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A shielding enclosure with no apertures has a shielding


A shielding enclosure with no apertures has a shielding effectiveness of 100 dB at 100 MHz. Determine the shielding effectiveness of the enclosure, at 100 MHz and at 200 MHz, if 20 closely spaced, equal size apertures were cut into one of its panels. Each of the apertures would have a  maximum dimension of 3 cm.

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Physics: A shielding enclosure with no apertures has a shielding
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In this problem the shielding effectiveness is determined and in this case the absorption loss plays an important role in the overall shielding effectiveness. Generally at low frequencies close to a magnetic field source, the wave impedance is low and therefore the reflection loss due to conductive shields is less significant.

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