Circuit Modeling of a Wireless Power Transfer System Containing Ferrite Shields Using an Extended Impedance Expansion Method

The impedance expansion method (IEM) is a circuit modeling technique based on the method of moments (MoM). This study extended the conventional IEM to be applied to wireless power transfer (WPT) systems containing dielectric/magnetic (DM) bodies such as ferrites. The advantages of the extended IEM are that it can consider arbitrarily shaped DM bodies, self-resonant coils, and radiation loss, and t...