Pub Date : 2010-11-15DOI: 10.1109/URSI-EMTS.2010.5637225
P. Kowalczyk, M. Mrozowski
In this paper an accurate boundary condition is applied for analysis of open waveguiding structures properties. All types of modes are considered: guided, leaky and complex modes. The scheme is based on analytical solution obtained for homogeneous structure. The accuracy of the results is much better than in standard algorithm involving PML technique. The numerical tests show that the improvement is especially noticeable for imaginary part of the propagation coefficient which represents the radiation effects.
{"title":"Highly accurate Finite Difference analysis of leaky, guided and complex waves in photonic optical fibres and dielectric waveguidning structures","authors":"P. Kowalczyk, M. Mrozowski","doi":"10.1109/URSI-EMTS.2010.5637225","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637225","url":null,"abstract":"In this paper an accurate boundary condition is applied for analysis of open waveguiding structures properties. All types of modes are considered: guided, leaky and complex modes. The scheme is based on analytical solution obtained for homogeneous structure. The accuracy of the results is much better than in standard algorithm involving PML technique. The numerical tests show that the improvement is especially noticeable for imaginary part of the propagation coefficient which represents the radiation effects.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"39 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":"128136447","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.2010.5637234
C. Schmidt, T. Laitinen, T. Eibert
Near-field measurement and transformation techniques are widely applied to characterize the radiation pattern of antennas. Spherical near-field measurements have been researched widely and various techniques with different probe compensation capabilities and complexities exist. Among those techniques applicable for (almost) arbitrary probes and based on spherical wave translations, the crucial computational relaxations have been gained through the use of a Fourier Transform based preprocessing of the measurement data. It is shown in this paper that the same Fourier Transform based preprocessing step can be applied in conjunction with the plane wave based probe-corrected near-field far-field transformations. The collection of probe signals is split into smaller sub sets by an Inverse Fast Fourier Transform. These sub problems can be solved with a reduced overall complexity and also a full probe correction is achieved.
{"title":"Fast Fourier Transform preprocessing for accelerated plane wave based spherical near-field far-field transformation","authors":"C. Schmidt, T. Laitinen, T. Eibert","doi":"10.1109/URSI-EMTS.2010.5637234","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637234","url":null,"abstract":"Near-field measurement and transformation techniques are widely applied to characterize the radiation pattern of antennas. Spherical near-field measurements have been researched widely and various techniques with different probe compensation capabilities and complexities exist. Among those techniques applicable for (almost) arbitrary probes and based on spherical wave translations, the crucial computational relaxations have been gained through the use of a Fourier Transform based preprocessing of the measurement data. It is shown in this paper that the same Fourier Transform based preprocessing step can be applied in conjunction with the plane wave based probe-corrected near-field far-field transformations. The collection of probe signals is split into smaller sub sets by an Inverse Fast Fourier Transform. These sub problems can be solved with a reduced overall complexity and also a full probe correction is achieved.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"123 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":"133267886","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.2010.5637313
K. Ito, M. Ando, T. Shijo
PO-MoM is a hybrid method where Physical Optics Current Approximation is corrected by addition of the Fringe wave component (FW) obtained by Method of Moment (MoM). Authors have succeeded to define/localize the areas for the MoM on the scatterer by introducing the Fresnel zone number. Unfortunately, this area extends most of the scatterer surface for some specific combinations of the source and the observer and reduction of computational load fails. This paper introduces another high frequency concept of locality of diffraction, Local-MoM, proposed by the authors, for compensating this defect. Combined use of PO-MoM and Local-MoM realizes almost frequency independent number of unknowns.
{"title":"Combined use of PO-MoM and Local-MoM for reducing MoM areas for wide angular observation points","authors":"K. Ito, M. Ando, T. Shijo","doi":"10.1109/URSI-EMTS.2010.5637313","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637313","url":null,"abstract":"PO-MoM is a hybrid method where Physical Optics Current Approximation is corrected by addition of the Fringe wave component (FW) obtained by Method of Moment (MoM). Authors have succeeded to define/localize the areas for the MoM on the scatterer by introducing the Fresnel zone number. Unfortunately, this area extends most of the scatterer surface for some specific combinations of the source and the observer and reduction of computational load fails. This paper introduces another high frequency concept of locality of diffraction, Local-MoM, proposed by the authors, for compensating this defect. Combined use of PO-MoM and Local-MoM realizes almost frequency independent number of unknowns.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"55 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":"133031756","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.2010.5637108
R. Mittra, X. Yang, K. Panayappan, W. Yu
In this paper, we introduce a new general-purpose Computational Electromagnetics (CEM) algorithm, called RUFD (Recursive Algorithm Frequency Domain), for solving electromagnetic radiation and scattering problems in the frequency domain. The method shares many attributes with the Finite Difference Time Domain (FDTD), though it generates the solution of Maxwell's equations in the frequency rather than in the time domain. The method is therefore well suited for dealing with dispersive media, as well as for deriving solutions for problems that involve high-Q structures. It is also considerably more efficient for constructing low frequency solutions, in comparison to the FDTD algorithm, which requires long run times when an accurate solution is desired at low frequencies.
{"title":"RUFD: A general-purpose, non-iterative and matrix-free CEM algorithm for solving electromagnetic scattering and radiation problems in the frequency domain","authors":"R. Mittra, X. Yang, K. Panayappan, W. Yu","doi":"10.1109/URSI-EMTS.2010.5637108","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637108","url":null,"abstract":"In this paper, we introduce a new general-purpose Computational Electromagnetics (CEM) algorithm, called RUFD (Recursive Algorithm Frequency Domain), for solving electromagnetic radiation and scattering problems in the frequency domain. The method shares many attributes with the Finite Difference Time Domain (FDTD), though it generates the solution of Maxwell's equations in the frequency rather than in the time domain. The method is therefore well suited for dealing with dispersive media, as well as for deriving solutions for problems that involve high-Q structures. It is also considerably more efficient for constructing low frequency solutions, in comparison to the FDTD algorithm, which requires long run times when an accurate solution is desired at low frequencies.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"28 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114099596","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.2010.5637177
S. Tkachenko, J. Nitsch, R. Vick
The coupling of high-frequency electromagnetic fields with thin wire structures - transmission lines and antennas - inside a resonator is considered. For the analytical solution of the EFIE we used the method of analytical regularization, hybrid representation of the resonator Green's function, and transmission-line approximation.
{"title":"HF coupling to a transmission line inside a rectangular cavity","authors":"S. Tkachenko, J. Nitsch, R. Vick","doi":"10.1109/URSI-EMTS.2010.5637177","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637177","url":null,"abstract":"The coupling of high-frequency electromagnetic fields with thin wire structures - transmission lines and antennas - inside a resonator is considered. For the analytical solution of the EFIE we used the method of analytical regularization, hybrid representation of the resonator Green's function, and transmission-line approximation.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"194 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":"114245439","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.2010.5637149
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.2010.5637194
D. Schobert, T. Eibert
A fast integral solution of the electric field integral equation employing multilevel Lagrange interpolation factorization of the free-space Green's function is presented. The multilevel interpolation representation works on the same oct-tree structure as it is common in the multilevel fast multipole methods. The drawback of the bad computational efficiency of the multilevel interpolation representation due to involved full translation operators is overcome by employing the Fast Fourier Transformation to achieve diagonalization. In a variety of examples, it is shown that this solver achieves excellent computation time and memory efficiencies. Even at very low frequencies it is possible to accelerate a not stabilized electric field integral equation solution which is known to be badly conditioned.
{"title":"A multilevel interpolating fast integral solver with fast fourier transform acceleration","authors":"D. Schobert, T. Eibert","doi":"10.1109/URSI-EMTS.2010.5637194","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637194","url":null,"abstract":"A fast integral solution of the electric field integral equation employing multilevel Lagrange interpolation factorization of the free-space Green's function is presented. The multilevel interpolation representation works on the same oct-tree structure as it is common in the multilevel fast multipole methods. The drawback of the bad computational efficiency of the multilevel interpolation representation due to involved full translation operators is overcome by employing the Fast Fourier Transformation to achieve diagonalization. In a variety of examples, it is shown that this solver achieves excellent computation time and memory efficiencies. Even at very low frequencies it is possible to accelerate a not stabilized electric field integral equation solution which is known to be badly conditioned.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"57 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":"122976341","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.2010.5637083
A. Derneryd, J. Fridén, A. Stjernman
Performance of two 0.3 wavelengths separated antennas in the 700 MHz band are evaluated and improved by connecting a matching and decoupling network to the antenna ports. It is shown through simulations that the network improves efficiency, diversity gain, MIMO Shannon capacity, and reduces the correlation coefficient. The concept is implemented and validated in two dual-antenna mock-ups with slightly different ground plane sizes.
{"title":"MIMO performance of closely spaced antennas in the 700 MHz band","authors":"A. Derneryd, J. Fridén, A. Stjernman","doi":"10.1109/URSI-EMTS.2010.5637083","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637083","url":null,"abstract":"Performance of two 0.3 wavelengths separated antennas in the 700 MHz band are evaluated and improved by connecting a matching and decoupling network to the antenna ports. It is shown through simulations that the network improves efficiency, diversity gain, MIMO Shannon capacity, and reduces the correlation coefficient. The concept is implemented and validated in two dual-antenna mock-ups with slightly different ground plane sizes.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"4 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":"123129917","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.2010.5637168
O. Malyuskin, V. Fusco
In this paper, for the first time, image manipulation using a dual- sided phase conjugated lens is discussed. We demonstrate the ability of the lens to magnify and de-magnify images by changing the frequency of the pump wave. In addition we demonstrate the focusing and displacement capabilities of the lens due to amplitude or phase control of the transmitted field. Finally, these diffraction limited image manipulation schemes can be augmented with evanescent-to-propagating field conversion in order to achieve subwavelength image resolution in the far field.
{"title":"Phase conjugating lens for image manipulation","authors":"O. Malyuskin, V. Fusco","doi":"10.1109/URSI-EMTS.2010.5637168","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637168","url":null,"abstract":"In this paper, for the first time, image manipulation using a dual- sided phase conjugated lens is discussed. We demonstrate the ability of the lens to magnify and de-magnify images by changing the frequency of the pump wave. In addition we demonstrate the focusing and displacement capabilities of the lens due to amplitude or phase control of the transmitted field. Finally, these diffraction limited image manipulation schemes can be augmented with evanescent-to-propagating field conversion in order to achieve subwavelength image resolution in the far field.","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":"125847613","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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