带缝隙腔体电磁屏蔽特性的数值模拟研究  

Numerical simulation on the electromagnetic shielding performance of enclosure with slots

作　　者：吴贤[1] 杜平安[1] 聂宝林[1] 毛湘宇[1] 

机构地区：[1]电子科技大学机械电子工程学院,四川成都611731

出　　处：《工程设计学报》2011年第3期197-203,共7页Chinese Journal of Engineering Design

基　　金："十一五"总装预先研究基金资助项目(YG060101C)

摘　　要：电子设备因散热需要,其腔体表面会存在大量孔缝,而孔缝又是造成电磁泄露的重要途径,其中更以缝隙的影响最为严重.由此,以带缝隙的金属矩形腔体为对象,应用时域传输线矩阵法(transmission-line matrix method,TLM),研究了平面波的极化方式及入射角,缝隙的长度、数量、位置、间距及方位等对腔体屏蔽特性的影响,得到了影响腔体屏蔽特性的主要因素.其中,平面波的极化方式、缝隙的长度和方位会对腔体的屏蔽效能和谐振点产生显著的影响,在屏蔽设计中,应尽量避免干扰源的电场方向与缝隙长边垂直及缝隙过长.Large number of apertures and slots are usually inevitably presented in actual enclosure of electronic equipment due to heat dissipation purpose.However,the penetration of electromagnetic energy leaking though apertures,especially slots,will compromise the shielding performance remarkably.Then,a metallic rectangular enclosure with slots was studied,and the influence of polarization mode and angles of incidence plane wave,parameters of slots such as length,quantity,location,space and orientation on the shielding performance of the enclosure were investigated by the transmission-line matrix method（TLM）.Finally,the main factors determining the shielding performance of the enclosure were proposed.The polarization mode of plane wave,length and orientation of slots has significant influence on the shielding effectiveness and resonance points of the enclosure.The electric field orientation of incidence wave should avoid being vertical with longer sides of slots,and slots shouldn＇t be lengthy in structure shielding design.

关 键 词：缝隙 传输线矩阵法 平面波 电磁屏蔽特性 屏蔽效能 谐振点 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]