IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)最新文献

FDTD modeling of an artificially-synthesized absorbing medium 人工合成吸收介质的时域有限差分模拟

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-12-01 DOI: 10.1109/75.819371

Wenhua Yu, R. Mittra, D. Werner

{"title":"FDTD modeling of an artificially-synthesized absorbing medium","authors":"Wenhua Yu, R. Mittra, D. Werner","doi":"10.1109/75.819371","DOIUrl":"https://doi.org/10.1109/75.819371","url":null,"abstract":"Special attention has been previously given to the study of periodic materials and wave propagation in periodic structures. Of particular interest is the possibility of using these periodic materials to achieve low reflection over a broad frequency band. We present a novel infinite periodic structure comprised of lossy dielectric and magnetic materials in a checkerboard-type configuration. The search for an artificial structure that exhibits a good match to free space was motivated by the fact that, to date, it has not been possible to find a real material which satisfies the criterion /spl epsiv/'/sub r/=/spl mu/'/sub r/ and /spl epsiv/\"/sub r/=/spl mu/\"/sub r/-or similar ones that present a perfect match to the free space-as does the well-known PML medium widely used for the finite difference time domain (FDTD) mesh truncation. The FDTD technique is applied in conjunction with a periodic boundary condition to calculate the scattered field from the periodic structure for normally-incident plane waves. Because the computation is carried out in the time domain, only one FDTD simulation is required to calculate the scattering parameters in the frequency range of interest.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"38 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132722433","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: 17

The design of high-order, leap-frog integrators for Maxwell's equations 麦克斯韦方程组的高阶跨越式积分器设计

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789110

J.L. Young

引用次数: 6

Gain and G/T of reconfigurable active receive antennas-a parametric approach 可重构有源接收天线的增益和G/T参数化方法

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789258

U. Kraft

{"title":"Gain and G/T of reconfigurable active receive antennas-a parametric approach","authors":"U. Kraft","doi":"10.1109/APS.1999.789258","DOIUrl":"https://doi.org/10.1109/APS.1999.789258","url":null,"abstract":"Reconfigurable, active receive antennas are attractive for future aerospace systems since they offer a flexible antenna pattern and permit the high sensitivity reception of very weak signals even at mm-wave frequencies. Such antennas can be realized as direct radiating arrays, single-reflector multi-feed types or array-fed double-reflector antennas (magnified arrays) and comprise-in all cases-a passive radiator section and an active BFN. In order to support the analysis and design of systems using such antennas, a general antenna model covering a wide variety of configurations has already been proposed (Kraft and Blaschke 1997, and Kraft et al.). Based on this model, the current contribution provides a parametric treatment of gain and G/T which uses a smaller number of parameters in order to simplify the establishment of first-cut design and top level requirements for the main assemblies (electronic chains, combiner), and to support the comparison of options and identification of design drivers taking performance changes over the entire reconfiguration range into account.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"518 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123110498","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

Characteristics of 60 GHz band conical beam radial line slot antennas 60 GHz频段锥形波束径向线槽天线特性研究

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.788381

A. Akiyama, J. Hirokawa, M. Ando, E. Takeda, Y. Arai

引用次数: 2

Applications of smart antennas in cellular networks 智能天线在蜂窝网络中的应用

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789504

M. Feuerstein

引用次数: 13

A modified 3D fourth order FDTD algorithm M3d/sub 24/ for improving phase accuracy with low resolution 一种改进的三维四阶FDTD算法M3d/sub 24/，用于提高低分辨率下的相位精度

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789115

H.E. Abd El-Raouf, E.A. El-Diwani, A. El-Hadi Ammar, F.M. El-Hefnaw

引用次数: 4

Downlink propagation measurements in the GSM 900 and 1800 MHz bands GSM 900和1800mhz频段的下行链路传播测量

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.788229

M. Ahlberg, B. Lindmark, J. Simons, C. Beckman

引用次数: 2

Higher-order impedance boundary conditions for complex layered planar coatings 复杂层状平面涂层的高阶阻抗边界条件

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789551

V. Galdi, I. Pinto

{"title":"Higher-order impedance boundary conditions for complex layered planar coatings","authors":"V. Galdi, I. Pinto","doi":"10.1109/APS.1999.789551","DOIUrl":"https://doi.org/10.1109/APS.1999.789551","url":null,"abstract":"The widespread use of complex materials (e.g., bianisotropic, nonreciprocal), in the form of thin coatings on conducting bodies, e.g., in shielding and backscattering reduction/enhancement applications, demands more efficient CAD tools based on effective models. Approximate impedance boundary conditions (IBCs), whenever applicable, can be very helpful in reducing the computational cost of numerical methods. Hoppe and Rahmat-Samii (1995) devised a spectral domain approach for systematically deriving higher-order IBCs (HOIBCs) for piecewise homogeneous coatings with arbitrary constitutive properties on planar and as well as curved metallic boundaries. This approach turns out to be very well suited for CAD implementations, on account of its wide applicability and high accuracy. In this article, we extend the aforementioned method by studying the problem of scattering by an isotropic, longitudinally inhomogeneous, dielectric coating on a general (i.e., polarization-rotating) impedance planar boundary. Such an extension allows an easy handling of multilayer coatings consisting of arbitrarily stacked homogeneous bianisotropic and inhomogeneous dielectric layers.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127307288","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

Relative accuracy of several low-dispersion finite-difference time-domain schemes 几种低色散时域有限差分格式的相对精度

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789108

K. Shlager, J. Schneider

{"title":"Relative accuracy of several low-dispersion finite-difference time-domain schemes","authors":"K. Shlager, J. Schneider","doi":"10.1109/APS.1999.789108","DOIUrl":"https://doi.org/10.1109/APS.1999.789108","url":null,"abstract":"For electrically large problems, the numerical dispersion inherent in the classical Yee finite-difference time-domain (FDTD) algorithm can introduce significant errors. Over the past ten years there have been several FDTD schemes published with the goal of reducing dispersion errors. In this paper, a comparison of the 2-D dispersion error of several of these low-dispersion schemes is made. The accuracy of each FDTD scheme is compared via direct evaluation of the dispersion relation governing the algorithm. In addition, numerical experiments were performed to verify the derived dispersion relations. The algorithms compared include Krumpholz and Katehi's MRTD scheme (1996), Hadi and Piket-May's M24 scheme (1997), Cole's Non-Standard scheme (1997), Forgy's isotropic scheme (1998), Nehrbass, Jetvic and Lee's (NJL) reduced dispersion scheme (1998), and Turkel's Ty(2,4) implicit scheme (1998). The dispersion characteristics are typically derived by assuming a time harmonic plane-wave solution in an isotropic, homogeneous, linear and lossless medium.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125517729","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: 9

Figure of merit for the design of microstrip patch antennas 微带贴片天线设计的优点图

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789312

D. M. Kokotoff, R. Waterhouse, J. Aberle

{"title":"Figure of merit for the design of microstrip patch antennas","authors":"D. M. Kokotoff, R. Waterhouse, J. Aberle","doi":"10.1109/APS.1999.789312","DOIUrl":"https://doi.org/10.1109/APS.1999.789312","url":null,"abstract":"The authors describe the proposed figure of merit and use it to evaluate the relative merit of some specific single layer and stacked patch antennas. The proposed quantity gives the designer an understanding and limit of both the radiation efficiency and achievable impedance bandwidth of the printed antenna. Importantly, the quantity can be determined without the need for a numerically intensive full-wave analysis and can be applied, not only to single layer patches, but stacked geometries as well. The figure of merit is valid for probe-fed, edge-fed and proximity coupled patches. It also holds for aperture coupled patches as long as the slot is not too large. The theory behind this figure of merit is derived for a circular patch geometry, although it can easily be applied to other conductor shapes, such as rectangular or triangular. Results for circular microstrip patches using various materials are provided, including broadband stacked patches and stacked patches utilising high dielectric constant and low dielectric constant material combinations. From the results given it is evident that the derived figure of merit provides a good basis for the design of microstrip patch antennas.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125689962","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: 3