Pub Date : 2007-11-21DOI: 10.1109/ICEAA.2007.4387300
R. Rotman
This paper reviews an early pioneering work on metamaterials to give insight into the relationship between artificial dielectrics and the suggested DNG (double negative epsiv and mu) materials.
{"title":"Early Work on Artificial Dielectrics, Periodic Structures and Their Relationship to Modern Metamaterials","authors":"R. Rotman","doi":"10.1109/ICEAA.2007.4387300","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387300","url":null,"abstract":"This paper reviews an early pioneering work on metamaterials to give insight into the relationship between artificial dielectrics and the suggested DNG (double negative epsiv and mu) materials.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133943521","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387404
Y. Ravinder, V. Pandharipande
A dual (polarization and spatial) diversity smart antenna using Triple co-centered orthogonal loop and dipole (Triple-COLD) array is presented. It exploits polarization diversity to support more users in spatial diversity scenario when users are very close to each other in terms of their arrival angles. There are six co-located elements in a single Triple-COLD element, which provide six polarization degrees of freedom with space saving. Array weights are determined directly to minimize the bit error rate (BER) using genetic algorithm (GA) alternate to conjugate gradient (CG) method, using adaptive minimum BER approach, for QPSK modulation scheme. GA is capable of approaching the MBER solution at a lower complexity than CG algorithm.
{"title":"Genetic Algorithm Assisted Dual Diversity Smart Antenna with Triple-COLD Array for QPSK Communication System","authors":"Y. Ravinder, V. Pandharipande","doi":"10.1109/ICEAA.2007.4387404","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387404","url":null,"abstract":"A dual (polarization and spatial) diversity smart antenna using Triple co-centered orthogonal loop and dipole (Triple-COLD) array is presented. It exploits polarization diversity to support more users in spatial diversity scenario when users are very close to each other in terms of their arrival angles. There are six co-located elements in a single Triple-COLD element, which provide six polarization degrees of freedom with space saving. Array weights are determined directly to minimize the bit error rate (BER) using genetic algorithm (GA) alternate to conjugate gradient (CG) method, using adaptive minimum BER approach, for QPSK modulation scheme. GA is capable of approaching the MBER solution at a lower complexity than CG algorithm.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134618838","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387219
M. Lyalinov
The diffraction problems in angular (or wedge-shaped) domains occupy a special place in diffraction theory because of the wide variethi f the rlrtbd rmAthe-in1ticd ideas abd their practical signiificancO to the wave scattering phenomena. The, history Of the topic begins With the pioneen'iig work by A, Sommerfeld of 1896 nd later W as contributed by many scientists. Papers by G.D Malyuzhinets of the 19 30s opened a way to furthei developments, and now the Sommerfeld-Malyuzhnets approach is without clobt, the most efimcrent and Wilely appliahe one, Owing to tbeh local6zation principle the results bised on the Somherfeld Malyu,zhinets method can be exploited by the Geometrical Theory of Diffraction (TTD) or its equivalent versions for construction of the far field asmmptotic solutions in vaiious sitations of the research and engineering practice. The course shoud be of special interest t undergraduate and po stgraduate student, reseachebrs in Waxe-phenomena engilneeiing, phy sics and aplied Mathematics. Basic knowledge. in complex xvariables functions analysis. PD equations add asylLrXmptotic mtielthods is dsitable. Copies ofpresentadon slides will be provided.
{"title":"Sommerfeld - Malyuzhinets Technique in Modern Diffraction Theory","authors":"M. Lyalinov","doi":"10.1109/ICEAA.2007.4387219","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387219","url":null,"abstract":"The diffraction problems in angular (or wedge-shaped) domains occupy a special place in diffraction theory because of the wide variethi f the rlrtbd rmAthe-in1ticd ideas abd their practical signiificancO to the wave scattering phenomena. The, history Of the topic begins With the pioneen'iig work by A, Sommerfeld of 1896 nd later W as contributed by many scientists. Papers by G.D Malyuzhinets of the 19 30s opened a way to furthei developments, and now the Sommerfeld-Malyuzhnets approach is without clobt, the most efimcrent and Wilely appliahe one, Owing to tbeh local6zation principle the results bised on the Somherfeld Malyu,zhinets method can be exploited by the Geometrical Theory of Diffraction (TTD) or its equivalent versions for construction of the far field asmmptotic solutions in vaiious sitations of the research and engineering practice. The course shoud be of special interest t undergraduate and po stgraduate student, reseachebrs in Waxe-phenomena engilneeiing, phy sics and aplied Mathematics. Basic knowledge. in complex xvariables functions analysis. PD equations add asylLrXmptotic mtielthods is dsitable. Copies ofpresentadon slides will be provided.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130765502","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387330
L. Lo Monte, B. Elnour, D. Erricolo
We present a six-dimensional distributed vector sensor for Direction of Arrival estimation applications. A vector sensor should measure all 6 components of the electromagnetic field at the same location. Such sensor is motivated by recent analytical results, showing an improved estimation of the direction of arrival of the signal from a single source. Since the design of a collocated six-dimensional vector sensor is presently a major challenge, we consider a distributed approach for its design. Numerical simulations show that the performance of a distributed vector sensors in a multipath environment is greater than that of classical approaches with scalar arrays.
{"title":"Distributed 6D Vector Antennas Design for Direction of Arrival Applications","authors":"L. Lo Monte, B. Elnour, D. Erricolo","doi":"10.1109/ICEAA.2007.4387330","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387330","url":null,"abstract":"We present a six-dimensional distributed vector sensor for Direction of Arrival estimation applications. A vector sensor should measure all 6 components of the electromagnetic field at the same location. Such sensor is motivated by recent analytical results, showing an improved estimation of the direction of arrival of the signal from a single source. Since the design of a collocated six-dimensional vector sensor is presently a major challenge, we consider a distributed approach for its design. Numerical simulations show that the performance of a distributed vector sensors in a multipath environment is greater than that of classical approaches with scalar arrays.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130992005","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387397
E. Winebrand, A. Boag
A multilevel direct solver algorithm for scattering from quasi-planar structures is presented. The algorithm comprises matrix compression based on the non-uniform grid (NG) approach. The algorithm attains O(N1.5) complexity, N being the number of unknowns.
{"title":"A Fast Direct Solver for Scattering from Quasi-Planar Geometries Using the Non-Uniform Grid Approach","authors":"E. Winebrand, A. Boag","doi":"10.1109/ICEAA.2007.4387397","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387397","url":null,"abstract":"A multilevel direct solver algorithm for scattering from quasi-planar structures is presented. The algorithm comprises matrix compression based on the non-uniform grid (NG) approach. The algorithm attains O(N1.5) complexity, N being the number of unknowns.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":" 48","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132187789","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387429
G. Mumcu, M. Valerio, K. Sertel, J. Volakis
We outline a fabrication and characterization process for composite materials exhibiting uniaxial anisotropy. Our proof-of-concept sample consists of alternating layers of high-contrast homogeneous dielectrics. We describe a finite element-based cavity measurement method to accurately characterize effects of adhesive loss in these assembled samples. In the latter half of the paper, we introduce a genetic optimization algorithm to design fairly complex composite material textures exhibiting unique field characteristics and dispersion. We conclude by proposing a methodology to design and fabricate metamaterial textures made of commercially available homogeneous ingredients. The automated design process is conjugated by automated fabrication of these designs using advanced material processing techniques such as low temperature co-fired ceramic processing, inkjet material printing, and robo-casting.
{"title":"Applications of the Finite Element Method to Designing Composite Metamaterials","authors":"G. Mumcu, M. Valerio, K. Sertel, J. Volakis","doi":"10.1109/ICEAA.2007.4387429","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387429","url":null,"abstract":"We outline a fabrication and characterization process for composite materials exhibiting uniaxial anisotropy. Our proof-of-concept sample consists of alternating layers of high-contrast homogeneous dielectrics. We describe a finite element-based cavity measurement method to accurately characterize effects of adhesive loss in these assembled samples. In the latter half of the paper, we introduce a genetic optimization algorithm to design fairly complex composite material textures exhibiting unique field characteristics and dispersion. We conclude by proposing a methodology to design and fabricate metamaterial textures made of commercially available homogeneous ingredients. The automated design process is conjugated by automated fabrication of these designs using advanced material processing techniques such as low temperature co-fired ceramic processing, inkjet material printing, and robo-casting.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132489554","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387480
M. Giamalaki, I. Karanasiou, N. Uzunoglu
A non-invasive imaging system, consisting of an ellipsoidal conductive cavity and radiometric receivers, designed and constructed in our laboratory the past few years is restudied. A means for further improvement of the ellipsoidal reflector's focusing properties thus its performance is herein investigated. The main differentiating factor of our new approach is that the receiving antenna is more realistically modelled and also covered by two layers of different dielectric properties. The present paper provides details on the electromagnetic theoretical analysis of the problem and presents numerical results for the electric field distribution inside the head model, using two main operating frequencies, namely 0.5GHz and 1.5GHz for four distinct cases. The focusing optimization of the system in terms of spatial accuracy and penetration depth is assessed while the method and results are also separately validated.
{"title":"Enhancement of the Focusing Properties of a Passive Radiometry Imaging System: A Theoretical Electromagnetic Study","authors":"M. Giamalaki, I. Karanasiou, N. Uzunoglu","doi":"10.1109/ICEAA.2007.4387480","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387480","url":null,"abstract":"A non-invasive imaging system, consisting of an ellipsoidal conductive cavity and radiometric receivers, designed and constructed in our laboratory the past few years is restudied. A means for further improvement of the ellipsoidal reflector's focusing properties thus its performance is herein investigated. The main differentiating factor of our new approach is that the receiving antenna is more realistically modelled and also covered by two layers of different dielectric properties. The present paper provides details on the electromagnetic theoretical analysis of the problem and presents numerical results for the electric field distribution inside the head model, using two main operating frequencies, namely 0.5GHz and 1.5GHz for four distinct cases. The focusing optimization of the system in terms of spatial accuracy and penetration depth is assessed while the method and results are also separately validated.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133104891","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387252
Lin Cheng, B. Henty, D. Stancil, F. Bai, P. Mudalige
We describe a system capable of making channel measurements as a function of location while the vehicles are in motion to study the properties of the vehicle-to-vehicle wireless channel. We present results from on-road experimental tests in suburban areas of Pittsburgh. The dependence of Doppler spread on both velocity and vehicle separation is discussed. We introduce the speed-separation (S-S) diagram as a new tool for understanding and estimating Doppler spread in the vehicle-to-vehicle environment.
{"title":"Properties and Applications of the Suburban Vehicle-to-Vehicle Propagation Channel at 5.9 GHz","authors":"Lin Cheng, B. Henty, D. Stancil, F. Bai, P. Mudalige","doi":"10.1109/ICEAA.2007.4387252","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387252","url":null,"abstract":"We describe a system capable of making channel measurements as a function of location while the vehicles are in motion to study the properties of the vehicle-to-vehicle wireless channel. We present results from on-road experimental tests in suburban areas of Pittsburgh. The dependence of Doppler spread on both velocity and vehicle separation is discussed. We introduce the speed-separation (S-S) diagram as a new tool for understanding and estimating Doppler spread in the vehicle-to-vehicle environment.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131356758","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387356
Z. Raida, J. Lacik, Z. Lukeš
The paper is focused on the multi-objective optimization of multiband antennas. The prescribed frequency response of the reflection coefficient at the antenna input, the maximum gain in the operation bands and the minimum volume of the antenna are the objectives considered in the optimization procedure. Since the wide-band analysis of the multiband antenna is performed in the time domain, the objective functions are composed without frequency domain expressions. That way, an efficient and accurate synthesis tool can be obtained.
{"title":"Multi-Objective Synthesis of Multiband Planar Antennas in Time Domain","authors":"Z. Raida, J. Lacik, Z. Lukeš","doi":"10.1109/ICEAA.2007.4387356","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387356","url":null,"abstract":"The paper is focused on the multi-objective optimization of multiband antennas. The prescribed frequency response of the reflection coefficient at the antenna input, the maximum gain in the operation bands and the minimum volume of the antenna are the objectives considered in the optimization procedure. Since the wide-band analysis of the multiband antenna is performed in the time domain, the objective functions are composed without frequency domain expressions. That way, an efficient and accurate synthesis tool can be obtained.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116364577","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 : 2007-11-21DOI: 10.1109/ICEAA.2007.4387473
R. Fernández-Recio, L. García-Castillo, I. Gómez-Revuelto, M. Salazar-Palma
A convergence study of a non-standard Schwarz domain decomposition method for finite element mesh truncation in electromagnetics has been carried out. The original infinite domain is divided into two overlapping domains. The interior finite domain is modeled by finite elements and the exterior infinite domain by an integral equation representation of the field. A numerical study of the spectrum of the iteration matrix for non-convex mesh truncation boundaries is performed. The projection of the error between two consecutive iterations onto the eigenvector space of the iteration matrix is performed. The numerical results explain the convergence behavior of the Schwarz iterations.
{"title":"Convergence Study of a Non-Standard Schwarz Domain Decomposition Method for Finite Element Mesh Truncation in Electromagnetics","authors":"R. Fernández-Recio, L. García-Castillo, I. Gómez-Revuelto, M. Salazar-Palma","doi":"10.1109/ICEAA.2007.4387473","DOIUrl":"https://doi.org/10.1109/ICEAA.2007.4387473","url":null,"abstract":"A convergence study of a non-standard Schwarz domain decomposition method for finite element mesh truncation in electromagnetics has been carried out. The original infinite domain is divided into two overlapping domains. The interior finite domain is modeled by finite elements and the exterior infinite domain by an integral equation representation of the field. A numerical study of the spectrum of the iteration matrix for non-convex mesh truncation boundaries is performed. The projection of the error between two consecutive iterations onto the eigenvector space of the iteration matrix is performed. The numerical results explain the convergence behavior of the Schwarz iterations.","PeriodicalId":273595,"journal":{"name":"2007 International Conference on Electromagnetics in Advanced Applications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114620124","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：