Wide power range operable 3-stage S-band microwave rectifier with automatic selector based on input power level

This research proposes a wide power range operable 3-stage microwave rectifier for microwave wireless power transfer systems. The proposed rectifier is fabricated and measured at S-band. The proposed rectifier system consists of three rectifiers which has different operational range. Also, the system automatically selects the appropriate rectifier based on input power level. The rectifiers utilize HEMT instead of conventional schottky diodes for future integration into MMIC of wireless communication system. We have confirmed the system has over 30dB range of input power with efficiency of over 25%. The concept of the system is effective for future microwave wireless power transfer system.