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从一个开口矩形箱体的模型出发,计算在平面波辐照下从外界耦合到腔体中心的电磁能量。首先根据理想导体表面的边界条件,推导出三维空间散射电磁场的电场积分方程,然后将箱体的表面感应电流使用RWG基函数展开并应用伽略金法进行检验,最后使用矩量法求解表面电流的展开系数得到整个箱体表面的感应电流分布。采用EFIE和FE-KO软件分别计算机箱在单孔、多孔以及圆形孔等不同条件下的屏蔽效能,结果基本一致,并且得知面积相同时,孔洞越多,屏蔽效能越好,且圆形孔比矩形孔屏蔽效能要好。
Starting from a model of an open rectangular box, the electromagnetic energy coupled from the outside to the center of the cavity under the irradiation of a plane wave is calculated. Firstly, the electric field integral equation of three-dimensional space scattering electromagnetic field is deduced according to the boundary condition of the ideal conductor surface. Then, the surface induced current of the box body is developed using RWG basis function and verified by using the Galerkin method. Finally, the surface current The expansion coefficient of the entire box surface induced current distribution. Using EFIE and FE-KO software to calculate the shielding effectiveness of the box under different conditions of single hole, porous and circular holes, the results are basically the same, and that the same area, the more holes, the better the shielding effectiveness, and circular Hole is better than rectangular hole shielding effectiveness.