Fig. 1
From: Reduction of eddy current losses in inductive transmission systems with ferrite sheets
Functional principle of the ferrite shield. The figure shows the investigated coil configurations with the corresponding magnetic field lines drawn schematically. Air Air-cored coil-system without substrate. Cop The single layer of copper substrate represents a detrimental metallic surface where substantial eddy current losses arise. Fer + Cop An additional ferrite layer is used to minimize the eddy current losses