RF Power Amplifier Design for Wireless Power Transfer Using Method of Moment

Power Amplifier is an essential part of wireless power transfer system. To comprehensively investigate the wireless power transfer using mid-range resonant coupling (Witricity) over a wide range of frequencies, the analysis and design of a RF power amplifier covering a broadband of 2-30MHz are presented. The power amplifier works in class AB mode to achieve both the high efficiency and high rated output power. The amplifier features a configuration of multilayer media. In this aspect, method of moment (MOM) is employed to analyze the amplifier for its exclusive advantage in modeling multilayer medium problems. A prototype amplifier, operating at an output power of more than 50 W with PAE of more than 45% over the frequency band of 2-20 MHz, is fabricated and tested. The experimental results show good agreement with the simulated ones, demonstrating the feasibility of the proposed work.