IEEE Antennas and Propagation Society International Symposium 1997. Digest最新文献_第3页

Path loss characteristics in the OOS regions of urban microcellular environments 城市微蜂窝环境OOS区域路径损耗特征

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631730

Z. Yun, K. Tsang

引用次数: 1

On the power absorbed by an electric dipole just above a conducting half space 电偶极子在导电半空间上方所吸收的能量

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.630131

J. Wait

引用次数: 3

Optimum design of N sheet capactive Jaumann absorber using genetic algorithm 基于遗传算法的N片电容式jaaumann吸收体优化设计

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.625428

A. Cheldavi, M. Kamarei

{"title":"Optimum design of N sheet capactive Jaumann absorber using genetic algorithm","authors":"A. Cheldavi, M. Kamarei","doi":"10.1109/APS.1997.625428","DOIUrl":"https://doi.org/10.1109/APS.1997.625428","url":null,"abstract":"An optimum design for N(arbitrary)-sheet capacitive Jaumann electromagnetic (EM) wave absorber, using the genetic algorithm is presented. This algorithm is a random optimization method. We show the bandwidth for two-sheet capacity Jaumann absorber can be expanded even more than 108% as showed by Knott (see IEEE Trans.AP, vol.43, no.11, 1995), by using this algorithm and without imposing the double-notch design criteria. We also show that our results approaches Knott's results when we restrict the characteristic impedances and lengths of the lines to vary within a very short range. We also design one-sheet and three-sheet capacitive Jaumann absorbers. Finally we obtain a 20-dB attenuation bandwidth of more than 145% for one-sheet, 173% for two-sheet and 193% for three-sheet capacitive Jaumann EM absorbers, with some acceptable short range for the variables. We design the one-sheet and two-sheet capacitive Jaumann absorbers at low frequency and the three-sheet at high frequency. The 20-dB attenuation bandwidth obtained for the one-sheet and two-sheet capacitive Jaumann absorbers are respectively, from 10 to 77 MHz and, from 4 to 61 MHz. For the three-sheet capacitive Jaumann absorber the 20-dB attenuation bandwidth obtained is from 0.8 GHz to 280 GHz.","PeriodicalId":283897,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1997. Digest","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128249449","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: 8

Subsurface-scattering calculations via the 3D FDTD method employing PML ABC for layered media 层状介质的三维时域有限差分法亚表面散射计算

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631711

U. Oguz, L. Gurel

引用次数: 8

Luneberg lenses performance limitations due to fabrication process 由于制造工艺的限制，伦伯格透镜的性能受到限制

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631597

P. Ingerson

引用次数: 4

The recursive Green's function method for surface integral equation analysis of inhomogeneous media 非齐次介质表面积分方程分析的递推格林函数法

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.625439

J. Freeze, M. Jensen

引用次数: 3

A thin planar microstrip multibeam antenna system for capacity improvement of cellular radio 一种用于提高蜂窝无线电容量的薄平面微带多波束天线系统

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.625389

A. P. Ansbro, M. Crozzoli, A. Fanigliulo

引用次数: 2

Impedance and polarization characteristics of "H" and "IHI" slot antennas “H”和“IHI”缝隙天线的阻抗和极化特性

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.631712

B. Porter, S. Gearhart

引用次数: 6

A novel narrowband waveguide filter 一种新型窄带波导滤波器

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.625516

O. Asfar

引用次数: 3

Adaptive base station antenna configuration for street microcells considering propagation environment 考虑传播环境的街道微蜂窝基站天线自适应配置

IEEE Antennas and Propagation Society International Symposium 1997. Digest Pub Date : 1997-07-13 DOI: 10.1109/APS.1997.630158

K. Cho, K. Nishimori, T. Hori

{"title":"Adaptive base station antenna configuration for street microcells considering propagation environment","authors":"K. Cho, K. Nishimori, T. Hori","doi":"10.1109/APS.1997.630158","DOIUrl":"https://doi.org/10.1109/APS.1997.630158","url":null,"abstract":"An adaptive beamforming technique is an effective way to combat multipath waves which degrade the transmission quality of high speed wireless communication systems. An antenna using the beamforming technique adaptively directs the nulls of its radiation pattern to the multipath waves. However, it sometimes requires a number of elements to direct the main beam to the desired wave and to nullify the multipath waves. This increases the hardware complexity. This paper proposes a suitable configuration for an adaptive base station antenna employing a fewer number of elements than an conventional antenna array for a street microcell, a typical cell of a microcell mobile communication system. This configuration takes into consideration the propagation characteristics of multipath waves in this typical cell, a street cell. The appropriateness of the proposed configuration is evaluated by a bit error rate (BER) simulation using the measured propagation characteristics. This paper first describes the propagation characteristics of multipath waves measured in a Japanese suburban area. Then the antenna configuration is investigated in terms of the arrangement and element spacing employing omnidirectional elements. Finally, the effectiveness of bidirectional elements is described.","PeriodicalId":283897,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium 1997. Digest","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129105986","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: 2