有孔箱体屏蔽效能的多模传输线法分析  

Analysis of a multimode transmission line model of the shielding effectiveness of enclosures with apertures

作　　者：李永明[1] 郑春旭[1] 郝战铎 刘光明 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400044 [2]许继电源有限公司,河南许昌461000 [3]辽宁蒲石河抽水蓄能有限公司,辽宁丹东118216

出　　处：《重庆大学学报（自然科学版）》2011年第10期27-31,共5页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(50877081);重庆市自然科学基金资助项目(CSTC2008BB2311)

摘　　要：通过对有孔箱体屏蔽效能的传输线解析计算法进行扩展,得到可计及箱体内高次模传输的多模传输线模型,运用三维电磁场仿真软件HFSS(high frequency structure simulator)进行了有效性验证。应用得到的多模传输线模型,分析了箱体内不同位置处高次模对屏蔽效能的影响。计算结果表明:宽频域上,高次模对屏蔽效能的影响不可忽略;在1GHz以下,越靠近箱体的开孔,高次模影响越大;在近孔处,高次模会引起某些频段上屏蔽效能的提升。因此,只有综合考虑多种传输模式才能准确反应宽频域上和近孔处的屏蔽效能。The equivalent transmission line method is extended to multi-transverse electric modes of cavity which are introduced by aperture coupling,and it is used to analyze the shielding effectiveness of rectangular enclosures with apertures.The multimode transmission line method is verified by HFSS（High Frequency Structure Simulator）.The results show that higher-order mode is essential to obtain an accurate shielding effectiveness of rectangular enclosure on wide frequency domain.Below the frequency of 1 GHz,nearer to the slot,the impact of higher-order mode on the shielding effectiveness is greater in the place mear the slot.Higher-order mode leads to a better shielding effectiveness.

关 键 词：传输线 多模 孔缝 屏蔽效能 箱体 

分 类 号：TN011[电子电信—物理电子学]