Pub Date : 2018-10-17DOI: 10.1109/COMPEM.2018.8496508
M. Tang, Yang Wang, Ying Chen, R. Ziolkowski
Two planar efficient wideband, electrically small monopole filtennas are presented. The first one directly evolves from a common planar capacitively loaded loop (CLL)-based filter possessing a flat realized gain response within the operational band and good band-edge selectivity. The second filtenna consists of a driven element augmented with a CLL structure and with slots etched into its ground plane. It expands the fractional impedance bandwidth of the first case from 6.28 percent up to 7.9 percent. It also has a gain response that remains flat over its operational bandwidth and even higher band-edge selectivity. Both filtennas are electrically small with ka less than 1. The experimental results, which are in good agreement with their simulated values, demonstrate that both filtennas exhibit excellent impedance matching, high radiation efficiency, flat gain response, and steep skirts at both band edges. Moreover, they produce monopole radiation patterns that are uniform and nearly omnidirectional in their H-planes.
{"title":"Designs of Compact, Planar, Wideband, Monopole Filtennas with Near-Field Resonant Parasitic Elements","authors":"M. Tang, Yang Wang, Ying Chen, R. Ziolkowski","doi":"10.1109/COMPEM.2018.8496508","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496508","url":null,"abstract":"Two planar efficient wideband, electrically small monopole filtennas are presented. The first one directly evolves from a common planar capacitively loaded loop (CLL)-based filter possessing a flat realized gain response within the operational band and good band-edge selectivity. The second filtenna consists of a driven element augmented with a CLL structure and with slots etched into its ground plane. It expands the fractional impedance bandwidth of the first case from 6.28 percent up to 7.9 percent. It also has a gain response that remains flat over its operational bandwidth and even higher band-edge selectivity. Both filtennas are electrically small with ka less than 1. The experimental results, which are in good agreement with their simulated values, demonstrate that both filtennas exhibit excellent impedance matching, high radiation efficiency, flat gain response, and steep skirts at both band edges. Moreover, they produce monopole radiation patterns that are uniform and nearly omnidirectional in their H-planes.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114150103","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 : 2018-10-17DOI: 10.1109/COMPEM.2018.8496619
Ting Zhang, Jiaqing Yin, Zongqi Cai, Yang Yang, J. Bao
In this paper, a compact X-band low phase noise oscillator based on a hybrid SIW cavity resonator is presented. This proposed resonator is composed of a circular waveguide cascaded by two rectangular waveguides. Two pairs of holes are embedded into the resonator to improve the Q-factor. Owing to the existence of discontinuous metal side walls, the fundamental mode $mathbf{TM}_{110}$ of the circular waveguide can be applied to design the oscillation frequency of the oscillator. The fabricated oscillator has been demonstrated to oscillate at 9.5 GHz. The phase noise is less than −112.84 dBc/Hz at 100 kHz offset with 1.67 dBm output power, exhibiting the figure of merit (FOM) of −202.06 dBc/Hz.
{"title":"X-Band Low Phase Noise Oscillator Based on Hybrid SIW Cavity Resonator","authors":"Ting Zhang, Jiaqing Yin, Zongqi Cai, Yang Yang, J. Bao","doi":"10.1109/COMPEM.2018.8496619","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496619","url":null,"abstract":"In this paper, a compact X-band low phase noise oscillator based on a hybrid SIW cavity resonator is presented. This proposed resonator is composed of a circular waveguide cascaded by two rectangular waveguides. Two pairs of holes are embedded into the resonator to improve the Q-factor. Owing to the existence of discontinuous metal side walls, the fundamental mode $mathbf{TM}_{110}$ of the circular waveguide can be applied to design the oscillation frequency of the oscillator. The fabricated oscillator has been demonstrated to oscillate at 9.5 GHz. The phase noise is less than −112.84 dBc/Hz at 100 kHz offset with 1.67 dBm output power, exhibiting the figure of merit (FOM) of −202.06 dBc/Hz.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132892183","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 : 2018-10-17DOI: 10.1109/COMPEM.2018.8496527
Mengze Lil, Jing-Yu Lin, Yang Yang, Xi Zhu, Sai‐Wai Wong
This paper presents a recently proposed novel approach for pattern reconfigurable antenna designs. Individually associating a shorting post with an RF switch, the shorting post can be simply connected to the ground by turning the switch on or disconnected to the ground by turning the switch off. This approach has been successfully validated through two recently reported designs, for the implementations of transverse magnetic TM mode reconfiguration and 360° beam-steering.
{"title":"A New Approach of Individually Control of Shorting Posts for Pattern Reconfigurable Antenna Designs","authors":"Mengze Lil, Jing-Yu Lin, Yang Yang, Xi Zhu, Sai‐Wai Wong","doi":"10.1109/COMPEM.2018.8496527","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496527","url":null,"abstract":"This paper presents a recently proposed novel approach for pattern reconfigurable antenna designs. Individually associating a shorting post with an RF switch, the shorting post can be simply connected to the ground by turning the switch on or disconnected to the ground by turning the switch off. This approach has been successfully validated through two recently reported designs, for the implementations of transverse magnetic TM mode reconfiguration and 360° beam-steering.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132051400","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 : 2018-10-17DOI: 10.1109/COMPEM.2018.8496457
J. Lai, M. O’Neil
Axis-symmetric objects are an important class of shapes that appear in many electromagnetic applications. By using the separation of variables, we are able to derive a fast and high order numerical algorithm that solves the 3D electromagnetic scattering for an arbitrary axis-symmetric object. The main novelty here is to combine the fast recursion formula for the kernel evaluation along the revolution curve and high order generalized Gaussian quadrature for the singular integrals in integral equations. Numerical experiments show that for a modest sized cylinder, we can easily obtain more than 6 digits accuracy in less than 90 seconds on a personal laptop.
{"title":"A Fast and High Order Algorithm for the Electromagnetic Scattering of Axis-Symmetric Objects","authors":"J. Lai, M. O’Neil","doi":"10.1109/COMPEM.2018.8496457","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496457","url":null,"abstract":"Axis-symmetric objects are an important class of shapes that appear in many electromagnetic applications. By using the separation of variables, we are able to derive a fast and high order numerical algorithm that solves the 3D electromagnetic scattering for an arbitrary axis-symmetric object. The main novelty here is to combine the fast recursion formula for the kernel evaluation along the revolution curve and high order generalized Gaussian quadrature for the singular integrals in integral equations. Numerical experiments show that for a modest sized cylinder, we can easily obtain more than 6 digits accuracy in less than 90 seconds on a personal laptop.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131871188","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 : 2018-06-01DOI: 10.1109/COMPEM.2018.8496537
Jing Yang, Wei Lin, H. Wong
This paper gives an review of innovative wideband CP polarization and pattern reconfigurable antennas. First, two wideband CP reconfigurable antennas with the broadside radiation patterns are presented. One design was realized by four sequentially-rotated monopoles with an output reconfigurable feed network. Another design adopted L-probes fed square patch that reduced the profile to 0.1 λ0. Second, rather than producing the broadside radiation pattern, a wideband CP reconfigurable wheel-shaped antenna with the conical-beam pattern is introduced, which is intended for geostationary satellite applications. Third, in addition to the polarization reconfigurability, a wideband CP antenna with switchable broadside and conical-beam patterns is presented, which excites both TMn and $mathbf{TM}_{21}$ modes on an annular slotted circular patch radiator. All the above CP polarization and pattern reconfigurable antennas are attractive for the emerging wireless communication systems, especially the satellite communication systems.
{"title":"Wideband CP Polarization and Pattern Reconfigurable Antennas","authors":"Jing Yang, Wei Lin, H. Wong","doi":"10.1109/COMPEM.2018.8496537","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496537","url":null,"abstract":"This paper gives an review of innovative wideband CP polarization and pattern reconfigurable antennas. First, two wideband CP reconfigurable antennas with the broadside radiation patterns are presented. One design was realized by four sequentially-rotated monopoles with an output reconfigurable feed network. Another design adopted L-probes fed square patch that reduced the profile to 0.1 λ0. Second, rather than producing the broadside radiation pattern, a wideband CP reconfigurable wheel-shaped antenna with the conical-beam pattern is introduced, which is intended for geostationary satellite applications. Third, in addition to the polarization reconfigurability, a wideband CP antenna with switchable broadside and conical-beam patterns is presented, which excites both TMn and $mathbf{TM}_{21}$ modes on an annular slotted circular patch radiator. All the above CP polarization and pattern reconfigurable antennas are attractive for the emerging wireless communication systems, especially the satellite communication systems.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130395379","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 : 2018-03-26DOI: 10.1109/COMPEM.2018.8496505
Yong-Qiang Liu, Liangsheng Li, Hongcheng Yin
Graphene surface plasmon polaritons (SPP) provide a promising platform to develop a series of new photonic, plasmonic and optoelectronic devices from terahertz to optic spectrum owing to its excellent properties. In this paper, a new kind of graphene metasurfaces, i.e., bilayer graphene ribbon arrays separated by a dielectric gap is proposed. The general dispersion theory of SPP mode on the structure is investigated by a modal expansion method. Solving field expressions on different regions and using proper periodic boundary conditions, the analytical dispersion expressions of SPP mode are obtained on the bilayer graphene ribbon arrays for the first time. With this result, the SPP characteristics of dispersion and propagation loss can be calculated and analyzed with graphene and structural parameters. The proposed SPP modes on the bilayer graphene ribbon arrays metasurface can open up new ways to develop some functional devices such as low-loss sub-wavelength plasmonic waveguide, planar retroreflectors and the enhanced terahertz radiation source.
{"title":"Studies on Surface Plasmon Dispersion Theory on the Bilayer Graphene Ribbon Arrays Metasurface","authors":"Yong-Qiang Liu, Liangsheng Li, Hongcheng Yin","doi":"10.1109/COMPEM.2018.8496505","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496505","url":null,"abstract":"Graphene surface plasmon polaritons (SPP) provide a promising platform to develop a series of new photonic, plasmonic and optoelectronic devices from terahertz to optic spectrum owing to its excellent properties. In this paper, a new kind of graphene metasurfaces, i.e., bilayer graphene ribbon arrays separated by a dielectric gap is proposed. The general dispersion theory of SPP mode on the structure is investigated by a modal expansion method. Solving field expressions on different regions and using proper periodic boundary conditions, the analytical dispersion expressions of SPP mode are obtained on the bilayer graphene ribbon arrays for the first time. With this result, the SPP characteristics of dispersion and propagation loss can be calculated and analyzed with graphene and structural parameters. The proposed SPP modes on the bilayer graphene ribbon arrays metasurface can open up new ways to develop some functional devices such as low-loss sub-wavelength plasmonic waveguide, planar retroreflectors and the enhanced terahertz radiation source.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125340194","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 : 2018-03-26DOI: 10.1109/COMPEM.2018.8496632
Longgang Wang, Min Wang, Wei Zhong, Lianlin Li
Electromagnetic inverse scattering problem is a typical complex problem while traditional deep convolutional neural network can only be applied to real problem. Motivated by this, this paper presents a new approach for electromagnetic inverse problem with complex convolutional neural network. In this way, several cascaded convolutional neural network modules are introduced to learn a model to realize super-resolution for electromagnetic imaging. The simulation and experimental results show that the proposed method paves a new way addressing realtime practical large-scale electromagnetic inverse scattering problems.
{"title":"Complex-Valued Deep Convolutional Networks for Nonlinear Electromagnetic Inverse Scattering","authors":"Longgang Wang, Min Wang, Wei Zhong, Lianlin Li","doi":"10.1109/COMPEM.2018.8496632","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496632","url":null,"abstract":"Electromagnetic inverse scattering problem is a typical complex problem while traditional deep convolutional neural network can only be applied to real problem. Motivated by this, this paper presents a new approach for electromagnetic inverse problem with complex convolutional neural network. In this way, several cascaded convolutional neural network modules are introduced to learn a model to realize super-resolution for electromagnetic imaging. The simulation and experimental results show that the proposed method paves a new way addressing realtime practical large-scale electromagnetic inverse scattering problems.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122671017","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 : 2018-03-26DOI: 10.1109/COMPEM.2018.8496553
Hao Wang, Li Xu, Bin Li, S. Descombes, Stéphane Lanteril
In this work, an interior penalty discontinuous galerkin time domain method is developed for the discretization of the 3D time-domain Maxwell's equations coupled to a Drude dispersion model for nanophotonic applications. High order hierarchical vector basis and high order explicit Low-Storage Runge-Kutta scheme is applied for the space and time discretization, respectively. Numerical experiment is implemented to demonstrate the accuracy of the proposed method.
{"title":"An Interior Penalty Discontinuous Galerkin Time Domain Method for Nanophotonic Applications","authors":"Hao Wang, Li Xu, Bin Li, S. Descombes, Stéphane Lanteril","doi":"10.1109/COMPEM.2018.8496553","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496553","url":null,"abstract":"In this work, an interior penalty discontinuous galerkin time domain method is developed for the discretization of the 3D time-domain Maxwell's equations coupled to a Drude dispersion model for nanophotonic applications. High order hierarchical vector basis and high order explicit Low-Storage Runge-Kutta scheme is applied for the space and time discretization, respectively. Numerical experiment is implemented to demonstrate the accuracy of the proposed method.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127591917","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 : 2018-03-26DOI: 10.1109/COMPEM.2018.8496494
Xiong Yang, Y. S. Cao, Xu Wang, Ling Zhang, Lijun Jiang, Shiquan He, Huapeng Zhao, Jun Hu, J. Fan, J. Drewniak
Unintential radiation caused by EMI (electromag-netic interference) trouble-makers has always been a vital issue to deal with. Among them, the radiation from heatsinks is a tough problem. In this paper, a characteristic mode (CM) method is proposed to identify the radiation hot spots for heatsink, and to explain the radiation phtsics. With the proposed method, by applying integral-equation (IE) based method and characteristic mode analysis, the radiation modal from each part of the structure can be quantified using the current. Therefore, the radiation hot spot can be identified. This method facilitates the CM method in real applications.
{"title":"Characterizing Radiation Physics and EMI Mitigation for Heatsinks","authors":"Xiong Yang, Y. S. Cao, Xu Wang, Ling Zhang, Lijun Jiang, Shiquan He, Huapeng Zhao, Jun Hu, J. Fan, J. Drewniak","doi":"10.1109/COMPEM.2018.8496494","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496494","url":null,"abstract":"Unintential radiation caused by EMI (electromag-netic interference) trouble-makers has always been a vital issue to deal with. Among them, the radiation from heatsinks is a tough problem. In this paper, a characteristic mode (CM) method is proposed to identify the radiation hot spots for heatsink, and to explain the radiation phtsics. With the proposed method, by applying integral-equation (IE) based method and characteristic mode analysis, the radiation modal from each part of the structure can be quantified using the current. Therefore, the radiation hot spot can be identified. This method facilitates the CM method in real applications.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120858336","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}
A novel planar multi-band MIMO antenna system with eight elements for mobile application is investigated. The proposed MIMO system consists of four printed planar inverted - F antenna elements and four folded monopole antenna elements. The folded monopole antenna operates over a wide frequency range of 1.71-3.91 GHz, which covers the long-term evolution (LTE), worldwide interpretability microwave access (WiMAX) and wireless local area network (WLAN) in 4G and 5G communication systems. The inverted-F antenna elements have a compact size of 13 $mathbf{mm}timespmb{7}$ mm and operate at 2.5 GHz and 3.5 GHz. Antenna Type I is surrounded by a L-shaped isolator extended ground for higher isolation and wideband resonance. This design leads to high isolation of the antenna elements in this study.
{"title":"Eight Elements Planar Multi-Band MIMO Antenna for Mobile Handsets","authors":"Jiangbo Duan, Kuiwen Xu, Yanqing Chu, Shichang Chen Pengzhao, Gaofeng Wang","doi":"10.1109/COMPEM.2018.8496544","DOIUrl":"https://doi.org/10.1109/COMPEM.2018.8496544","url":null,"abstract":"A novel planar multi-band MIMO antenna system with eight elements for mobile application is investigated. The proposed MIMO system consists of four printed planar inverted - F antenna elements and four folded monopole antenna elements. The folded monopole antenna operates over a wide frequency range of 1.71-3.91 GHz, which covers the long-term evolution (LTE), worldwide interpretability microwave access (WiMAX) and wireless local area network (WLAN) in 4G and 5G communication systems. The inverted-F antenna elements have a compact size of 13 $mathbf{mm}timespmb{7}$ mm and operate at 2.5 GHz and 3.5 GHz. Antenna Type I is surrounded by a L-shaped isolator extended ground for higher isolation and wideband resonance. This design leads to high isolation of the antenna elements in this study.","PeriodicalId":221352,"journal":{"name":"2018 IEEE International Conference on Computational Electromagnetics (ICCEM)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131045165","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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