How a Shield Works A shield contains or excludes electromagnetic energy by reflecting or absorbing the energy. Whenever EM energy passes from one medium.

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Presentation transcript:

How a Shield Works A shield contains or excludes electromagnetic energy by reflecting or absorbing the energy. Whenever EM energy passes from one medium into another, a portion is reflected, just like light off the surface of water. The energy not reflected at the shield’s surface goes into the shield. Whenever EM energy passes through a conductive material (shield), some of it is absorbed. Absorption occurs in the shield. A very small amount of EM energy does not get reflected or absorbed. This is the transmitted energy.