DESIGN OF HIGH-FREQUENCY INDUCTORS BASED ON MAGNETIC-FILMS

Magnetically coated stripe inductors with the conductor insulated from the magnetic film and with the conductor in direct electrical contact with the magnetic film are analyzed. A simple equivalent circuit mode l shows that for the structure without insulation, regardless of the f act that the de resistivity of the magnetic film is much higher than t hat of the conductor, most of the driving current flows in the magneti c film at frequencies where the impedance of the device is dominated b y inductance, i. e., where the quality factor Q>1. This effect of curr ent re-distribution significantly lowers the performance of the device . A design is proposed having insulation layers to avoid current flow in the magnetic film, which is broken up in sections along the conduct or stripe to avoid displacement currents in the system.