Mutual coupling analysis of antennas in layered media through equivalent sources for wireless power transfer

In recent years, wireless power transfer has received much attention and been widely studied. Wireless power transfer has many applications. For example, there are the systems that transfer energy wirelessly to an electric car, sensors buried in a wall, devices beyond a wall, and devices in the ground. The one of the modeling method for such systems is to assume that antennas are in layered media and solve the mutual coupling between antennas. In this work, we propose the method for calculating the Z-parameter between antennas in layered media and the maximum power transfer efficiency of a wireless power transfer system.