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Skin Effect

refers to the phenomena whereby the signal traveling through a conductor will be conducted only on the outer surface (skin) of the wire as the frequency increases. At lower frequencies the current travels through the entire cross section of the conductor. As the frequency increases, the current only travels nearer the outer surface of the conductor. The thickness of this "skin" scales as 1/√f, where f = frequency. At 1 GHz the signal travels only on the outer 2 microns (0.00008 inches) of a copper wire.