IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450)最新文献

Simulations and measurements of wave propagations in curved road tunnels for signals from GSM base stations GSM基站信号在弯曲道路隧道中的波传播模拟与测量

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2006-09-06 DOI: 10.1109/TAP.2006.880674

Te-Shun Wang, Chang-Fa Yang

引用次数: 31

Studies of the planar inverted-F antenna with a U-shaped slot 带u型槽的平面倒f天线的研究

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-08-11 DOI: 10.1109/APS.2003.1219299

J. Row, C. Hsu, Ching‐Yuan Ai

引用次数: 2

A fully high-order finite-element simulation of scattering by deep cavities 深空腔散射的全高阶有限元模拟

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1219205

Jianming Jin, Jian Lin, Zheng Lou

引用次数: 78

Modelling of a non-isotropic indoor MIMO channel 非各向同性室内MIMO信道的建模

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1219192

Z. Tang, A. Mohan

引用次数: 2

A comparison of particle swarm optimization and genetic algorithms for a phased array synthesis problem 粒子群优化与遗传算法在相控阵综合问题中的比较

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1217430

D. Boeringer, Douglas H. Werner

引用次数: 40

A closely spaced waveguide phased array integrated with a frequency selective surface. Modeling and design 一种具有频率选择表面的紧密间隔波导相控阵。建模与设计

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1219363

S. Monni, N. L. Juan, A. Neto, G. Gerini

引用次数: 4

Kennaugh and the dual space approach to radar polarimetry Kennaugh和雷达偏振测量的双空间方法

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1217432

E. Limeburg, W. Boerner

{"title":"Kennaugh and the dual space approach to radar polarimetry","authors":"E. Limeburg, W. Boerner","doi":"10.1109/APS.2003.1217432","DOIUrl":"https://doi.org/10.1109/APS.2003.1217432","url":null,"abstract":"The paper looks the work of E.M. Kennaugh in the early development of backscatter radar polarimetry. After some remarks on the history of Kennaugh's dual space approach, we discuss time reversal and the voltage equation. The passage from the linear vector space to the dual linear vector space with the corresponding linear form, i.e.. the voltage equation, used extensively by Kennaugh and others, brought radar polarimetry in contact with branches of rather esoteric pure mathematics, namely the geometry of the classical groups and geometric algebra. This theory was already prospering during all of the last century, with numerous interrelations to other fields of mathematics. Many theorems that were considered as new in radar polarimetry actually have a long and important history in their special mathematical context. Many new discoveries in geometric algebra are waiting to be related to the theory of polarimetry as well as to ellipsometry in optics. These remarks do not diminish the achievements and progress made by Kennaugh in the pioneering stages of radar polarimetry, but honor him. He was the first to clear the undergrowth that covered and surrounded early radar polarimetry and opened the door to other points of view that involve interesting, and by far not yet fully exploited, branches of mathematics.","PeriodicalId":173343,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115722714","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}

引用次数: 0

Two-dimensional FDTD inverse-scattering scheme for determination of near-surface material properties 近表面材料特性测定的二维FDTD反散射方法

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1217511

M. Popovic, A. Taflove

{"title":"Two-dimensional FDTD inverse-scattering scheme for determination of near-surface material properties","authors":"M. Popovic, A. Taflove","doi":"10.1109/APS.2003.1217511","DOIUrl":"https://doi.org/10.1109/APS.2003.1217511","url":null,"abstract":"Numerical inverse-scattering studies found in the literature are based on either frequency- or time-domain approaches. Frequency-domain algorithms can result in a very large number of unknown parameters. In contrast. time-domain approaches can exploit causality to limit the region of inversion, potentially reducing the number of unknowns. The most relevant approach to our work is the one-dimensional (1D) FDTD formulation of an inverse-scattering scheme for remote sensing of inhomogeneous lossy layered media (Umashankar, K.R. et al., 1994). A layer-stripping procedure was used to recover the conductivity and permittivity profiles simultaneously, assuming a normally incident plane wave pulse and zero noise present on the received pulse. Our work extends that technique to the case of a two-dimensional (2D) layered lossy half-space impulsively excited at its surface by an infinitely long monopole. The new algorithm permits simultaneous estimation of the electrical permittivity, /spl epsiv//sub r/, and conductivity, /spl sigma/, of a surface layer by generating a search trajectory in the (/spl epsiv//sub r/, /spl sigma/) parameter space of the layer. The robustness of the algorithm is tested in the presence of Gaussian noise. We illustrate our new algorithm by the measurement of the dielectric parameters and skin thickness of the female human breast. Monitoring of near-surface breast properties may be useful for the prediagnosis of underlying tissue pathologies.","PeriodicalId":173343,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116651365","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}

引用次数: 6

Adaptive antenna research at the ElectroScience Laboratory 电子科学实验室的自适应天线研究

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1220342

I. Gupta, S. Ellingson

引用次数: 1

Vector channel coherence in a complex outdoor environment at 2.4 GHz 2.4 GHz复杂室外环境下的矢量信道相干性

IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450) Pub Date : 2003-06-22 DOI: 10.1109/APS.2003.1220157

S. Ellingson

{"title":"Vector channel coherence in a complex outdoor environment at 2.4 GHz","authors":"S. Ellingson","doi":"10.1109/APS.2003.1220157","DOIUrl":"https://doi.org/10.1109/APS.2003.1220157","url":null,"abstract":"Many mobile radio communications systems use a \"frequency division duplex\" (FDD) scheme to separate the reverse link (mobile-to-base) transmissions from the forward link (base-to-mobile) transmissions. FDD poses a difficult problem in the design of forward link smart antenna systems. The performance of such systems is limited by the quality of channel estimates. An often-considered compromise is to estimate the forward link vector channel as the eigenvector associated with the largest eigenvalue of the reverse link spatial covariance matrix R, averaged over many fades. The assumption is that R obtained in this manner represents primarily the path geometry of the channel, which is nominally frequency-independent, while averaging out frequency-selective fading, which is likely to be uncorrelated over the duplex separation in an FDD system. To verify that this is a reasonable assumption, it would be useful to compare direct, simultaneous measurements of the vector channel (that is, the coefficients describing the propagation between each antenna of the base station array and the single mobile antenna) at both the reverse and forward link frequencies in field conditions. This paper presents such measurements, obtained in a complex outdoor environment at 2.4 GHz. It is found that the agreement between the eigenvectors associated with the largest eigenvalue of R at the two frequencies is quite good.","PeriodicalId":173343,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. Digest. Held in conjunction with: USNC/CNC/URSI North American Radio Sci. Meeting (Cat. No.03CH37450)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117126400","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}

引用次数: 0