Pub Date : 2018-03-01DOI: 10.1109/COMPEM.2018.8496517
Mingjie Pang, Chunbei Luo, Xiaowei Mei, Hai Lin
An efficient shadowing detection method based on octree and an improved specular model for indoor propagation using point cloud data is presented. By partitioning the overall space containing all points into the leaf nodes, an octree can shrink the traverse range dramatically. The theoretical value of the projected Fresnel area is applied to promote the specular model. Numerical results show that the octree has an excellent performance with a high accelerate rate. And The comparisons with ray tracing (RT) and the original method demonstrate that the improved specular model can indeed provide more precise results for indoor propagation. Combined with these two methods, a good simulation result can still be obtained even in a realistic complex indoor environment.
{"title":"Acceleration of Shadowing Detection with Octree and Improved Specular Model for Indoor Propagation Using Point Cloud Data","authors":"Mingjie Pang, Chunbei Luo, Xiaowei Mei, Hai Lin","doi":"10.1109/COMPEM.2018.8496517","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496517","url":null,"abstract":"An efficient shadowing detection method based on octree and an improved specular model for indoor propagation using point cloud data is presented. By partitioning the overall space containing all points into the leaf nodes, an octree can shrink the traverse range dramatically. The theoretical value of the projected Fresnel area is applied to promote the specular model. Numerical results show that the octree has an excellent performance with a high accelerate rate. And The comparisons with ray tracing (RT) and the original method demonstrate that the improved specular model can indeed provide more precise results for indoor propagation. Combined with these two methods, a good simulation result can still be obtained even in a realistic complex indoor environment.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113959073","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496612
Haoran Li, D. Moisseev, A. von Lerber
Dual-polarization radar variables, such as differential reflectivity $(mathrm{Z}_{mathrm{dr}})$, are simulated from observed microphysical property of snowflakes. The increases of particle mass and aspect ratio are found to have opposite effects on $mathrm{Z}_{mathrm{dr}}$, This contradictory effect is different in various riming condition. The results of simulation were adopted to interpret radar observations, which are found to agree with the current hypothesis of riming process.
{"title":"Dual-Polarization Radar Signatures of Rimed Snowflakes","authors":"Haoran Li, D. Moisseev, A. von Lerber","doi":"10.1109/COMPEM.2018.8496612","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496612","url":null,"abstract":"Dual-polarization radar variables, such as differential reflectivity $(mathrm{Z}_{mathrm{dr}})$, are simulated from observed microphysical property of snowflakes. The increases of particle mass and aspect ratio are found to have opposite effects on $mathrm{Z}_{mathrm{dr}}$, This contradictory effect is different in various riming condition. The results of simulation were adopted to interpret radar observations, which are found to agree with the current hypothesis of riming process.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122583637","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496616
Z. Wu, Zhou Cong, Zi He, D. Ding, Rushan Chen
In this paper, a new method based on SBR method is proposed to calculate the electromagnetic scattering problem of electrically large target. In traditional SBR method, the split size is usually less than 0.4 wavelength to ensure the accuracy. In this paper, the split size which could describe the shape of the target is enough. So the calculating memory and time can be reduced greatly. And the parallel technology is utilized to further accelerate the speed of the program.
{"title":"Study on Efficient High Frequency Method of Electromagnetic Scattering of Electrically Large Target","authors":"Z. Wu, Zhou Cong, Zi He, D. Ding, Rushan Chen","doi":"10.1109/COMPEM.2018.8496616","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496616","url":null,"abstract":"In this paper, a new method based on SBR method is proposed to calculate the electromagnetic scattering problem of electrically large target. In traditional SBR method, the split size is usually less than 0.4 wavelength to ensure the accuracy. In this paper, the split size which could describe the shape of the target is enough. So the calculating memory and time can be reduced greatly. And the parallel technology is utilized to further accelerate the speed of the program.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124280135","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496708
M. Huang, Yongzhi Cheng
We present a photo-excited tunable terahertz matematerial absorber (MMA) with polarization-insensitive and wide-angle absorption. The MMA is a periodic array consisted of dielectric layer sandwiched with continue metal film and meander split-rings., where light-sensitive silicon (LSS) chip is embedded in four gaps of split-ring. Since the conductivity of LSS is sensitive for laser light power., the tunable function is easy to achieve for this MMA. The numerical simulations demonstrate that the absorption peak frequency of the designed MMA is varied from O.615THz to O.321THz by modulated LSS. In addition., the relative modulation bandwidth and absorption depth are 62.67% and 49.59%., respectively. Further simulations indicate that the MMA has polarization-insensitive and wide-angle absorption for both TE and TM modes.
{"title":"Design of a Photo-Excited Tunable Metamaterial Absorber with Polarization-Insensitive and Wide-Angle Absorption in Terahertz Regime","authors":"M. Huang, Yongzhi Cheng","doi":"10.1109/COMPEM.2018.8496708","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496708","url":null,"abstract":"We present a photo-excited tunable terahertz matematerial absorber (MMA) with polarization-insensitive and wide-angle absorption. The MMA is a periodic array consisted of dielectric layer sandwiched with continue metal film and meander split-rings., where light-sensitive silicon (LSS) chip is embedded in four gaps of split-ring. Since the conductivity of LSS is sensitive for laser light power., the tunable function is easy to achieve for this MMA. The numerical simulations demonstrate that the absorption peak frequency of the designed MMA is varied from O.615THz to O.321THz by modulated LSS. In addition., the relative modulation bandwidth and absorption depth are 62.67% and 49.59%., respectively. Further simulations indicate that the MMA has polarization-insensitive and wide-angle absorption for both TE and TM modes.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126499210","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496561
Jiong Xu, Dawei Song, D. Ding, S. Tao, Rushan Chcn
The range resolution of the traditional single radar imaging system is limited by the bandwidth of the transmitted signal, while the cross resolution is limited by its observation angle range. In this paper, a high resolution 2d-imaging method using data fusion technique is proposed. First, we introduce the theoretical basis of multi-radar data fusion imaging based on the 2d-radar echo sparse representation model. Then, sparse parameters of multi-radar echo are obtained by ExCoV algorithm. Finally, we get lost echo data by interpolation and extrapolation and realize the fusion process. The simulation results show that the image quality is improved after radar data fusion, which is better than that of the single radar echo, verifying the effectiveness of our method.
{"title":"High Resolution 2d-Imaging Based on Data Fusion Technique","authors":"Jiong Xu, Dawei Song, D. Ding, S. Tao, Rushan Chcn","doi":"10.1109/COMPEM.2018.8496561","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496561","url":null,"abstract":"The range resolution of the traditional single radar imaging system is limited by the bandwidth of the transmitted signal, while the cross resolution is limited by its observation angle range. In this paper, a high resolution 2d-imaging method using data fusion technique is proposed. First, we introduce the theoretical basis of multi-radar data fusion imaging based on the 2d-radar echo sparse representation model. Then, sparse parameters of multi-radar echo are obtained by ExCoV algorithm. Finally, we get lost echo data by interpolation and extrapolation and realize the fusion process. The simulation results show that the image quality is improved after radar data fusion, which is better than that of the single radar echo, verifying the effectiveness of our method.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129248570","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496622
Zhaoyang Qiu, Jun Zhu, Fang Li
The electromagnetic environment is becoming increasingly complex and the non-cooperative radar receiver will intercept the multiple concurrent radar signals. The binary phase shift keying/linear frequency modulated (BPSK/LFM) hybrid modulated signal is a novel kind of low probability of intercept (LPI) signal. In this paper, a new parameter estimation method is proposed for the multiple BPSK/LFM signals. The squaring process and fractional Fourier transform are used to estimate the chirp rate. Then, the output signal to interference plus noise ratio (SINR) is analyzed. Finally, the code rate estimation is given based on the linear transformation. Numerical simulation results show the efficacy of the proposed method and the correctness of the analysis.
{"title":"Multiple BPSK/LFM Hybrid Modulated Signals Parameter Estimation and Analysis Intercepted by Non-Cooperative Radar Receiver","authors":"Zhaoyang Qiu, Jun Zhu, Fang Li","doi":"10.1109/COMPEM.2018.8496622","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496622","url":null,"abstract":"The electromagnetic environment is becoming increasingly complex and the non-cooperative radar receiver will intercept the multiple concurrent radar signals. The binary phase shift keying/linear frequency modulated (BPSK/LFM) hybrid modulated signal is a novel kind of low probability of intercept (LPI) signal. In this paper, a new parameter estimation method is proposed for the multiple BPSK/LFM signals. The squaring process and fractional Fourier transform are used to estimate the chirp rate. Then, the output signal to interference plus noise ratio (SINR) is analyzed. Finally, the code rate estimation is given based on the linear transformation. Numerical simulation results show the efficacy of the proposed method and the correctness of the analysis.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129303963","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496532
F. Xu, Shilei Fu
This paper investigates the potential of using deep neural network (DNN) to model electromagnetic forward problems. As a preliminary attempt, we use a deep convolutional neural network (CNN) to fit the scattered field of an inhomogeneous circular region as calculated by a 2D Finite Element-Boundary Integral (FE-BI) model. This approach provides a new tool to fast map input to output of a specific EM problem, which builds basis for further study on solving inverse problem with DNN.
{"title":"Modeling EM Problem with Deep Neural Networks","authors":"F. Xu, Shilei Fu","doi":"10.1109/COMPEM.2018.8496532","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496532","url":null,"abstract":"This paper investigates the potential of using deep neural network (DNN) to model electromagnetic forward problems. As a preliminary attempt, we use a deep convolutional neural network (CNN) to fit the scattered field of an inhomogeneous circular region as calculated by a 2D Finite Element-Boundary Integral (FE-BI) model. This approach provides a new tool to fast map input to output of a specific EM problem, which builds basis for further study on solving inverse problem with DNN.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128254535","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496601
Meijun Qu, L. Deng, Shuxiang Liu, Shufang Li
In this letter, a novel frequency-independent circular polarized antenna is proposed for satellite communication application. It consists of a slot coupled antenna and a planar metasurface. Four compact sequential L-shaped feeding lines could generate energy to the metasurface through the metallic ground embedded cross slot. Therefore, surface waves could propagate on the metasurface, making the antenna generate additional resonances. Then, wide impedance bandwidth and axial ratio bandwidth of the proposed antenna can be achieved. Besides, the proposed antenna has low profile (0.05 λ0at 3.5 GHz), frequency independent, large front-to-back ratio, high gain, and wide half-power beamwidth property. It has great potential in global satellite communication systems and satellite navigation systems (S band and C band).
{"title":"A Metasurface-Based Slot Coupled Circularly Polarized Antenna for Satellite Communication Application","authors":"Meijun Qu, L. Deng, Shuxiang Liu, Shufang Li","doi":"10.1109/COMPEM.2018.8496601","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496601","url":null,"abstract":"In this letter, a novel frequency-independent circular polarized antenna is proposed for satellite communication application. It consists of a slot coupled antenna and a planar metasurface. Four compact sequential L-shaped feeding lines could generate energy to the metasurface through the metallic ground embedded cross slot. Therefore, surface waves could propagate on the metasurface, making the antenna generate additional resonances. Then, wide impedance bandwidth and axial ratio bandwidth of the proposed antenna can be achieved. Besides, the proposed antenna has low profile (0.05 λ0at 3.5 GHz), frequency independent, large front-to-back ratio, high gain, and wide half-power beamwidth property. It has great potential in global satellite communication systems and satellite navigation systems (S band and C band).","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116444798","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496545
Qun Li, Yonghong Zhang, Lili Qu, Yong Fan
Analytical solutions for characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics are presented. Using the conformal mapping approach, the cross section of coaxial line filled with multilayer dielectrics in z-plane is mapped into cross section of parallel-plate filled with multilayer dielectrics in the t-plane. The capacitance per unit length keeps the same after conformal mapping. The capacitance per unit length is calculated in the t-plane using the classic parallel-plate capacitance calculation equation. Based on the capacitance per unit length, characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics can be derived using transmission line theory. Finally, two examples are given to verify the results. The presented analytical solutions are accurate as well as efficient and are useful for transmission line theory and computer-aided design in microwave engineering.
{"title":"Quasi-Static Analysis of Multilayer Dielectrics Filled Coaxial Line Using Conformal Mapping Method","authors":"Qun Li, Yonghong Zhang, Lili Qu, Yong Fan","doi":"10.1109/COMPEM.2018.8496545","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496545","url":null,"abstract":"Analytical solutions for characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics are presented. Using the conformal mapping approach, the cross section of coaxial line filled with multilayer dielectrics in z-plane is mapped into cross section of parallel-plate filled with multilayer dielectrics in the t-plane. The capacitance per unit length keeps the same after conformal mapping. The capacitance per unit length is calculated in the t-plane using the classic parallel-plate capacitance calculation equation. Based on the capacitance per unit length, characteristic impedance and effective permittivity of coaxial line filled with multilayer dielectrics can be derived using transmission line theory. Finally, two examples are given to verify the results. The presented analytical solutions are accurate as well as efficient and are useful for transmission line theory and computer-aided design in microwave engineering.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116489724","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 : 2018-03-01DOI: 10.1109/COMPEM.2018.8496485
Ruitao Zhou, W. Che, Haidong Chen, W. Feng
A X-band short-pulse high power amplifier (HPA) with high output power and high gain was proposed and implemented in this work. The HPA was realized by cascading a driving amplifier, a high power GaN FET and pulse control circuit. Under the pulse condition of 1 kHz PRF and 1% duty cycle, a maximum pulsed peak power level of 63 W is observed at the frequency of 8.2 GHz. In the frequency band from 8 GHz to 9 GHz, the short-pulsed HP A delivers more than 50W of output power, and the PAE is higher than 24.9%. The gain varies between 41.08 $mathbf{dB}$ and 42.01 dB with less than $pm pmb{1} mathbf{dB}$ gain variation. For demonstration, one prototype was fabricated and measured, reasonable results are observed.
{"title":"A High Power X-Band GaN-Based Short-Pulse Power Amplifier","authors":"Ruitao Zhou, W. Che, Haidong Chen, W. Feng","doi":"10.1109/COMPEM.2018.8496485","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496485","url":null,"abstract":"A X-band short-pulse high power amplifier (HPA) with high output power and high gain was proposed and implemented in this work. The HPA was realized by cascading a driving amplifier, a high power GaN FET and pulse control circuit. Under the pulse condition of 1 kHz PRF and 1% duty cycle, a maximum pulsed peak power level of 63 W is observed at the frequency of 8.2 GHz. In the frequency band from 8 GHz to 9 GHz, the short-pulsed HP A delivers more than 50W of output power, and the PAE is higher than 24.9%. The gain varies between 41.08 $mathbf{dB}$ and 42.01 dB with less than $pm pmb{1} mathbf{dB}$ gain variation. For demonstration, one prototype was fabricated and measured, reasonable results are observed.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127122077","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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