有孔矩形腔的屏蔽效能及其对谐振抑制研究  

Analysis of shielding effectiveness for rectangular cavity with apertures and resonance suppression

作　　者：汪柳平[1] 高攸纲[1] 

机构地区：[1]北京邮电大学,电信工程学院,北京100876

出　　处：《电波科学学报》2008年第3期560-564,571,共6页Chinese Journal of Radio Science

基　　金：国家高科技发展计划项目(2007AA01Z281)

摘　　要：介绍了用传输线解析计算法分析有孔矩形腔屏蔽效能的基本原理,对基本公式作进一步修正,使其能计算孔阵列情形,并对修正的传输线模型计算公式进行了扩展,使其能计算任意极化方向时的情况。通过在腔体内表面敷设经过优化计算的复合电介质涂层,实现了对特定谐振频率抑制。计算和仿真结果表明:当处于谐振频率时,屏蔽系数很低甚至为负;孔阵的屏蔽效能比相同面积的单孔的屏蔽效能好;屏蔽效能随极化角度增加而变化,当耦合电场极化方向平行孔缝的长边时,屏蔽效果最好;在腔体内表面上敷设对应腔体谐振频率的复合电介质涂层,实现了在相同的厚度条件下对腔体谐振频率最佳的抑制效果。根据计算结果提出了设计屏蔽腔的建议。This article first introduces the basic theory of transmission line method, which is used to analyze shielding effectiveness of rectangular enclosure with apertures, then expands the fundamental formulas to deal with the cases of multi-holes and polarization with arbitrary angle. Through laying the complexed dielectric coating on internal surface of the cavity, resonance suppression is realized . The result of computing indicates that： under resonant frequency, resonance results in low even negative shielding effectiveness, for the same areas, shielding effectiveness of a single hole is worse than that of multi-ones. Shielding effectiveness varies as polarization angle increases, and it is the best when the coupled field passes through the rectangular aperture with the long side parallel to the polarization. By laying the complexed dielectric coating of optimized calculation on internal surface of the cavity, the best result of resonance suppression can be realized under the same thickness of the coating. According to the result of calculation, some suggestion measures of shielding are proposed in this paper.

关 键 词：传输线法 孔缝 谐振频率的抑制 屏蔽效能 

分 类 号：O441[理学—电磁学]