A Coupler design for high power 2.3 kW WPT using 13.56 MHz

In recent years, Wireless Power Transmission (WPT) has been attracting attention as a means of charging Electric Vehicle (EV). WPT for EV has following three major requests such as high-power transmission at long distance, high transmission efficiency, and miniaturization of antennas. One of the methods for extending the transmission distance and miniaturizing antennas is the use of high frequency 13.56 MHz, which is the Industrial Science Medical (ISM) band. However, the loss of the antenna due to the skin effect and the proximity effect must be considered in the high frequency range. Therefore, in order to reduce AC resistance, an antenna using copper foil for the coil is proposed in this paper. As a result of the experiment, an antenna using copper foil achieved high-efficiency high-power transmission at a transmission distance of 300 mm.