At RF frequencies, the current in a conductor tends to flow near the surface of that conductor. This is the reason this phenomenon is called skin effect. The result of skin effect is that as frequency increases, RF current flows in a thinner layer of the conductor, closer to the surface. (E5D01)
Because the RF current flows in a smaller cross-sectional area of a conductor than a DC current, the RF current will experience more resistance than a DC current. In other words, the resistance of a conductor is different for RF currents than for direct currents because of skin effect. (E5D02)
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