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Define shielding effectiveness. How can this be measured and the result be expressed
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Electromagnetic shielding is the technique that reduces the coupling of undesired electromagnetic energy into equipment so that to enable it to operate compatibility in its electromagnetic environment.

A electromagnetic wave is incident on the barrier. Thus a reflected wave is produced, and a portion of incident wave is transmitted through the barrier. Thus the shielding effectiveness of the barrier is defined for the electric field in decibels as shown below:-

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