The depth of skin effect for copper, can be calculated using the following formula.
Nominal depth of penetration for a copper conductor (δ) = 6.64 / √f cm
Where f= frequency in Hertz
From Transmission Lines and Networks by Walter C. Johnson, McGraw-Hill 1963 p58.
Note: For PCB using 1 oz/ft2 of copper ( which is 35 um thick), allow for at least 17.5 um for each side of the copper for skin effect to become properly established.
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