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A plane wave in free space is normally incident on a thin copper sheet of thickness t. What is the approximate required thickness if

A plane wave in free space is normally incident on a thin copper sheet of thickness t. What is the approximate required thickness if the copper sheet is to be used as a shield to reduce the level of the transmitted electric field by 90DB? Make a chart and do this calculation for f=1MHZ, 1GHZ, and 100GHZ. Simplify the problem by ignoring the reflection at the interfaces.

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