As a way of reducing proximity effect and parasitic capacitance, RF
coils are created to not have several turns that are lying close and parallel
to each other. RF coils have windings that are usually wound on a single layer,
with turns spaced apart. In order to diminish resistance because of skin
effect, the windings in an RF inductor may be made of metal with a larger silver-plated
surface area.
https://www.futureelectronics.com/c/passives/inductors--rf-inductors/products
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