A Direct Way to Calculate the Inductance of Sandwich Inductor

A method to perform calculation of the inductance of sandwich inductors is presented. In this method, we have divided the total inductance into two parts: self- and mutual inductance brought about by the coreless inductor, and the inductance brought about by the magnetic film. For the self- and mutual inductance, Biot-Savat law is adopted. Through the reluctance magnetic path, the inductance brought about by the magnetic film can be calculated. The formulas also take account of the current density distribution in the coil cross- section, without assuming the current flow in the center of the conductor. And we also compared the calculated and measured values.