快速预测干扰下斜开孔腔体屏蔽效能的模型  

A Model for Quickly Predicting the Shielding Effectiveness of an Enclosure with an Oblique Aperture Under Interference

作　　者：张晗 李常贤[2] 胡小龙 ZHANG Han;LI Chang-xian;HU Xiao-long(School of Automation and Electrical Engineering,Dalian Jiaotong University,Dalian 116028,China;National and Local Joint Engineering Research Center for Rail Transit Equipment,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学自动化与电气工程学院,大连116028 [2]大连交通大学轨道交通装备国家地方联合工程研究中心,大连116028

出　　处：《微波学报》2023年第3期73-79,84,共8页Journal of Microwaves

摘　　要：提出一种针对复杂干扰下斜开孔金属腔体屏蔽效能的计算模型。该模型可快速精准地计算出任意金属材料腔体,任意开孔位置,任意观测点位置,任意入射、极化平面波照射以及斜开孔阵腔体的屏蔽效能。首先依据磁流原理和镜像原理将斜开孔腔体等效为两个水平开孔腔体,然后基于Robinson的等效电路法分别求解各自的屏蔽效能,再利用公式换算求得斜开孔金属腔体的屏蔽效能。随后针对腔体会面临的不同干扰,给出不同情况下屏蔽效能的计算方法。考虑多种干扰叠加的复杂工况,将该模型利用Matlab进行编程,并将计算结果同全波仿真软件CST中的时域传输线矩阵法和频域有限元法的仿真结果进行对比,验证了所提模型的可行性。该模型在保证计算精度的同时,在计算效率上表现出极大的优势。A calculation method for the shielding effectiveness of an enclosure with an oblique rectangular aperture under complex interference is proposed.This method can quickly and accurately calculate the shielding efficiency of different metal material,off-centered apertures,off-centered observation point position,oblique incidence and polarization and oblique aperture array of enclosures.This enclosure is first decomposed into two ones with horizontal rectangular apertures through mirror image and magnetic flow theories.Then the shielding effectiveness of each decomposed enclosure is solved based on Robinson′s equivalent circuit method.The shielding effectiveness of the metal enclosure with an oblique aperture can be obtained by using the above results to convert through the formula.Finally,the calculation method of shielding effectiveness under different conditions is given for the different interferences that the oblique aperture metal enclosure will face.Considering the complex situation of multiple interference superpositions,by programming the method in Matlab,the results are compared with the simulation results of the time-domain transmission line matrix method and the frequency-domain finite element method in the full-wave simulation software CST.The feasibility of the method in this paper is verified by the comparison results.The method shows great advantages in calculation efficiency while ensuring the calculation accuracy.

关 键 词：屏蔽效能 斜开孔金属腔体 等效电路法 电磁兼容 

分 类 号：TN03[电子电信—物理电子学]