Design of Dual-Band Synchronous Rectifier for High-Power Wireless Power Transmission System

This letter proposes a dual-band synchronous rectifier based on GaN transistors. To improve the efficiency of the rectifier, a dual-frequency phase-shifting network is analyzed based on the positive and negative polarity modes of the rectifier. Then, the phase shift difference between any two frequencies is realized using a phase-shifting structure consisting of L- and T-type networks. A high-efficiency dual-band GaN synchronous rectifier operating at 0.905 and 2.4 GHz is fabricated. In addition, a high-power wireless power transmission experimental system was constructed using horn antennas. The system consists of a dual-band synchronous rectifier, a broadband power amplifier (PA), and a pair of waveguide input-type standard gain horn antennas. Measurement results verify the feasibility of the proposed system.