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Why high frequency inductors usually use multiple insulated wires _ inductor coil _ electromagnetic coil

Why do high frequency inductors usually use multiple insulated wires?
When the alternating current passes through the conductor, the current density of each part is not uniform, the current density inside the conductor is small, and the current density of the conductor is large. This phenomenon is called the skin effect.
The higher the frequency of the alternating current, the more pronounced the skin effect, the higher the frequency, and the ability to flow completely through the outer surface of the conductor. Therefore, in the high-frequency AC circuit, it is necessary to consider the effect of the skin effect. For example, the coil on the radio antenna of the radio is wound with a plurality of insulated wires, and the outdoor antenna of the TV is made of a metal tube having a relatively large diameter without using a metal rod. They are all examples of adding the outer surface of the conductor to overcome the effects of the helium effect caused by the skin effect.

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