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}
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.2010.5637038
M. Ravan, R. Amineh, N. Nikolova
A new two-dimensional (2D) microwave holographic technique is proposed to reconstruct the 2D image of a target. It is based on the data recorded by two antennas scanning two rectangular parallel apertures on both sides of a target. In this method the reflection coefficients of the antennas are first processed to localize target in the range direction. Then, the 2D image of the target is reconstructed. There is no assumption for the incident field and both the back-scattered and forward-scattered signals can be used to reconstruct the image of the target. This makes the technique applicable to tomographic measurements where the near-field signal transmitted through the target is measured.
{"title":"Near-field microwave holographic imaging: Target localization and resolution study","authors":"M. Ravan, R. Amineh, N. Nikolova","doi":"10.1109/URSI-EMTS.2010.5637038","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637038","url":null,"abstract":"A new two-dimensional (2D) microwave holographic technique is proposed to reconstruct the 2D image of a target. It is based on the data recorded by two antennas scanning two rectangular parallel apertures on both sides of a target. In this method the reflection coefficients of the antennas are first processed to localize target in the range direction. Then, the 2D image of the target is reconstructed. There is no assumption for the incident field and both the back-scattered and forward-scattered signals can be used to reconstruct the image of the target. This makes the technique applicable to tomographic measurements where the near-field signal transmitted through the target is measured.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"6 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":"122223595","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.2010.5637212
M. Lyalinov, N. Zhu
In the present work we study the diffraction of the electromagnetic field from dipole located over an impedance wedge. We give the asymptotic expressions of the reflected waves from the wedge's faces, of the diffracted wave from the edge as well as those of the surface waves along the impedance faces. It is assumed that the source is not located in a close vicinity of the wedge's faces.
{"title":"The diffraction of a dipole-field by an impedance wedge","authors":"M. Lyalinov, N. Zhu","doi":"10.1109/URSI-EMTS.2010.5637212","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637212","url":null,"abstract":"In the present work we study the diffraction of the electromagnetic field from dipole located over an impedance wedge. We give the asymptotic expressions of the reflected waves from the wedge's faces, of the diffracted wave from the edge as well as those of the surface waves along the impedance faces. It is assumed that the source is not located in a close vicinity of the wedge's faces.","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":"127837497","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.2010.5637035
S. Kidera, T. Sakamoto, Toru Sato
Near field radar employing UWB (Ultra Wideband) signals with its high range resolution is promising as various sensing applications. It enables robotic or security sensors that can identify a human body in invisible situations. As one of the most promising radar algorithms, the RPM (Range Points Migration) is proposed. This offers an accurate 3-D (3-dimensional) surface extraction for various target shape. However, in the case of a complicated target surface whose variation scale is less than wavelength, it still suffers from image distortion caused by multiple interference signals with different waveforms. As a substantial solution, this paper proposes a novel range extraction algorithm by extending the Capon, known as frequency domain interferometry (FDI). This algorithm combines reference signal optimization with the original Capon to enhance the accuracy and resolution for an observed range into which a deformed waveform model is introduced. The results obtained from numerical simulations and an experiment prove that super-resolution UWB radar imaging is achieved by the proposed method, even for an extremely complex-surface target, including edges.
{"title":"Experimental study on super-resolution 3-D imaging algorithm based on extended capon with reference signal optimization for UWB radars","authors":"S. Kidera, T. Sakamoto, Toru Sato","doi":"10.1109/URSI-EMTS.2010.5637035","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637035","url":null,"abstract":"Near field radar employing UWB (Ultra Wideband) signals with its high range resolution is promising as various sensing applications. It enables robotic or security sensors that can identify a human body in invisible situations. As one of the most promising radar algorithms, the RPM (Range Points Migration) is proposed. This offers an accurate 3-D (3-dimensional) surface extraction for various target shape. However, in the case of a complicated target surface whose variation scale is less than wavelength, it still suffers from image distortion caused by multiple interference signals with different waveforms. As a substantial solution, this paper proposes a novel range extraction algorithm by extending the Capon, known as frequency domain interferometry (FDI). This algorithm combines reference signal optimization with the original Capon to enhance the accuracy and resolution for an observed range into which a deformed waveform model is introduced. The results obtained from numerical simulations and an experiment prove that super-resolution UWB radar imaging is achieved by the proposed method, even for an extremely complex-surface target, including edges.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"11 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":"133146597","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.2010.5637011
V. Timchenko, E. Heyman, A. Boag
We present a software package INDOOR-GBS (Gaussian Beam Summation) designed to simulate indoor electro-magnetic field propagation in the ultra wideband (UWB) regime. The package is based on the GBS method where the field of the transmitting antenna is expanded into a superposition of GBs that emerge from the source in a discrete set of directions. Thereafter the beams are traced in the configuration through multiple reflections and transmissions at the walls/ceilings/floors and the field is calculated by summing the contributions of the beams that pass near the zone of interest. The algorithm consists mainly of two phases: a processing phase where the beams are traced through the medium, and a post-processing phase where the field and the channel parameters are calculated for the given source and receiver antennas. The processing phase utilizes a dyadic electromagnetic formulation so that the antennas' properties are used only in the post-processing phase, thus facilitating efficient post-processing calculations for antenna and channel optimization. The algorithm also employs a particular set of isodiffracting GBs (ID-GB), whose propagation characteristics are frequency independent and lead to efficient UWB calculations.
{"title":"Gaussian beam summation algorithm for ultra wide band indoor channel characterization","authors":"V. Timchenko, E. Heyman, A. Boag","doi":"10.1109/URSI-EMTS.2010.5637011","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637011","url":null,"abstract":"We present a software package INDOOR-GBS (Gaussian Beam Summation) designed to simulate indoor electro-magnetic field propagation in the ultra wideband (UWB) regime. The package is based on the GBS method where the field of the transmitting antenna is expanded into a superposition of GBs that emerge from the source in a discrete set of directions. Thereafter the beams are traced in the configuration through multiple reflections and transmissions at the walls/ceilings/floors and the field is calculated by summing the contributions of the beams that pass near the zone of interest. The algorithm consists mainly of two phases: a processing phase where the beams are traced through the medium, and a post-processing phase where the field and the channel parameters are calculated for the given source and receiver antennas. The processing phase utilizes a dyadic electromagnetic formulation so that the antennas' properties are used only in the post-processing phase, thus facilitating efficient post-processing calculations for antenna and channel optimization. The algorithm also employs a particular set of isodiffracting GBs (ID-GB), whose propagation characteristics are frequency independent and lead to efficient UWB calculations.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"51 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":"133215259","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.2010.5637137
P. M. van den Berg, A. Abubakar
Optical Imaging of the permittivity profile from optical diffraction tomography data is discussed. In order to arrive at sub-100 nm resolution it is necessary to employ nonlinear inversion methods that yield quantitative information of the permittivity distribution. Therefore, the so-called multiplicative regularized contrast source inversion (MR-CSI) method is adopted to solve the problem at hand. For a two-dimensional representative example, it is demonstrated that, using a wavelength of 400 nm, resolutions of the order of 20 to 30 nm can be achieved.
{"title":"Digital optical microscopy using the MR-CSI method","authors":"P. M. van den Berg, A. Abubakar","doi":"10.1109/URSI-EMTS.2010.5637137","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637137","url":null,"abstract":"Optical Imaging of the permittivity profile from optical diffraction tomography data is discussed. In order to arrive at sub-100 nm resolution it is necessary to employ nonlinear inversion methods that yield quantitative information of the permittivity distribution. Therefore, the so-called multiplicative regularized contrast source inversion (MR-CSI) method is adopted to solve the problem at hand. For a two-dimensional representative example, it is demonstrated that, using a wavelength of 400 nm, resolutions of the order of 20 to 30 nm can be achieved.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"34 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":"115786454","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.2010.5637272
M. Furqan, L. Vietzorreck
In this contribution new developments in the Methods of Lines (MoL) are shown, which make the method to a competitive tool for the analysis of cascaded structures with repetitive sections. The MoL is very well suited for the analysis of layered or cascaded elements, as it uses only a two-dimensional discretization, within the layers or sections analytic calculation is used. Nevertheless, due to the required eigenmode analysis the needed computation time needed is still high compared to commercial tools. Several approaches have been developed in order to make the MoL more efficient, here some of these features have been combined to a new algorithm. First Floquet`s theorem is efficiently used to analyze structures with repeating sections without significant increase in computation time. The number of employed modes is reduced by applying the principle of localized and accessible modes. Last an additional but fast 2D analysis is used to increase the accuracy in determining the loss of lossy conductors. A comparison is made for a distributed MEMS transmission line (DMTL) with up to 20 sections, comparing the results of the new MoL algorithm with commercial tools.
{"title":"New modelling aspects in the Method of Lines","authors":"M. Furqan, L. Vietzorreck","doi":"10.1109/URSI-EMTS.2010.5637272","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637272","url":null,"abstract":"In this contribution new developments in the Methods of Lines (MoL) are shown, which make the method to a competitive tool for the analysis of cascaded structures with repetitive sections. The MoL is very well suited for the analysis of layered or cascaded elements, as it uses only a two-dimensional discretization, within the layers or sections analytic calculation is used. Nevertheless, due to the required eigenmode analysis the needed computation time needed is still high compared to commercial tools. Several approaches have been developed in order to make the MoL more efficient, here some of these features have been combined to a new algorithm. First Floquet`s theorem is efficiently used to analyze structures with repeating sections without significant increase in computation time. The number of employed modes is reduced by applying the principle of localized and accessible modes. Last an additional but fast 2D analysis is used to increase the accuracy in determining the loss of lossy conductors. A comparison is made for a distributed MEMS transmission line (DMTL) with up to 20 sections, comparing the results of the new MoL algorithm with commercial tools.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"67 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":"115977981","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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