater height extent than that during the daytime. Second, we observed the existence of two well-defined types of echoes in the nighttime: the lower E-region echoes (115-130km) and upper E-region echoes (130-150km). Moreover, there are differences in FAI's motion characteristics at different range in the daytime and nighttime. Without in-field measurements, it is difficult to verify what physical mechanisms may explain the formation of the irregularities, which we will combine other facilities to analyze it in the future.
{"title":"Investigations of Ionospheric E-region Field-aligned Irregularities Observed with Kunming VHF Radar","authors":"Yunzhou Zhu, Zhongxin Deng, T. Xu","doi":"10.1109/ISAPE.2018.8634268","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634268","url":null,"abstract":"The statistical characteristics of mid-low latitude ionospheric E-region field-aligned irregularities (FAI) observed with the Kunming very high-frequency (VHF) radar are presented. First, the observational results show that the irregularities appeared mainly in periods before noon and near night, with the nighttime echoes being more intense and covering a greater height extent than that during the daytime. Second, we observed the existence of two well-defined types of echoes in the nighttime: the lower E-region echoes (115-130km) and upper E-region echoes (130-150km). Moreover, there are differences in FAI's motion characteristics at different range in the daytime and nighttime. Without in-field measurements, it is difficult to verify what physical mechanisms may explain the formation of the irregularities, which we will combine other facilities to analyze it in the future.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132426529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634324
Xiong-jie Jin, Shuoguang Wang, You-wei Liu
This paper presents a new type of wide-bandwidth beam antenna, which uses a relatively new type of cross-type microstrip dipole. This form has a wider −3dB beamwidth than ordinary microstrip antennas. The radiation profile uses a gradation profile and widens the bandwidth of the antenna by adding parasitic structures and increasing the air frame height. Antenna structure parameters are optimized using ANSYS HFSS. What the test results display is that the 1 port and 2 port standing wave's relative bandwidth <−7.5dB of designed antenna unit reach 35.9% and 22.8%, the central frequency E-plane and H-plane beam width are 110 ° and 91 °, respectively, which facilitates large-angle scanning. This antenna is an orthogonal two-line polarized antenna with a zenith-directional line polarization cross-polarization level of −19.55 dB. With the help of software Matlab, we use sparse Focuss algorithm obtain the antenna array composed of 64 units. The gain reaches 19.61dB when the scanning angle is 60°. It was verified that this antenna element and sparse array have good characteristics.
{"title":"Broadband Wide Beam Dual Polarization Antenna Unit and Its Sparse Array","authors":"Xiong-jie Jin, Shuoguang Wang, You-wei Liu","doi":"10.1109/ISAPE.2018.8634324","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634324","url":null,"abstract":"This paper presents a new type of wide-bandwidth beam antenna, which uses a relatively new type of cross-type microstrip dipole. This form has a wider −3dB beamwidth than ordinary microstrip antennas. The radiation profile uses a gradation profile and widens the bandwidth of the antenna by adding parasitic structures and increasing the air frame height. Antenna structure parameters are optimized using ANSYS HFSS. What the test results display is that the 1 port and 2 port standing wave's relative bandwidth <−7.5dB of designed antenna unit reach 35.9% and 22.8%, the central frequency E-plane and H-plane beam width are 110 ° and 91 °, respectively, which facilitates large-angle scanning. This antenna is an orthogonal two-line polarized antenna with a zenith-directional line polarization cross-polarization level of −19.55 dB. With the help of software Matlab, we use sparse Focuss algorithm obtain the antenna array composed of 64 units. The gain reaches 19.61dB when the scanning angle is 60°. It was verified that this antenna element and sparse array have good characteristics.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132453754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634373
Fengli Xue, F. Xu
The scattering of a 3-D deterministic forest scene is calculated for simulating the synthetic aperture radar(SAR) image. The generated trees are simplified as a cluster of slim cylinders and disks with the deterministic location, orientation and dielectric constant, which are used for coherent scattering calculation. To ensure the accuracy of coherent scattering calculation, the validity of the generalized Rayleigh-Gans (GRG) approximation and the infinite cylinder approximation are verified. The scattering of tree's components is verified by comparing the imaging results of the calculated data and the simulated data.
{"title":"Scattering verification and imaging of vegetation and its components","authors":"Fengli Xue, F. Xu","doi":"10.1109/ISAPE.2018.8634373","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634373","url":null,"abstract":"The scattering of a 3-D deterministic forest scene is calculated for simulating the synthetic aperture radar(SAR) image. The generated trees are simplified as a cluster of slim cylinders and disks with the deterministic location, orientation and dielectric constant, which are used for coherent scattering calculation. To ensure the accuracy of coherent scattering calculation, the validity of the generalized Rayleigh-Gans (GRG) approximation and the infinite cylinder approximation are verified. The scattering of tree's components is verified by comparing the imaging results of the calculated data and the simulated data.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132598768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634293
Lei Wang, Wenxiao Fang, Y. En, Yun Huang, Weiheng Shao, Bin Yao
This letter presents a new broadband circularly polarized (CP) monopole antenna with modified ground. The proposed antenna fed by coaxial probe consists of a square ground loaded with an L-shaped branch, which is capable of generating broadband CP radiation. In addition, an I-shaped slit is embedded into the ground plane to improve the impedance matching. The presented antenna has a 10 dB return loss bandwidth from 1.82 to 4.21 GHz (79.3% centered at 3.02 GHz), and a wide 3 dB axial-ratio (AR) bandwidth from 1.84 to 3.95 GHz (72.9% centered at 2.89 GHz). The measured gains are greater than 2.0 dBic in the AR band, and the gain variation within the AR band is less than 1 dBic, which means a good flat gain feature in the broad frequency band. Both the simulated and measured results validate the proposed design.
{"title":"A New Broadband Circularly Polarized Monopole Antenna With Modified Ground","authors":"Lei Wang, Wenxiao Fang, Y. En, Yun Huang, Weiheng Shao, Bin Yao","doi":"10.1109/ISAPE.2018.8634293","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634293","url":null,"abstract":"This letter presents a new broadband circularly polarized (CP) monopole antenna with modified ground. The proposed antenna fed by coaxial probe consists of a square ground loaded with an L-shaped branch, which is capable of generating broadband CP radiation. In addition, an I-shaped slit is embedded into the ground plane to improve the impedance matching. The presented antenna has a 10 dB return loss bandwidth from 1.82 to 4.21 GHz (79.3% centered at 3.02 GHz), and a wide 3 dB axial-ratio (AR) bandwidth from 1.84 to 3.95 GHz (72.9% centered at 2.89 GHz). The measured gains are greater than 2.0 dBic in the AR band, and the gain variation within the AR band is less than 1 dBic, which means a good flat gain feature in the broad frequency band. Both the simulated and measured results validate the proposed design.","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132622119","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-12-01DOI: 10.1109/ISAPE.2018.8634341
Zi-Jian Han, Wei Song, Yulong Zhu, X. Sheng
A novel low profile EBG is proposed to reduce the radar cross section (RCS) and enhance the gain for patch antenna. The proposed antenna shows low scattering performance for both x- and y-polarization at boresight. Different with conventional low RCS reflector designed by using chessboard-like structure, this design makes use of one-dimensional (1-D) periodic metasurface and need fewer metamaterial cells. Full wave simulation results show that RCS can be reduced more than 13dB at 11.2GHz by the proposed slotted EBG. Except for the RCS reduction, the broadside gain can be obviously enhanced over the antenna operating frequency bandwidth from 10.55GHz to 12GHz (12.9%).
{"title":"RCS Reduction and Gain Enhancement for Patch Antenna by Using Low Profile EBG","authors":"Zi-Jian Han, Wei Song, Yulong Zhu, X. Sheng","doi":"10.1109/ISAPE.2018.8634341","DOIUrl":"https://doi.org/10.1109/ISAPE.2018.8634341","url":null,"abstract":"A novel low profile EBG is proposed to reduce the radar cross section (RCS) and enhance the gain for patch antenna. The proposed antenna shows low scattering performance for both x- and y-polarization at boresight. Different with conventional low RCS reflector designed by using chessboard-like structure, this design makes use of one-dimensional (1-D) periodic metasurface and need fewer metamaterial cells. Full wave simulation results show that RCS can be reduced more than 13dB at 11.2GHz by the proposed slotted EBG. Except for the RCS reduction, the broadside gain can be obviously enhanced over the antenna operating frequency bandwidth from 10.55GHz to 12GHz (12.9%).","PeriodicalId":297368,"journal":{"name":"2018 12th International Symposium on Antennas, Propagation and EM Theory (ISAPE)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133527605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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