X-band wireless power transfer with two-stage high-efficiency GaN PA/ rectifier

Abstract

A 2-stage X-band GaN MMIC operating as a power amplifier and rectifier is measured in a wireless power transfer link. The PA operates at 9.9 GHz in class-AB and achieves 10W of output power and >20 dB of gain. As a rectifier, the MMIC achieves over 52% RF-DC conversion efficiency at a power level of >8W. In a wireless powering link at a distance of 5 cm, the system achieves 10% DC-DC efficiency. The applications are bi-directional high power directional wireless power transfer (WPT).