Pub Date : 2011-10-20DOI: 10.1109/URSIGASS.2011.6050444
M. Sidorenko
We obtain an exact integral representation of the free electromagnetic field as a superposition of localized elementary solutions. The representation involves the continuous wavelet transform. The results can be used for studying electromagnetic fields with multiscale structure.
{"title":"Wavelet analysis for an electromagnetic field","authors":"M. Sidorenko","doi":"10.1109/URSIGASS.2011.6050444","DOIUrl":"https://doi.org/10.1109/URSIGASS.2011.6050444","url":null,"abstract":"We obtain an exact integral representation of the free electromagnetic field as a superposition of localized elementary solutions. The representation involves the continuous wavelet transform. The results can be used for studying electromagnetic fields with multiscale structure.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"XCVII 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128678153","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.2010.5637092
C. Baum
This paper extends the design options for switched oscillators. The oscillator length is increased for a given frequency, up to a full wavelength for the differential version. Multiax cable topology is fundamental to these extensions.
{"title":"Variations on the switched-oscillator theme","authors":"C. Baum","doi":"10.1109/URSI-EMTS.2010.5637092","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637092","url":null,"abstract":"This paper extends the design options for switched oscillators. The oscillator length is increased for a given frequency, up to a full wavelength for the differential version. Multiax cable topology is fundamental to these extensions.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"75 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":"117341835","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.2010.5637364
A. Alonso, C. Mecklenbrauker, A. Paier, T. Zemen, N. Czink, F. Tufvesson
Reliability in Ricean multiple-input-multiple-output (MIMO) channels is crucial for safety related vehicle-to-vehicle (V2V) applications. Due to the time variability of vehicular communication channel, it is very significant to study the temporal evolution of channel characterization criteria. We present evaluation results of the temporal evolution of the spectral efficiency from channel sounder measurements of vehicle-to-vehicle MIMO radio channels in the 5.2 GHz band. Our results show that MIMO channels with higher spatial correlation lead to lower ergodic capacity and a reduced signal-to-noise ratio-dependent critical data rate. The temporal evolution of the ergodic capacity and critical data rate shows that the channel with the strongest line of sight (LoS) component also has the highest capacity. We also present a detailed analysis of the environmental factors affecting the capacity pattern throughout the measurement run. Dynamic scatterers introduce capacity bursts instantaneously; the trend stays congruent with the theory.
{"title":"Temporal evolution of channel capacity in vehicular MIMO channels in the 5 GHz band","authors":"A. Alonso, C. Mecklenbrauker, A. Paier, T. Zemen, N. Czink, F. Tufvesson","doi":"10.1109/URSI-EMTS.2010.5637364","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637364","url":null,"abstract":"Reliability in Ricean multiple-input-multiple-output (MIMO) channels is crucial for safety related vehicle-to-vehicle (V2V) applications. Due to the time variability of vehicular communication channel, it is very significant to study the temporal evolution of channel characterization criteria. We present evaluation results of the temporal evolution of the spectral efficiency from channel sounder measurements of vehicle-to-vehicle MIMO radio channels in the 5.2 GHz band. Our results show that MIMO channels with higher spatial correlation lead to lower ergodic capacity and a reduced signal-to-noise ratio-dependent critical data rate. The temporal evolution of the ergodic capacity and critical data rate shows that the channel with the strongest line of sight (LoS) component also has the highest capacity. We also present a detailed analysis of the environmental factors affecting the capacity pattern throughout the measurement run. Dynamic scatterers introduce capacity bursts instantaneously; the trend stays congruent with the theory.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"126 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":"127138020","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.2010.5637371
S. Bertl, J. Detlefsen
In the last years, several approaches for the detection of concealed threats at the body of a person have been developed using millimetre-waves. The utilisation of millimetre-waves allows for the detection of both metallic and non-metallic objects. Setups using active illumination mainly exploit coherence between transmitted and received signal to perform beamforming or processing along a synthetic aperture. When dielectric objects should be detected, the assumptions done in these processing steps are often no longer given. The same applies for objects that are placed in front of a reflecting background like the human skin. The effects that can occur for these conditions are discussed in this paper.
{"title":"Security-related active imaging of dielectric objects attached to human bodies","authors":"S. Bertl, J. Detlefsen","doi":"10.1109/URSI-EMTS.2010.5637371","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637371","url":null,"abstract":"In the last years, several approaches for the detection of concealed threats at the body of a person have been developed using millimetre-waves. The utilisation of millimetre-waves allows for the detection of both metallic and non-metallic objects. Setups using active illumination mainly exploit coherence between transmitted and received signal to perform beamforming or processing along a synthetic aperture. When dielectric objects should be detected, the assumptions done in these processing steps are often no longer given. The same applies for objects that are placed in front of a reflecting background like the human skin. The effects that can occur for these conditions are discussed in this paper.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"40 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":"127378153","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.2010.5637142
S. Caorsi, M. Stasolla
The goal of this paper is a preliminary robustness assessment of a recently published ANN-based algorithm for the evaluation of subsurface layers' properties. In particular, the analysis will focus on the dependency of overall performances on the training set dimensions and the neural networks capabilities of managing numerical errors.
{"title":"E.M. Inverse Scattering and Multi-Layer Perceptrons: Towards the automatic reconstruction of buried layers' properties","authors":"S. Caorsi, M. Stasolla","doi":"10.1109/URSI-EMTS.2010.5637142","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637142","url":null,"abstract":"The goal of this paper is a preliminary robustness assessment of a recently published ANN-based algorithm for the evaluation of subsurface layers' properties. In particular, the analysis will focus on the dependency of overall performances on the training set dimensions and the neural networks capabilities of managing numerical errors.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"79 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":"125011088","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.2010.5637298
L. Klimeš
We study how the perturbations of a generally heterogeneous bianisotropic structure manifest themselves in the wave field, and which perturbations can be detected within a limited aperture and a limited frequency band. A short-duration broad-band incident wave field with a smooth frequency spectrum is considered. Infinitesimally small perturbations of the constitutive tensor are decomposed into Gabor functions. The wave field scattered by the perturbations is then composed of waves scattered by the individual Gabor functions. The scattered waves are estimated using the first-order Born approximation with the paraxial ray approximation.
{"title":"Sensitivity of electromagnetic waves to a heterogeneous bianisotropic structure","authors":"L. Klimeš","doi":"10.1109/URSI-EMTS.2010.5637298","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637298","url":null,"abstract":"We study how the perturbations of a generally heterogeneous bianisotropic structure manifest themselves in the wave field, and which perturbations can be detected within a limited aperture and a limited frequency band. A short-duration broad-band incident wave field with a smooth frequency spectrum is considered. Infinitesimally small perturbations of the constitutive tensor are decomposed into Gabor functions. The wave field scattered by the perturbations is then composed of waves scattered by the individual Gabor functions. The scattered waves are estimated using the first-order Born approximation with the paraxial ray approximation.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"46 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":"123577194","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.2010.5636988
P. Sewell, T. Benson, C. Christopoulos, D. Thomas, A. Vukovic
The advantages of electromagnetic simulations operating on unstructured tetrahedral meshes are the availability of smooth boundary approximations and seamless multi-scale meshing. However in general, computational efficiency is notably better with regular elements and therefore in practice hybrid meshes usually provide the most valuable overall approach. In this paper we consider the scope of a particular tetrahedral scattering element that is both space filling and computationally efficient to implement in TLM simulations.
{"title":"Regular space filling tetrahedral elements for transmission line modelling (TLM)","authors":"P. Sewell, T. Benson, C. Christopoulos, D. Thomas, A. Vukovic","doi":"10.1109/URSI-EMTS.2010.5636988","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5636988","url":null,"abstract":"The advantages of electromagnetic simulations operating on unstructured tetrahedral meshes are the availability of smooth boundary approximations and seamless multi-scale meshing. However in general, computational efficiency is notably better with regular elements and therefore in practice hybrid meshes usually provide the most valuable overall approach. In this paper we consider the scope of a particular tetrahedral scattering element that is both space filling and computationally efficient to implement in TLM simulations.","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":"123667433","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.2010.5637295
H. Anastassiu, N. Tsitsas, P. Papakanellos
Electromagnetic Scattering from Discrete Bodies of Revolution (DBOR's) is performed by invoking a recently developed, recursive linear system direct solver. The problem is initially formulated via a standard Moment Method (MoM) with point matching, however the DBOR symmetry is taken into account to simplify calculations. Specifically, the MoM matrix is cast in a form comprising circulant blocks, which is amenable to eigenvalue decomposition, and subsequent direct matrix inversion by an efficient recursive technique.
{"title":"Scattering analysis of Discrete Bodies of Revolution via an efficient numerical algorithm","authors":"H. Anastassiu, N. Tsitsas, P. Papakanellos","doi":"10.1109/URSI-EMTS.2010.5637295","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637295","url":null,"abstract":"Electromagnetic Scattering from Discrete Bodies of Revolution (DBOR's) is performed by invoking a recently developed, recursive linear system direct solver. The problem is initially formulated via a standard Moment Method (MoM) with point matching, however the DBOR symmetry is taken into account to simplify calculations. Specifically, the MoM matrix is cast in a form comprising circulant blocks, which is amenable to eigenvalue decomposition, and subsequent direct matrix inversion by an efficient recursive technique.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"16 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":"125277831","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.2010.5637006
J. Bringuier, R. Mittra
In this paper the authors provide a rigorous full-wave simulation of Body Area Networks (BANs) using the FDTD. Some relevant statistical parameters for path loss are presented for different body-phantom models.
{"title":"Full-wave simulation of Body Area Networks using the FDTD method","authors":"J. Bringuier, R. Mittra","doi":"10.1109/URSI-EMTS.2010.5637006","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637006","url":null,"abstract":"In this paper the authors provide a rigorous full-wave simulation of Body Area Networks (BANs) using the FDTD. Some relevant statistical parameters for path loss are presented for different body-phantom models.","PeriodicalId":404116,"journal":{"name":"2010 URSI International Symposium on Electromagnetic Theory","volume":"65 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":"125515618","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.2010.5637365
V. Šarac
In this paper is used Finite Element Method-FEM for analysis of electromagnetic quantities of small micro motor - single phase shaded pole motor-SPSPM. FEM is widely used numerical method for solving nonlinear partial differential equations with variable coefficients. For that purpose motor model is developed with exact geometry and material's characteristics. Two different approaches are applied in FEM analysis of electromagnetic phenomena inside the motor: magneto-static where all electromagnetic quantities are analysed in exact moment of time meaning frequency f=0 Hz and time-harmonic magnetic approach where the magnetic field inside the machine is time varying, meaning frequency f=50 Hz. Obtained results are presented and compared with available analytical results
{"title":"Different approaches of numerical analysis of electromagnetic phenomena in shaded pole motor with application of finite elements method","authors":"V. Šarac","doi":"10.1109/URSI-EMTS.2010.5637365","DOIUrl":"https://doi.org/10.1109/URSI-EMTS.2010.5637365","url":null,"abstract":"In this paper is used Finite Element Method-FEM for analysis of electromagnetic quantities of small micro motor - single phase shaded pole motor-SPSPM. FEM is widely used numerical method for solving nonlinear partial differential equations with variable coefficients. For that purpose motor model is developed with exact geometry and material's characteristics. Two different approaches are applied in FEM analysis of electromagnetic phenomena inside the motor: magneto-static where all electromagnetic quantities are analysed in exact moment of time meaning frequency f=0 Hz and time-harmonic magnetic approach where the magnetic field inside the machine is time varying, meaning frequency f=50 Hz. Obtained results are presented and compared with available analytical results","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":"115199506","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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