金属线列横电磁波小室的场分布分析  

Analysis of the field distribution in WTEM cell

作　　者：胡玉生[1] 朱剑英[1] 蒋全兴[2] 

机构地区：[1]南京航空航天大学机电学院 [2]东南大学电磁兼容研究室,江苏南京210096

出　　处：《电波科学学报》2008年第1期6-10,共5页Chinese Journal of Radio Science

基　　金：福建省青年科技人才创新项目(2004J025);集美大学科研基金

摘　　要：金属线列横电磁波(WTEM)小室是一种新型电磁兼容试验设备。对WTEM小室的场分布特性进行了数值分析。采用边界元法分析了WTEM小室的准静态场分布,采用有限元法计算了WTEM室的高次模截止频率,并与TEM小室进行了对比,最后采用时域有限差分(FDTD)法分析了WTEM小室的场均匀性和交叉极化特性。计算结果表明:金属线列的内导体有助于减弱水平方向的高次模;通过金属线列的优化排列可显著扩展可用测试区;场均匀性满足6 dB准则,不过,高于一定频带后交叉极化特性下降,但仍满足放松要求。WTEM小室用于宽频带电磁兼容试验可行。The wire transverse electromagnetic （WTEM） cell is a new equipment for electromagnetic compatibility （EMC） test. The quasi-static field distribution inside WTEM cell is analyzed by boundary-element method, then the higher order mode cutoff frequencies were calculated using finite-element method, and compared with that of transverse electromagnetic （TEM） cell, The field uniformity and cross- polarization performance of WTEM cell are analyzed by three-dimensional finite-difference time-domain （FDTD） method. The numerical results show that the wire array inner conductor can mitigate the horizontal higher-order mode, and the available test volume in which the field uniformity of WTEM cell satisfy the 6 dB criteria can be enlarged through optimizing the arrangement of wire array. Although the cross-polarization performance will degrade over a certain frequency band, it still fulfills the relaxed requirement. The WTEM cell can be used for wide frequency band EMC test.

关 键 词：WTEM小室 数值分析 场均匀性 交叉极化 

分 类 号：TB973[一般工业技术—计量学]