屏蔽是一种抑制干扰的有效技术。众所周知,将一块能导电的板放在两点之间,就会减少它们之间的电能耦合。这种简单的屏蔽在某些应用方面效果很好,但在其他方面效果却很差。在某些场合,把屏蔽物接地能改善屏蔽效果,而在其他场合,这起不了什么作用。因此,如果要设计足够好的屏蔽物,我们就必须懂得屏蔽理论的一些知识。要削弱近场(E和H)以及辐射场或远场, Shielding is an effective technique to suppress interference. As we all know, placing an electrically conductive plate between two points reduces the electrical coupling between them. This simple shield works well for some applications, but is otherwise ineffective. In some cases, grounding the shield improves the shielding, and on other occasions this does not work. Therefore, if we want to design a sufficiently good shield, we must understand some of the masking theory. To weaken the near-field (E and H) as well as the radiation or far-field,