非完全密封金属板电磁屏蔽方法分析

Analysis of Electromagnetic Shielding with a Incompletely Sealed Metal Plane

防止电磁泄漏的屏蔽机柜往往因某些需要如板间接缝、开关孔、线缆孔、散热孔、仪表以及机械接头等,使屏蔽机柜带有缝隙(孔隙),这样,缝隙(孔隙)的电磁泄漏就会降低总的屏蔽效能。文中对非完全密封金属板的电磁屏蔽效能进行计算及分析,并给出一些有效方法与建议。

To prevent electromagnetic field from leaking out of usually shielded cabinet often fails because of some requirements such as the connection of planes, switch holes, cable connector holes, heat dipssipation holes, meter openings and machanical connections make the shielded machine cabinet have slots （holes）. Thus, the electromagnetic leak of the slot （hole） will lower the shielding effect. This paper suggests mainly some effective methods to ~eal completely the metal holes and carries out the calculation and analysis of the shielding performance for incomplete shielded metal planes.