Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637149
P. Demarcke, H. Rogier
This article presents a hybrid finite element-boundary integral equation (FE-BIE) method where the boundary integral interactions containing the 2D Green's kernel function are accelerated by the nondirective stable plane wave multilevel fast multipole algorithm (NSPW-MLFMA). This hybrid method enables the fast simulation of very large scale scattering problems with multiple homogeneous and inhomogeneous dielectrics and perfectly electric conducting (PEC) objects. The new hybrid technique with FMM acceleration applies for both high frequency as low frequency as long as the finite element mesh is sufficiently fine to contain the numerical dispersion within the desired accuracy. The hybrid formulation is outlined, and its validity is demonstrated by means of a 2D scattering problem.
{"title":"Hybrid finite element-boundary integral method accelerated by the NSPW-MLFMA","authors":"P. Demarcke, H. Rogier","doi":"10.1109/URSI-EMTS.2010.5637149","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637149","url":null,"abstract":"This article presents a hybrid finite element-boundary integral equation (FE-BIE) method where the boundary integral interactions containing the 2D Green's kernel function are accelerated by the nondirective stable plane wave multilevel fast multipole algorithm (NSPW-MLFMA). This hybrid method enables the fast simulation of very large scale scattering problems with multiple homogeneous and inhomogeneous dielectrics and perfectly electric conducting (PEC) objects. The new hybrid technique with FMM acceleration applies for both high frequency as low frequency as long as the finite element mesh is sufficiently fine to contain the numerical dispersion within the desired accuracy. The hybrid formulation is outlined, and its validity is demonstrated by means of a 2D scattering problem.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123489063","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637361
O. Klemp
Vehicle-to-vehicle (V2V) communications systems focus on the improvement of driver safety and traffic efficiency using the recently designated frequency bands in the 5.9GHz range in Europe. Due to the time-frequency selective fading behaviour of the vehicular communication channel, antenna-related effects impacted by the vehicular mounting position and mutual coupling play an integral role in the performance of V2V communications. This paper focuses on the analysis of characteristic antenna effects that are subject to vehicular mounting. Example multi-element antenna (MEA) topologies are considered to improve the reliability of the wireless link by diversity combining in order to meet the stringent requirements of real-time communications.
{"title":"Performance considerations for automotive antenna equipment in vehicle-to-vehicle communications","authors":"O. Klemp","doi":"10.1109/URSI-EMTS.2010.5637361","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637361","url":null,"abstract":"Vehicle-to-vehicle (V2V) communications systems focus on the improvement of driver safety and traffic efficiency using the recently designated frequency bands in the 5.9GHz range in Europe. Due to the time-frequency selective fading behaviour of the vehicular communication channel, antenna-related effects impacted by the vehicular mounting position and mutual coupling play an integral role in the performance of V2V communications. This paper focuses on the analysis of characteristic antenna effects that are subject to vehicular mounting. Example multi-element antenna (MEA) topologies are considered to improve the reliability of the wireless link by diversity combining in order to meet the stringent requirements of real-time communications.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"10 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120857229","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637114
R. Persico, F. Soldovieri
In this paper some methodological aspects relevant to GPR prospecting under a linear model are proposed. In particular, it will be presented how the exploitation of the Diffraction Tomography (DT), joined to the tool of the Singular Value Decomposition (SVD) allows to give an answer to several theoretical and above all strategic problems in GPR prospecting.
{"title":"Recent issues relevant to GPR prospecting","authors":"R. Persico, F. Soldovieri","doi":"10.1109/URSI-EMTS.2010.5637114","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637114","url":null,"abstract":"In this paper some methodological aspects relevant to GPR prospecting under a linear model are proposed. In particular, it will be presented how the exploitation of the Diffraction Tomography (DT), joined to the tool of the Singular Value Decomposition (SVD) allows to give an answer to several theoretical and above all strategic problems in GPR prospecting.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"255 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123286481","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637287
Chih-Yu Wang, Shih-yung Chung, C. Teng, Chung-Ping Chen, Hung-chun Chang
A pseudospectral frequency-domain (PSFD) method with multi-domain approach and based on Legendre polynomials is developed for solving Maxwell's equations. One aim of the proposed method is to more accurately model problems in plasmonics in which electromagnetic waves interact with metallic structures at optical frequencies. Calculation of light scattering by a silver circular cylinder demonstrates that the accuracy of the obtained field strength can be as good as on the order of 10−9 of the incident field strength.
{"title":"A legendre pseudospectral frequency-domain method for solving Maxwell's equations","authors":"Chih-Yu Wang, Shih-yung Chung, C. Teng, Chung-Ping Chen, Hung-chun Chang","doi":"10.1109/URSI-EMTS.2010.5637287","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637287","url":null,"abstract":"A pseudospectral frequency-domain (PSFD) method with multi-domain approach and based on Legendre polynomials is developed for solving Maxwell's equations. One aim of the proposed method is to more accurately model problems in plasmonics in which electromagnetic waves interact with metallic structures at optical frequencies. Calculation of light scattering by a silver circular cylinder demonstrates that the accuracy of the obtained field strength can be as good as on the order of 10−9 of the incident field strength.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128417384","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637254
L. Klinkenbusch
A spherical-multipole based approach is introduced to efficiently obtain the time-domain near- and far-field of any arbitrary localized current or equivalent-current source distribution. The method is based on the Fourier transform of the frequency-domain spherical-multipole expansion and on a finite expansion of the spherical Hankel function of the 2nd kind. It leads to a time-domain spherical-multipole expansion valid in the free space outside a minimum sphere containing all electromagnetic sources. By means of new recurrence relations the additional time-domain multipole amplitudes needed for the complete representation of the near field can be very efficiently calculated from the time-domain amplitudes dominant in the far field. The latter can be obtained by a recently proposed spherical-multipole based time-domain near-field to far-field algorithm which is particularly suited for FDTD.
{"title":"Spherical-multipole based time-domain near-field to near-field transformation","authors":"L. Klinkenbusch","doi":"10.1109/URSI-EMTS.2010.5637254","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637254","url":null,"abstract":"A spherical-multipole based approach is introduced to efficiently obtain the time-domain near- and far-field of any arbitrary localized current or equivalent-current source distribution. The method is based on the Fourier transform of the frequency-domain spherical-multipole expansion and on a finite expansion of the spherical Hankel function of the 2nd kind. It leads to a time-domain spherical-multipole expansion valid in the free space outside a minimum sphere containing all electromagnetic sources. By means of new recurrence relations the additional time-domain multipole amplitudes needed for the complete representation of the near field can be very efficiently calculated from the time-domain amplitudes dominant in the far field. The latter can be obtained by a recently proposed spherical-multipole based time-domain near-field to far-field algorithm which is particularly suited for FDTD.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128914630","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637026
Yiwei He, Y. Akizuki
In this paper, the planar spiral antennas for the ground penetrating radar (GPR) were calculated by using FDTD method. The frequency characteristics of the impedance ware discussed by changing the expansion angle of the planar element and the winding angle of the spiral. It was observed that a wide-band characteristics can be realized by a careful design of the antenna shape. Because the transient response of a GPR antenna is very important, the transient radiated electromagnetic wave was also investigated.
{"title":"FDTD analysis of a planar spiral antennas for the ground penetrating radar","authors":"Yiwei He, Y. Akizuki","doi":"10.1109/URSI-EMTS.2010.5637026","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637026","url":null,"abstract":"In this paper, the planar spiral antennas for the ground penetrating radar (GPR) were calculated by using FDTD method. The frequency characteristics of the impedance ware discussed by changing the expansion angle of the planar element and the winding angle of the spiral. It was observed that a wide-band characteristics can be realized by a careful design of the antenna shape. Because the transient response of a GPR antenna is very important, the transient radiated electromagnetic wave was also investigated.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130568431","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637227
S. Rengarajan
We present a perturbation technique for improving the design parameters of a waveguide-fed planar slot array consisting of longitudinal radiating slots and centered-inclined coupling slots. Initial design is performed using the well-known Elliott technique. Subsequently a method-of-moments solution to the pertinent coupled integral equations of the aperture electric field of all slots in the array is employed to perturb the slot parameters. This process improves the slot aperture distribution and the return loss.
{"title":"A perturbation technique for improving the design of a planar slot array","authors":"S. Rengarajan","doi":"10.1109/URSI-EMTS.2010.5637227","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637227","url":null,"abstract":"We present a perturbation technique for improving the design parameters of a waveguide-fed planar slot array consisting of longitudinal radiating slots and centered-inclined coupling slots. Initial design is performed using the well-known Elliott technique. Subsequently a method-of-moments solution to the pertinent coupled integral equations of the aperture electric field of all slots in the array is employed to perturb the slot parameters. This process improves the slot aperture distribution and the return loss.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131026966","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637392
T. Warburton
A low storage curvilinear discontinuous Galerkin method for simulating time domain electromagnetic wave propagation is presented. The algorithm has substantially lower storage requirements than the standard discontinuous Galerkin time-domain method when applied to meshes with a large number of curvilinear elements. An analytical energy stability analysis is summarized and some experimental results show that the novel method does not strongly impact accuracy.
{"title":"A low storage curvilinear discontinuous Galerkin time-domain method for electromagnetics","authors":"T. Warburton","doi":"10.1109/URSI-EMTS.2010.5637392","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637392","url":null,"abstract":"A low storage curvilinear discontinuous Galerkin method for simulating time domain electromagnetic wave propagation is presented. The algorithm has substantially lower storage requirements than the standard discontinuous Galerkin time-domain method when applied to meshes with a large number of curvilinear elements. An analytical energy stability analysis is summarized and some experimental results show that the novel method does not strongly impact accuracy.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124496150","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637379
G. Fikioris, N. Tsitsas, I. Psarros
The auxiliary surface current, determined by applying the Method of Auxiliary Sources (MAS) to scattering problems by perfect conductors, may exhibit a certain form of oscillations, which are inherent to MAS and are independent of the word-length and the numerical-integration routines. The purpose of the present work is to demonstrate analytically that the “extended integral equation” (which is similar to the MAS one with the main difference that the unknown is the actual surface current on the scatterer) does not exhibit oscillations of the type described above. Hence, oscillations occurring in the extended integral equation are likely to be due to finite word-length or numerical integration errors.
{"title":"Differences between extended-integral-equation and method-of-auxiliary-sources solutions of a simple scattering problem","authors":"G. Fikioris, N. Tsitsas, I. Psarros","doi":"10.1109/URSI-EMTS.2010.5637379","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637379","url":null,"abstract":"The auxiliary surface current, determined by applying the Method of Auxiliary Sources (MAS) to scattering problems by perfect conductors, may exhibit a certain form of oscillations, which are inherent to MAS and are independent of the word-length and the numerical-integration routines. The purpose of the present work is to demonstrate analytically that the “extended integral equation” (which is similar to the MAS one with the main difference that the unknown is the actual surface current on the scatterer) does not exhibit oscillations of the type described above. Hence, oscillations occurring in the extended integral equation are likely to be due to finite word-length or numerical integration errors.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126027250","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 : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5636993
M. Stallein, B. Bandlow, R. Schuhmann
Integrated optical waveguides on PCB level are a promising technology to enhance data transfer rates. For minimal tolerance requirements these waveguides are multimodal, accordingly ray optical methods are used to analyze the transfer behavior. In this context the limits of ray optical methods are not well-known. It is the aim of this work to validate these methods by comparison with a wave analysis of bent dielectric slab waveguides. This analysis uses quasi-guided modes that are appropriate to simulate the optical power flow after passing a 90° bend. The fields of a Gaussian beam serve as reference source.
{"title":"Validation of ray optics capability to analyze the transfer behavior of bent optical slab waveguides","authors":"M. Stallein, B. Bandlow, R. Schuhmann","doi":"10.1109/URSI-EMTS.2010.5636993","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5636993","url":null,"abstract":"Integrated optical waveguides on PCB level are a promising technology to enhance data transfer rates. For minimal tolerance requirements these waveguides are multimodal, accordingly ray optical methods are used to analyze the transfer behavior. In this context the limits of ray optical methods are not well-known. It is the aim of this work to validate these methods by comparison with a wave analysis of bent dielectric slab waveguides. This analysis uses quasi-guided modes that are appropriate to simulate the optical power flow after passing a 90° bend. The fields of a Gaussian beam serve as reference source.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126739137","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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