偏心孔缝箱体屏蔽效能电磁拓扑分析算法  

Electromagnetic topology algorithm of shielding effectiveness analysis of a metallic enclosure with off-centre 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,陕西西安710077

出　　处：《电波科学学报》2014年第5期994-1002,共9页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(No.61271100;No.61271250);陕西省自然科学基础研究重点资助项目(No.2010JZ010)

摘　　要：基于电磁拓扑理论,对Robinson等效电路模型进行改进,提出了箱体屏蔽效能分析的电磁拓扑算法.该算法将孔缝等效为二端口网络,通过散射矩阵准确地描述了箱体内部场的行驻波态,实现了内外场耦合的准确建模;结合偏心孔缝箱体分析理论,求解偏心孔缝散射矩阵,进而实现了偏心孔缝箱体的屏蔽效能分析.在0~2GHz频域内,分别对偏心单孔和孔阵箱体的屏蔽效能进行了仿真,通过与软件CST数值结果的对比,验证了算法的有效性.最后采用该算法详细分析了孔缝宽度、测试点距离、入射极化角和入射方位角对单孔箱体屏蔽效能的影响.This paper presents an electromagnetic topology algorithm for shielding effectiveness(SE)estimation based on electromagnetic topology theory,which improves Robinson's Equivalent circuit model.In this algorithm,the aperture is represented by a two-port network,and its scattering matrix is used to describe the moving-standing wave in the box,which further establishes an equation of the inside and outside electromagnetic field.Based on the theory used to analyze the enclosure with off-centre apertures,the SE can be calculated through modifying the aperture scattering matrix.The enclosure with off-centre aperture and aperture arrays are simulated and the accuracy of this algorithm is verified during a frequency domain from 0GHz to 2GHz,by comparing with a conventional full-wave simulation tool CST.According to the above simulation,the paper analyzes the effect of the aperture width,the position of observation points,polarization angle and azimuth angle on SE.

关 键 词：电磁拓扑理论 等效电路理论 BLT方程 屏蔽系数 孔缝耦合 

分 类 号：TN03[电子电信—物理电子学]