孔缝箱体屏蔽效能电磁拓扑分析模型  

Electromagnetic topology model for shielding effectiveness estimation of metallic enclosure with apertures

作　　者：张亚普[1] 达新宇[1] 谢铁城[1] 

机构地区：[1]空军工程大学信息与导航学院,西安710077

出　　处：《强激光与粒子束》2014年第2期228-233,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(61271250)

摘　　要：基于Robinson等效电路法,提出了一种电磁拓扑模型,用于任意平面波入射条件下的孔缝箱体屏蔽效能分析。该模型将孔缝及其所在平面等效为连接自由空间(等效为特性阻抗为Z0的传输线)和剩余箱体(等效为特性阻抗为Zg的短路矩形波导)的二端口网络,并通过等效电路模型计算了该二端口网络的散射矩阵,进而推导出描述孔缝耦合的广义BLT(Baum-Liu-Tesche)方程。设计了4组实验模型用于电磁拓扑理论(EMT)算法、Robinson算法和CST软件的对比分析,仿真结果证明:EMT算法较Robinson算法具有更高的准确率,尤其是在高频域;EMT算法继承了Robinson算法简洁高效的特性,且能直观反映箱体参数、孔逢参数对屏蔽系数的影响,较CST软件实用性更强。This paper presents an electromagnetic topology model for shielding effectiveness estimation, considering oblique incidence and polarization, based on Robinson equivalent circuit theory. In this model, the apertures are represented by a two-port network, which connects the free space （represented by a transmission line with characteristic impedance Z0 ） and the enclosure （represented by a short circuited length of rectangular waveguide）. The aperture scattering matrix is deduced by equivalent circuit model, based on which a new generalized BLT equation for aperture coupling is proposed. Four test models are designed for the comparison of the EMT algorithm, Robinson algorithm and CST. The simulation result shows that, the EMT algorithm is more accurate than the Robinson algorithm, especially in the high frequency domain; while it is as concise as the Robinson algorithm, and establishes the relationship between shielding effectiveness and parameters of enclosure and apertures, which makes it more practical than CST.

关 键 词：电磁拓扑理论 BLT方程 屏蔽系数 电磁耦合 传输线 

分 类 号：TM15[电气工程—电工理论与新技术] TN011[电子电信—物理电子学]