Pub Date : 2018-03-01DOI: 10.1109/COMPEM.2018.8496533
T. Huttunen, P. Monk, V. Shankar, W. Hall
The ultra-weak variational formulation (UWVF) is a Trefftz method for solving time-harmonic wave problems. The combination of flexible meshing and the use of plane wave basis functions makes the UWVF well-suited for solving Maxwell problems in inhomogeneous media and in general geometries that can be tens or even hundreds wavelengths. In a single mesh, the number of basis functions can be adjusted element-wise based on the element size, material properties in the element and the requested level accuracy of the solution. Previous studies have shown that the UWVF method can use from 3 to 130 plane waves per element. In this study, the use of high-dimensional plane waves basis for the UWVF is investigated. The aim is to find a basis which would allow elements with h=/τ ≄ 10 (where h is the length of the longest edge of the element and τ is the wavelength). Three methods for choosing the directions of the plane waves are compared in terms of accuracy of the UWVF approximation and the conditioning of the resulting matrix system. Results suggest that in a simple model problem the goal is achievable but requires over 500 plane wave basis functions per element for a tolerable accuracy.
{"title":"High-Order Ultra-Weak Variational Formulation for Maxwell Equations","authors":"T. Huttunen, P. Monk, V. Shankar, W. Hall","doi":"10.1109/COMPEM.2018.8496533","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496533","url":null,"abstract":"The ultra-weak variational formulation (UWVF) is a Trefftz method for solving time-harmonic wave problems. The combination of flexible meshing and the use of plane wave basis functions makes the UWVF well-suited for solving Maxwell problems in inhomogeneous media and in general geometries that can be tens or even hundreds wavelengths. In a single mesh, the number of basis functions can be adjusted element-wise based on the element size, material properties in the element and the requested level accuracy of the solution. Previous studies have shown that the UWVF method can use from 3 to 130 plane waves per element. In this study, the use of high-dimensional plane waves basis for the UWVF is investigated. The aim is to find a basis which would allow elements with h=/τ ≄ 10 (where h is the length of the longest edge of the element and τ is the wavelength). Three methods for choosing the directions of the plane waves are compared in terms of accuracy of the UWVF approximation and the conditioning of the resulting matrix system. Results suggest that in a simple model problem the goal is achievable but requires over 500 plane wave basis functions per element for a tolerable accuracy.","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":"123648697","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.2018.8496623
B. Steinberg
Using the formulation of electrodynamics in rotating media, we study the effect of rotation on complex interference and diffraction patterns, as observed in the rotating medium's rest-frame. The interference is generated by a set of electrically small scatterers. To observe the rotation footprint, we use Green's function spectral representation in rotating medium and its efficient approximation. Semi-analytic approximations for the rotation-induced pattern distortion are derived. Numerical efficiency of the approximated Green's function usage vs. that of the full spectral representation are briefly discussed.
{"title":"Interference in Rotating Systems","authors":"B. Steinberg","doi":"10.1109/COMPEM.2018.8496623","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496623","url":null,"abstract":"Using the formulation of electrodynamics in rotating media, we study the effect of rotation on complex interference and diffraction patterns, as observed in the rotating medium's rest-frame. The interference is generated by a set of electrically small scatterers. To observe the rotation footprint, we use Green's function spectral representation in rotating medium and its efficient approximation. Semi-analytic approximations for the rotation-induced pattern distortion are derived. Numerical efficiency of the approximated Green's function usage vs. that of the full spectral representation are briefly discussed.","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":"125869547","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.2018.8496706
Chonghua Fang
We first developed a new computing method that can solve the simulation of quantum radar scattering for 3D cylindrical targets. As far as we know so far, it has not been reported. Here we introduced the three-step computation process of orthogonal projected area and verified the method for a typical 2D cylindrical target. Finally, we presented the quantum radar cross section (QRCS) results of a 3D cylinder and compared them with the classical radar cross section.
{"title":"The Simulation of Quantum Radar Scattering for 3D Cylindrical Targets","authors":"Chonghua Fang","doi":"10.1109/COMPEM.2018.8496706","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496706","url":null,"abstract":"We first developed a new computing method that can solve the simulation of quantum radar scattering for 3D cylindrical targets. As far as we know so far, it has not been reported. Here we introduced the three-step computation process of orthogonal projected area and verified the method for a typical 2D cylindrical target. Finally, we presented the quantum radar cross section (QRCS) results of a 3D cylinder and compared them with the classical radar cross section.","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":"124803132","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.2018.8496675
Lizheng Gu, Wanchen Yang, W. Che, Dongxu Chen, Yingqi Zhang, W. Feng
This manuscript proposes a dual-steerable-beam multi-slot coupled metasurface antenna for a potential candidate of the indoor base station application. It consists of $pmb{7times 10}$ metasurface cells coupled by 4 unequal-spacing slots with a two-port microstrip feeding line. The steerable beams are readily obtained by applying some phase differences between adjacent coupling slots. As a result, the operating band of the proposed antenna ranges from 5.15 GHz to 5.35 GHz for applications of LTE-U band in China. The 10-dB beamwidth of the two beams is around 120° in YOZ plane and the cross level at the junction of the two beams is around −10 dB. Compared with conventional multi-beam antenna arrays, the proposed antenna implements two steerable beams without complex beam-forming network or phase shifters, which can be easily extended to multi-beam indoor base station array design.
{"title":"A Dual-Steerable-Beam Multi-Slot Coupled Metasurface Antenna","authors":"Lizheng Gu, Wanchen Yang, W. Che, Dongxu Chen, Yingqi Zhang, W. Feng","doi":"10.1109/COMPEM.2018.8496675","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496675","url":null,"abstract":"This manuscript proposes a dual-steerable-beam multi-slot coupled metasurface antenna for a potential candidate of the indoor base station application. It consists of $pmb{7times 10}$ metasurface cells coupled by 4 unequal-spacing slots with a two-port microstrip feeding line. The steerable beams are readily obtained by applying some phase differences between adjacent coupling slots. As a result, the operating band of the proposed antenna ranges from 5.15 GHz to 5.35 GHz for applications of LTE-U band in China. The 10-dB beamwidth of the two beams is around 120° in YOZ plane and the cross level at the junction of the two beams is around −10 dB. Compared with conventional multi-beam antenna arrays, the proposed antenna implements two steerable beams without complex beam-forming network or phase shifters, which can be easily extended to multi-beam indoor base station array design.","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":"129464734","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.2018.8496523
Bin Wang, Y. Cheng
In this paper, a low-profile wideband 32×32 array antenna is proposed for E-band wireless applications. It covers the frequency band from 69 GHz to 88 GHz. A quadruple-ridge horn is used as the radiating part because of its wideband and low-profile characteristics. Besides, the whole array is fed by a series of E-plane and H-plane parallel-fed power dividers. The total efficiency of the array is about 60% and the peak gain of the array is 38.9 dBi. The array antenna can be fabricated by the diffusion bonding technique. Such an array has a relatively simpler configuration compared with other existing designs, which is able to simplify the design process and shorten the design cycle. Besides, the wider bandwidth of this array can guarantee the fabrication reliability and tolerance, while increasing the production yield.
{"title":"Low-Profile Wideband 32×32 Plate Array Antenna with 24.2% Relative Bandwidth Using Diffusion Bonding Techniques","authors":"Bin Wang, Y. Cheng","doi":"10.1109/COMPEM.2018.8496523","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496523","url":null,"abstract":"In this paper, a low-profile wideband 32×32 array antenna is proposed for E-band wireless applications. It covers the frequency band from 69 GHz to 88 GHz. A quadruple-ridge horn is used as the radiating part because of its wideband and low-profile characteristics. Besides, the whole array is fed by a series of E-plane and H-plane parallel-fed power dividers. The total efficiency of the array is about 60% and the peak gain of the array is 38.9 dBi. The array antenna can be fabricated by the diffusion bonding technique. Such an array has a relatively simpler configuration compared with other existing designs, which is able to simplify the design process and shorten the design cycle. Besides, the wider bandwidth of this array can guarantee the fabrication reliability and tolerance, while increasing the production yield.","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":"128509088","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.2018.8496649
Lijun Guo, Zehao Wang, Lian Shen, Maturi Renuka, B. Zheng, Hongsheng Chen, Huaping Wang
We propose and demonstrate a metasurface hologram for arbitrary image using an active metasurface structure with tunable phase-control unit cells. The phase information of the hologram image is calculated with an adaptive Gerchberg-Saxton algorithm, between the image plane and the diffraction plane, which can be achieved using active phase control metasurface. The phase control of unit cells can be realized by changing electric capacity in series with a pair of subwavelength metallic sticks.
{"title":"Metasurface Holograms with Arbitrary Phase Control of Electromagnetic Wavefront","authors":"Lijun Guo, Zehao Wang, Lian Shen, Maturi Renuka, B. Zheng, Hongsheng Chen, Huaping Wang","doi":"10.1109/COMPEM.2018.8496649","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496649","url":null,"abstract":"We propose and demonstrate a metasurface hologram for arbitrary image using an active metasurface structure with tunable phase-control unit cells. The phase information of the hologram image is calculated with an adaptive Gerchberg-Saxton algorithm, between the image plane and the diffraction plane, which can be achieved using active phase control metasurface. The phase control of unit cells can be realized by changing electric capacity in series with a pair of subwavelength metallic sticks.","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":"128260872","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.2018.8496650
Guang-Yu Zhu, Houxing Zhou, W. Hong
In this paper, the numerical performance of the FIPWA translation operator embedded in the directional multilevel framework is investigated.
本文研究了嵌入在定向多层框架中的FIPWA转换算子的数值性能。
{"title":"FIPWA Translation Operator Embbeded in the Directional Multilevel Framework","authors":"Guang-Yu Zhu, Houxing Zhou, W. Hong","doi":"10.1109/COMPEM.2018.8496650","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496650","url":null,"abstract":"In this paper, the numerical performance of the FIPWA translation operator embedded in the directional multilevel framework is investigated.","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":"127472341","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.2018.8496639
Yanlin Li, T. Shen, T. Wong
Space charge interactions in a semiconducting nanoshell are studied by a transport formulation for carrier dynamics and a quasi-static account for the polarizing electric field in the terahertz frequency range. Numerical results are obtained for the charge density, electric field intensity within and outside the shell and the total induced dipole moment. When the shell thickness is sufficiently large (compared to the screening length of the space charge), the shell behaves like a solid particle at lower frequencies. Above the plasmon resonance, the inertia effect of the charge carriers subdues their ability to respond instantaneously to the applied field so that their screening effect is diminished, giving rise to standing wave buildup in the shell and the electric field reaching the cavity region. Spectral response of the shell, as revealed by the real part of the dipole moment, shows a difference from that of a solid particle, provided that the photon energy is insufficient to activate transition across the energy bandgap of the semiconductor. The action of the nanoshell can be visualized as a high-pass filter in the coupling of a terahertz electric field to its interior cavity.
{"title":"Action of a Semiconducting Nanoshell: From Shielding to Plasma Resonance and Beyond","authors":"Yanlin Li, T. Shen, T. Wong","doi":"10.1109/COMPEM.2018.8496639","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496639","url":null,"abstract":"Space charge interactions in a semiconducting nanoshell are studied by a transport formulation for carrier dynamics and a quasi-static account for the polarizing electric field in the terahertz frequency range. Numerical results are obtained for the charge density, electric field intensity within and outside the shell and the total induced dipole moment. When the shell thickness is sufficiently large (compared to the screening length of the space charge), the shell behaves like a solid particle at lower frequencies. Above the plasmon resonance, the inertia effect of the charge carriers subdues their ability to respond instantaneously to the applied field so that their screening effect is diminished, giving rise to standing wave buildup in the shell and the electric field reaching the cavity region. Spectral response of the shell, as revealed by the real part of the dipole moment, shows a difference from that of a solid particle, provided that the photon energy is insufficient to activate transition across the energy bandgap of the semiconductor. The action of the nanoshell can be visualized as a high-pass filter in the coupling of a terahertz electric field to its interior cavity.","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":"129234255","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.2018.8496657
Tao Shan, Xunwang Dang, Maokun Li, Fan Yang, Shenheng Xu, Ji Wu
In this study, we investigate the feasibility of applying deep learning technique to build a 3D electrostatic solver. A deep convolutional neural network (CNN) is proposed to take advantage of the power of CNN in approximation of highly nonlinear functions and prediction of the potential distribution of electrostatic field. Compared with traditional numerical solvers based on finite difference scheme, this method uses a data-driven end-to-end model. Numerical experiments show that the prediction error can reach below 3 percent and the computing time can be significantly reduced compared with traditional finite difference solvers.
{"title":"Study on a 3D Possion's Equation Slover Based on Deep Learning Technique","authors":"Tao Shan, Xunwang Dang, Maokun Li, Fan Yang, Shenheng Xu, Ji Wu","doi":"10.1109/COMPEM.2018.8496657","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496657","url":null,"abstract":"In this study, we investigate the feasibility of applying deep learning technique to build a 3D electrostatic solver. A deep convolutional neural network (CNN) is proposed to take advantage of the power of CNN in approximation of highly nonlinear functions and prediction of the potential distribution of electrostatic field. Compared with traditional numerical solvers based on finite difference scheme, this method uses a data-driven end-to-end model. Numerical experiments show that the prediction error can reach below 3 percent and the computing time can be significantly reduced compared with traditional finite difference solvers.","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":"125915138","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.2018.8496515
R. Zhao, Jian Feng, Kai-hong Song, Zhixiang Huang, Jun Hu
In this paper, a new multiple-traces Poggio-Miller-Chang-Harrington-Wu-Tsai (MT-PMCHWT) equation is proposed to simulate the electromagnetic scattering from microstrip structures. Different from traditional EFIE-PMCHWT method, in this new multiple-traces method, the original object can be decomposed into two independent domains i.e., the exterior region (free space) and interior region (microstrip), and Robin transmission conditions (TCs) is enforced on the interface between exterior and interior regions to ensure the continuity of fields. In comparison to the traditional EFIE-PMCHWT, this new MT-PMCHWT has a better convergence property. Because the continuity of fields is ensured by TCs, the exterior and interior regions can be discretized by non-conformal meshes, which improves the flexibility and efficiency of the proposed methods substantially.
{"title":"Solving Electromagnetic Scattering from Microstrip Arrays with Multiple-Traces Surface Integral Equations","authors":"R. Zhao, Jian Feng, Kai-hong Song, Zhixiang Huang, Jun Hu","doi":"10.1109/COMPEM.2018.8496515","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496515","url":null,"abstract":"In this paper, a new multiple-traces Poggio-Miller-Chang-Harrington-Wu-Tsai (MT-PMCHWT) equation is proposed to simulate the electromagnetic scattering from microstrip structures. Different from traditional EFIE-PMCHWT method, in this new multiple-traces method, the original object can be decomposed into two independent domains i.e., the exterior region (free space) and interior region (microstrip), and Robin transmission conditions (TCs) is enforced on the interface between exterior and interior regions to ensure the continuity of fields. In comparison to the traditional EFIE-PMCHWT, this new MT-PMCHWT has a better convergence property. Because the continuity of fields is ensured by TCs, the exterior and interior regions can be discretized by non-conformal meshes, which improves the flexibility and efficiency of the proposed methods substantially.","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":"121150685","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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