不同形状孔阵屏蔽效应的分析

 屏蔽效应的研究对于防御电磁干扰，保证电子系统的正常工作是非常重要的。计算了屏蔽腔上开有不同形状的孔阵时对屏蔽效应的影响，分析比较了各种不同孔间距对屏蔽效应的影响。计算结果表明，圆形孔阵的穿透系数最小，方形孔阵次之，蜂巢形孔阵较大，但频谱分布基本一致。而对于哑铃形孔阵，由于孔面形状差异较大，孔面处磁流分布变化也较大，不仅穿透系数比前三者都大，而且高频时穿透系数的频率分布也发生较大改变。另外，随着孔阵中孔间距变大，孔之间的互耦减弱，耦合进屏蔽腔内的场强也变小。

Analysis on shielding effectiveness of aperture arrays with different shapes

It is important to study the shielding effectiveness to reduce the electromagnetic interference and to protect electronic components. In this paper the shielding effectiveness of aperture arrays on different shapes is calculated and analyzed. The effects of the spaces between the adjacent apertures are analyzed. The results show that the penetration coefficient (PC) of a circle aperture array is the smallest, the one of a square aperture array is medium, and the one of a honey aperture array is the biggest, but their spectrums are almost the same. While for a dumbbell aperture array, because the contour shape is very different with the former aperture arrays, its magnetic current distribution is very different with the other’s. Thus the PC of a dumbbell aperture array is bigger than the ones of the former three others, and the PC’s spectrum at high frequency is also changed a lot. In addition, when the space between the apertures adds, the mutual coupling between the apertures becomes week, and the field coupled into the shielding enclosure also becomes small.