IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)最新文献_第8页

Optical SCM transmission multiplexing IF and local signals for adaptive array 光单片机传输多路中频和本地信号用于自适应阵列

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.960071

O. Shibata, I. Seto, S. Obayashi, H. Shoki

{"title":"Optical SCM transmission multiplexing IF and local signals for adaptive array","authors":"O. Shibata, I. Seto, S. Obayashi, H. Shoki","doi":"10.1109/APS.2001.960071","DOIUrl":"https://doi.org/10.1109/APS.2001.960071","url":null,"abstract":"There has been much interest in the application of adaptive array antennas to wireless communication systems. To keep base station (BS) requirements simple, it is advantageous to separate the array antenna in a BS from a signal processing unit in a central station (CS) and link them by optical fiber. Several approaches have been proposed. In these approaches, due to ambient temperature changes, phase differences among antenna branches cannot be kept constant between a CS and a BS so that the antenna radiation pattern changes. We introduce a new configuration for optical subcarrier multiplexing (SCM) radio-on-fiber (ROF) transmission, which can avoid the above difficulties. In this system, the SCM signal comprises all antenna branch signals and all local signals for original frequency conversions. While the proposed system is simple, the phase difference among antenna branches can be maintained to be constant in spite of fiber length fluctuation. Furthermore, only a pair of optical transceivers and optical fibers for downstream and upstream lines is required between a CS and a BS. We show the results of several experimental investigations.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115351824","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

Inductive magnetic currents and radiation characteristics of planar and linear arrays: analysis of resembling behaviours 平面和线性阵列的感应磁流和辐射特性:相似行为的分析

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.960226

Jian-ying Li, Lewei Li, B. Ooi, P. Kooi, M. Leong

引用次数: 0

HIRF penetration into a fuselage-like body: FDTD predictions vs. measurements 高频辐射穿透类机身:时域有限差分预测与测量

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.960151

C. Birtcher, S. Georgakopoulos, C. Balanis

{"title":"HIRF penetration into a fuselage-like body: FDTD predictions vs. measurements","authors":"C. Birtcher, S. Georgakopoulos, C. Balanis","doi":"10.1109/APS.2001.960151","DOIUrl":"https://doi.org/10.1109/APS.2001.960151","url":null,"abstract":"The ability of the finite-difference time-domain (FDTD) method to readily handle complex structures having a complex mix of materials makes it suitable for predicting the penetration of high intensity radiated fields (HIRF) fields into aircraft fuselages. This paper summarizes the next step in ASU's on-going research into developing the computational tools that are needed to predict this HIRF penetration. The shielding effectiveness, a measure of field penetration, of a 1:20 scaled simplified aircraft fuselage was predicted using the FDTD method and was compared with measurements. To accelerate the FDTD solution of this relatively high-Q structure, a resistive source model was used, and the time-domain fields were windowed prior to Fourier transformation into the frequency domain. A reasonable level of agreement was observed between measurement and prediction at the lower frequencies of the 0.25 GHz to 9 GHz band considered. At the higher frequencies, the measurement and prediction are not in close agreement, deterministically. However, the envelope of the predicted shielding effectiveness continues to compare favorably at the higher frequencies with that measured, suggesting that a statistical approach may be appropriate.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124266668","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: 4

Topological asymptotic for waveguide optimization 波导优化的拓扑渐近

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.958929

P. Mader, M. Masmoudi, C. Mangenot

引用次数: 10

Experimental study of broadband dual-frequency circular patch antennas 宽带双频圆形贴片天线的实验研究

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.959405

Jui-Han Lu

引用次数: 0

A new algorithm for the reconstruction of band-pass signals 一种新的带通信号重构算法

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.958850

A. Ramadan, A. Omar

引用次数: 1

A novel pseudospectral technique based method of lines for planar circuits 一种基于伪谱技术的平面电路线形方法

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.959849

R. Chen, E. Yung, K. Tsang

{"title":"A novel pseudospectral technique based method of lines for planar circuits","authors":"R. Chen, E. Yung, K. Tsang","doi":"10.1109/APS.2001.959849","DOIUrl":"https://doi.org/10.1109/APS.2001.959849","url":null,"abstract":"Full-wave electromagnetic modelling of MIC/MMIC is required for efficient and accurate circuit analysis and design. Spectral-domain analysis (SDA) has been utilized frequently in the past but the application is virtually limited to cases where the circuit fits into an orthogonal coordinate system. For the analysis of arbitrarily shaped transmission line discontinuities, finite element/finite difference type methods (FEM/FDM) and transmission line matrix (TLM) method offer a high degree of flexibility. The need for large computer memory and supercomputer power is the main hurdle in implementing these methods. A technique with some potential to overcome these problems is method of lines (MOL). However, discretizing two spatial variables in a circuit that contains fine details requires a large number of lines and again leads to computer-time-intensive algorithms. To eliminate the shortcomings of the conventional MOL and take advantage of the attractive features of SDA, a combination of the two methods, the pseudospectral based method of lines, is developed for the analysis of arbitrarily shaped spatial 3D planar MIC/MMIC. For this application, the pseudospectral based method of lines is numerically very efficient, since most of the unfavorable properties commonly encountered with either SDA or MOL are avoided. The resonant frequency of a microstrip resonator dominant mode is analyzed.","PeriodicalId":159827,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116046853","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: 1

A new design of frequency invariant beamformers 一种新的频率不变波束形成器设计

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.959760

Q. Zeng, D. O'Shaughnessy

引用次数: 0

Analysis of leakage in multilayered microstrip lines using complex images 基于复杂图像的多层微带线泄漏分析

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.959790

J. Bernal, F. Mesa, F. Medina

引用次数: 0

Analysis of bandwidth and radiation in non-centered stacked patches 非中心叠片的带宽和辐射分析

IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229) Pub Date : 2001-07-08 DOI: 10.1109/APS.2001.958802

E. Rajo-Iglesias, G. Villaseca-Sanchez, C. Martín-Pascual

引用次数: 4