A Study of Misalignment Effects for High-Frequency Wireless Power Transfer Systems Using a Novel Equivalent Transmission Line Model

This paper proposes a misalignment study between transmitting (TX) and receiving (RX) antennas based on a bi-characteristic-impedance transmission line (BCITL) in wireless power transfer (WPT) systems. A pair of rectangular loop coils is designed to operate at 6.78 MHz, where it is placed side by side in a horizontal direction. In addition, the antenna characteristics at each misalignment position are computed, including the power transfer efficiency (PTE). It is shown that the PTE calculation of the WPT system based on scattering and BCITL parameters are in excellent agreement.