An efficient analytical method has been proposed for predicting the shielding effectiveness (SE) and resonances of a metallic enclosure with multiple apertures against an external incident plane wave. First, the electromagnetic (EM) field distribution within the enclosure through multiple apertures is represented by the equivalent electric and magnetic dipole moments based on the Bethe’s theory for small aperture coupling. Then, the EM fields in the enclosure can be obtained by using the scalar wave functions, where the unknown coefficients in the functions are related to the equivalent dipole moments. Finally, the analytical method is applied to handle the enclosure with multiple apertures, and corresponding inclusions about the SE and resonances can be obtained. Compared with the full-wave simulation software CST over the frequency range of 0–2.5 GHz, the analytical method is proved to be accurate and effective, which consumes less time than the conventional numerical methods.

已经提出了一种有效的分析方法来预测具有多个孔的金属外壳对外部入射平面波的屏蔽效果（SE）和共振。首先，通过基于小孔耦合的贝特理论的等效电和磁偶极矩来表示通过多个孔在罩内的电磁（EM）场分布。然后，可以通过使用标量波函数获得外壳中的EM场，其中函数中的未知系数与等效偶极矩有关。最后，将分析方法应用于处理具有多个孔的外壳，并且可以获得关于SE和共振的相应内含物。与全波仿真软件CST在0–2频率范围内的比较。