考虑高次模的孔缝腔体屏蔽效能计算方法  

Method for Shielding Effectiveness of Enclosure with Apertures Including High-order Mode

作　　者：高雪莲[1] 马士杰[1] 杨凯 李丹[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《高电压技术》2017年第10期3344-3350,共7页High Voltage Engineering

基　　金：科技部国际合作计划(2011DFR00780);中央高校基本科研业务费专项基金(2015MS03)~~

摘　　要：针对现有孔缝腔体分析方法精度较差的缺点,在模式匹配法基础上,提出一种基于电磁拓扑理论的孔缝腔体屏蔽效能(SE)混合计算方法;该算法能快速准确地计算任意入射、任意极化平面波照射腔体以及任意位置开孔、双面开孔腔体的屏蔽效能。根据模式匹配法将腔体孔缝等效为不连续波导边界,通过求解耦合系数得到孔缝散射矩阵;然后采用电磁拓扑的方法分析孔缝腔体,绘制出物理模型的电磁拓扑信号流图,得到传播关系方程和散射关系方程;最后可获得腔体内任意点处的电压值,从而得到孔缝腔体内部屏蔽效能。通过将理论计算结果与CST仿真结果进行对比,验证了该混合方法在0~2 GHz范围内的计算结果明显优于Robinson等效电路法,且比CST占用的时间短、资源少。The existing analysis method of the seam hole cavity has poor precision,thus we propose a hybrid method for computing the shielding effectiveness（SE） of a cavity with apertures more accurately,based on the mode matching method and the electromagnetic topology theory.The proposed method can quickly and accurately calculate the SE with arbitrary incident and polarized plane wave,and the SE of a cavity with single or double apertures at arbitrary position.According to the pattern matching method,the cavity aperture is equivalent to the discontinuous waveguide boundary,and the scattering matrix of the hole is obtained by solving the coupling coefficient.Then the cavity with aperture will be analyzed by a method of electromagnetic topology,and a propagation relation equation and a scattering relation equation are obtained.At last,the voltage value at any point in the cavity can be obtained,and the shielding effectiveness of the cavity is obtained.By comparing the theoretical results with the CST simulation results,it is shown that the hybrid method is superior to the Robinson equivalent circuit method and has advantages over the CST in running time and memory resource in the range of 0 ～2 GHz.

关 键 词：模式匹配法 电磁拓扑 耦合系数 散射矩阵 屏蔽效能 电磁特性 

分 类 号：TN03[电子电信—物理电子学]