装有电路板孔阵矩形腔对快上升前沿电磁脉冲的屏蔽效能

 介绍了快上升前沿电磁脉冲的特性,用传输线法分析了孔阵矩形腔屏蔽效能的基本原理。将基本公式作进一步修正，使其能计算矩形腔内装有印刷电路板（PCB）的情形。对修正的传输线模型计算公式进行了扩展，使之能计算任意极化方向时的情况。计算和仿真结果表明: 当频率低于主谐振频率时，测量点离孔阵越近，屏蔽效能越差，同时低频段的屏蔽效能比高频段的要好；孔阵的屏蔽效能比相同面积单孔的要好；装有PCB腔体的屏蔽效能比空腔的要好，这在谐振区域内尤为突出；PCB板尺寸越大，屏蔽效能越好；屏蔽效能随极化角度的递增而增加；屏蔽体越小，屏蔽效果越好。

Shielding effectiveness of PCB loaded rectangular cavity with aperture arrays to front rising electromagnetic pulse

This paper analyzes the characteristics of the front rising electromagnetic pulse and introduces the basic theory of transmission line method used to analyze shielding effectiveness of rectangular cavity. The basic formulas are then revised to calculate the case when a piece of PCB is set in the rectangular cavity. The revised formulas are expanded to arbitrary angle of polarization. Computation and simulation results indicate that: for a frequency lower than the dominant frequency,the closer the observational site is to the enclosure,the worse the shielding effectiveness is,and the shielding of low frequency is better than that of high frequency;for the same areas,the shielding effectiveness of a single hole is worse than that of an aperture array;in the same conditions,the shielding effectiveness of a PCB loaded enclosure with apertures is better than that of an empty one especially in the resonance frequency bandwidth;the bigger the PCB is,the better the shielding effectiveness is;the shielding effectiveness increases when polarization angle increases,and smaller rectangular cavity has better shielding effectiveness.