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为研究双面含孔矩形金属腔体的屏蔽效能问题,运用矢量分解和等效传输线相结合的原理,给出了双面含单孔的矩形金属腔体内部中心点屏蔽效能计算方法,通过与电磁数值软件CST的计算结果对比,验证了该计算方法的有效性,且耗时少、收敛快,运用该方法进一步研究了双面含孔阵矩形金属腔体屏蔽效能,得到了腔体内部多模谐振规律。在共振频率附近,腔体内中心点的耦合电场较强,当频率低于主频谐振时,屏蔽效能随着频率的降低而增大;在2GHz频率范围内,腔体内部各个方向的屏蔽效能都存在多模谐振的现象,且谐振模式不相同;开有相同面积的孔阵屏蔽效能比单孔差,谐振模式变化不大。
In order to study the shielding effectiveness of double-sided rectangular metal cavity with cavity, the method of vector decomposition and equivalent transmission line is used to calculate the shielding effectiveness of double-sided rectangular cavity with single hole. Electromagnetic numerical software CST comparison of the calculated results to verify the effectiveness of the calculation method, and less time-consuming, fast convergence, the use of this method to further study the double-sided aperture array rectangular metal cavity shielding effectiveness obtained inside the cavity Mode resonance law. In the vicinity of the resonance frequency, the coupling electric field at the center of the cavity is strong. When the frequency is lower than the resonance frequency, the shielding effectiveness increases with decreasing frequency. In the frequency range of 2GHz, the shielding effectiveness in all directions in the cavity The phenomenon of multi-mode resonance exists and the resonance modes are not the same. The shielding efficiency of the hole array with the same area is smaller than that of the single-hole mode, and the resonance mode does not change much.