Pub Date : 2015-02-01DOI: 10.1109/COMPEM.2015.7052549
W. Hong, F. Xu, Zhi-Qing Lv, Xiang An, Weidong Li, Zhe Song, Li Yan, Houxing Zhou
In this talk, some efficient methods for the electromagnetic (EM) simulation of periodic structures are reviewed, including the Method of Lines (MoL) and the Finite Difference Frequency Domain (FDFD) method for the propagation characteristic simulation of substrate integrated waveguide (SIW), and the Partial Basic Solution Vector (PBSV) based Domain Decomposition Method (DDM) for the scattering and propagation simulation of various periodic structures etc.
{"title":"Some efficient methods for the electromagnetic simulation of periodic structures","authors":"W. Hong, F. Xu, Zhi-Qing Lv, Xiang An, Weidong Li, Zhe Song, Li Yan, Houxing Zhou","doi":"10.1109/COMPEM.2015.7052549","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052549","url":null,"abstract":"In this talk, some efficient methods for the electromagnetic (EM) simulation of periodic structures are reviewed, including the Method of Lines (MoL) and the Finite Difference Frequency Domain (FDFD) method for the propagation characteristic simulation of substrate integrated waveguide (SIW), and the Partial Basic Solution Vector (PBSV) based Domain Decomposition Method (DDM) for the scattering and propagation simulation of various periodic structures etc.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"101 1","pages":"43-44"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77392837","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052636
Yuxiang Sun, X. Fang, K. Leung
This paper investigates a wideband cylindrical transparent dielectric resonator antenna (DRA), working as a light cover. The antenna is made of transparent materials. To broaden its bandwidth, two layers of transparent materials with different dielectric constants are put together. The lower layer has a hollow region for the accommodation of an LED light source. The VSWR, radiation pattern, and antenna gain are simulated and measured. Results show that it can simultaneously work as an antenna and a light cover, with negligible effects of the LED light source on the antenna performance.
{"title":"Wideband two-layer transparent cylindrical dielectric resonator antenna used as a light cover","authors":"Yuxiang Sun, X. Fang, K. Leung","doi":"10.1109/COMPEM.2015.7052636","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052636","url":null,"abstract":"This paper investigates a wideband cylindrical transparent dielectric resonator antenna (DRA), working as a light cover. The antenna is made of transparent materials. To broaden its bandwidth, two layers of transparent materials with different dielectric constants are put together. The lower layer has a hollow region for the accommodation of an LED light source. The VSWR, radiation pattern, and antenna gain are simulated and measured. Results show that it can simultaneously work as an antenna and a light cover, with negligible effects of the LED light source on the antenna performance.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"45 1","pages":"286-287"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78150984","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052570
H. A. Ulku, S. B. Sayed, H. Bağcı
An explicit marching on-in-time (MOT) based time domain electric field volume integral equation (TDVIE) solver for characterizing electromagnetic wave interactions on scatterers with nonlinear material properties is proposed. Discretization of the unknown electric field intensity and flux density is carried out by half and full Schaubert-Wilton-Glisson basis functions, respectively. Coupled system of spatially discretized TDVIE and the nonlinear constitutive relation between the field intensity and the flux density is integrated in time to compute the samples of the unknowns. An explicit PE(CE)m scheme is used for this purpose. Explicitness allows for "easy" incorporation of the nonlinearity as a function only to be evaluated on the right hand side of the coupled system of equations. A numerical example that demonstrates the applicability of the proposed MOT scheme to analyzing electromagnetic interactions on Kerr-nonlinear scatterers is presented.
{"title":"An explicit MOT-TDVIE scheme for analyzing electromagnetic field interactions on nonlinear scatterers","authors":"H. A. Ulku, S. B. Sayed, H. Bağcı","doi":"10.1109/COMPEM.2015.7052570","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052570","url":null,"abstract":"An explicit marching on-in-time (MOT) based time domain electric field volume integral equation (TDVIE) solver for characterizing electromagnetic wave interactions on scatterers with nonlinear material properties is proposed. Discretization of the unknown electric field intensity and flux density is carried out by half and full Schaubert-Wilton-Glisson basis functions, respectively. Coupled system of spatially discretized TDVIE and the nonlinear constitutive relation between the field intensity and the flux density is integrated in time to compute the samples of the unknowns. An explicit PE(CE)m scheme is used for this purpose. Explicitness allows for \"easy\" incorporation of the nonlinearity as a function only to be evaluated on the right hand side of the coupled system of equations. A numerical example that demonstrates the applicability of the proposed MOT scheme to analyzing electromagnetic interactions on Kerr-nonlinear scatterers is presented.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"10 1","pages":"101-103"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87610689","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052648
Yong-Dan Kong, Q. Chu
The unconditionally-stable four-stages split-step finite-difference time-domain (SS4-FDTD) method is extended to Debye dispersive media, which based on the auxiliary differential equation (ADE) formulation. Furthermore, numerical results are carried out for different Courant-Friedrichs-Lewy numbers in two-dimensional domains, which shown that the proposed method is unconditionally-stable.
{"title":"Extension of the unconditionally-stable four-stages split-step FDTD method to debye dispersive media","authors":"Yong-Dan Kong, Q. Chu","doi":"10.1109/COMPEM.2015.7052648","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052648","url":null,"abstract":"The unconditionally-stable four-stages split-step finite-difference time-domain (SS4-FDTD) method is extended to Debye dispersive media, which based on the auxiliary differential equation (ADE) formulation. Furthermore, numerical results are carried out for different Courant-Friedrichs-Lewy numbers in two-dimensional domains, which shown that the proposed method is unconditionally-stable.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"28 1","pages":"321-323"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80308794","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052583
M. Li, R. Chen, M. Francavilla, G. Vecchi
We introduce a kernel-independent wideband nested equivalent source approximation method. The nested equivalent source approximation (NESA), proposed by these authors to solve low frequency problems with linear complexity, is extended here to electrically large multiscale structures. The low frequency algorithm is directly employed at the bottom levels of an Octree clustering; in the high frequency regime, the directional low rank property is exploited, yielding a nested directional algorithm (Wideband NESA-WNESA) with O(N log N) complexity. Numerical results demonstrate the validity of the proposed solver.
{"title":"A kernel-independent wideband nested equivalent source approximation","authors":"M. Li, R. Chen, M. Francavilla, G. Vecchi","doi":"10.1109/COMPEM.2015.7052583","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052583","url":null,"abstract":"We introduce a kernel-independent wideband nested equivalent source approximation method. The nested equivalent source approximation (NESA), proposed by these authors to solve low frequency problems with linear complexity, is extended here to electrically large multiscale structures. The low frequency algorithm is directly employed at the bottom levels of an Octree clustering; in the high frequency regime, the directional low rank property is exploited, yielding a nested directional algorithm (Wideband NESA-WNESA) with O(N log N) complexity. Numerical results demonstrate the validity of the proposed solver.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"22 1","pages":"138-140"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85966573","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052662
Meng Zhang, Bin Li, Yong Liu, X. Lv
A full polarization reconfigurable dielectric resonator antenna (DRA) is proposed in this paper. Fed with a quasi-lumped quadrature coupler (QLQC), the DRA can achieve vertical linear, horizontal linear, left-handed circular and right-handed circular polarization simply by changing the mode and input port of the hybrid. A reconfigurable DRA operating at 3.5 GHz has been investigated. Due to the wideband characteristic of DRA, the impedance bandwidth (S11 <; -10dB) of linear polarization (LP) is 12.6% with reasonable gain. The bandwidth of circular polarization is 15.1% with S11 lower than -10 dB and gain in the boresight direction over 5dBi.
{"title":"Polarization tunable dielectric resonator antenna with quasi-lumped quadrature coupler","authors":"Meng Zhang, Bin Li, Yong Liu, X. Lv","doi":"10.1109/COMPEM.2015.7052662","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052662","url":null,"abstract":"A full polarization reconfigurable dielectric resonator antenna (DRA) is proposed in this paper. Fed with a quasi-lumped quadrature coupler (QLQC), the DRA can achieve vertical linear, horizontal linear, left-handed circular and right-handed circular polarization simply by changing the mode and input port of the hybrid. A reconfigurable DRA operating at 3.5 GHz has been investigated. Due to the wideband characteristic of DRA, the impedance bandwidth (S11 <; -10dB) of linear polarization (LP) is 12.6% with reasonable gain. The bandwidth of circular polarization is 15.1% with S11 lower than -10 dB and gain in the boresight direction over 5dBi.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"28 1","pages":"361-362"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91001651","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052651
N. Makwana, A. Chatterjee
A Large Time Step (LTS) method is used in the Finite Volume Time Domain (FVTD) framework for the solution of time domain Maxwell's equations. The LTS method [1] was originally proposed for the numerical solution of nonlinear hyperbolic conservation laws, as a generalization of the classical Godunov's approach which requires Riemann problems to be solved at individual cell faces in a finite volume framework. The LTS method allows the use of time steps much larger than that dictated by the Courant-Friedrich-Lewy (CFL) stability criterion for numerical solution of wave dominated problems. Long simulation times are a major concern in electromagnetic scattering problems involving large electrical sizes and re-entrant structures. The use of very large time steps in the propagation of EM waves both in freespace and multiple media is demonstrated in this work using a LTS based FVTD method.
{"title":"Fast solution of time domain Maxwell's equations using large time steps","authors":"N. Makwana, A. Chatterjee","doi":"10.1109/COMPEM.2015.7052651","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052651","url":null,"abstract":"A Large Time Step (LTS) method is used in the Finite Volume Time Domain (FVTD) framework for the solution of time domain Maxwell's equations. The LTS method [1] was originally proposed for the numerical solution of nonlinear hyperbolic conservation laws, as a generalization of the classical Godunov's approach which requires Riemann problems to be solved at individual cell faces in a finite volume framework. The LTS method allows the use of time steps much larger than that dictated by the Courant-Friedrich-Lewy (CFL) stability criterion for numerical solution of wave dominated problems. Long simulation times are a major concern in electromagnetic scattering problems involving large electrical sizes and re-entrant structures. The use of very large time steps in the propagation of EM waves both in freespace and multiple media is demonstrated in this work using a LTS based FVTD method.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"21 1","pages":"330-332"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79889850","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052629
D. Nie, M. Zhang, Ning Li
The wind fetch and water depth will greatly impact the ocean waves from the perspective of their shape and statistical characteristics. In this paper, special focus is given to the joint influence of wind fetch and water depth upon Doppler spectrum of dynamic nonlinear ocean surfaces. The study is based on the simulation of two-dimensional fetch- and depth-changed sea surfaces via nonlinear revised choppy wave model (RCWM). Then the Doppler spectral characteristics of echoes from simulated surfaces are mainly analyzed in detail by applying second-order small slope approximation (SSA-2).
{"title":"The joint influences of wind fetch and water depth on Doppler spectrum of dynamic nonlinear ocean surfaces","authors":"D. Nie, M. Zhang, Ning Li","doi":"10.1109/COMPEM.2015.7052629","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052629","url":null,"abstract":"The wind fetch and water depth will greatly impact the ocean waves from the perspective of their shape and statistical characteristics. In this paper, special focus is given to the joint influence of wind fetch and water depth upon Doppler spectrum of dynamic nonlinear ocean surfaces. The study is based on the simulation of two-dimensional fetch- and depth-changed sea surfaces via nonlinear revised choppy wave model (RCWM). Then the Doppler spectral characteristics of echoes from simulated surfaces are mainly analyzed in detail by applying second-order small slope approximation (SSA-2).","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"48 1","pages":"267-269"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84363372","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052621
Min Zhang, T. Zeng, F. Su
This work presents a peculiar phenomenon which occurs in the response at a cable terminal exposed to an incident plane wave. There is no even-order resonance peak in the induced voltage if the entire cable is irradiated perpendicularly. Theoretical formulation predicts the phenomenon which is in turn validated by a full-wave electromagnetic simulation of the scenario.
{"title":"Singularity study of induced cable response irradiated by plane-wave","authors":"Min Zhang, T. Zeng, F. Su","doi":"10.1109/COMPEM.2015.7052621","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052621","url":null,"abstract":"This work presents a peculiar phenomenon which occurs in the response at a cable terminal exposed to an incident plane wave. There is no even-order resonance peak in the induced voltage if the entire cable is irradiated perpendicularly. Theoretical formulation predicts the phenomenon which is in turn validated by a full-wave electromagnetic simulation of the scenario.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"19 1","pages":"244-246"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82881803","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 : 2015-02-01DOI: 10.1109/COMPEM.2015.7052618
Q. Hou
An effective magnetic loop array antenna with modified feeding structure is designed, fabricated and tested. This antenna works at 4.83 GHz-5.04 GHz, and radiate omnidirectionally in the azimuth plane. Compared with the original effective magnetic loop array antenna, the bandwidth increases 3 times. The average gain is 5.65 dB, and the elevation angles at different frequencies are about 30 degrees. This antenna is low profile and of compact structure, which is easy to be conformal to other surfaces.
{"title":"Effective magnetic loop array antenna with enhanced bandwidth","authors":"Q. Hou","doi":"10.1109/COMPEM.2015.7052618","DOIUrl":"https://doi.org/10.1109/COMPEM.2015.7052618","url":null,"abstract":"An effective magnetic loop array antenna with modified feeding structure is designed, fabricated and tested. This antenna works at 4.83 GHz-5.04 GHz, and radiate omnidirectionally in the azimuth plane. Compared with the original effective magnetic loop array antenna, the bandwidth increases 3 times. The average gain is 5.65 dB, and the elevation angles at different frequencies are about 30 degrees. This antenna is low profile and of compact structure, which is easy to be conformal to other surfaces.","PeriodicalId":6530,"journal":{"name":"2015 IEEE International Conference on Computational Electromagnetics","volume":"24 1","pages":"237-238"},"PeriodicalIF":0.0,"publicationDate":"2015-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83290268","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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