Proposal of inverse Doherty rectifier tolerant of DC load fluctuation

This paper presents a novel RF rectifier that compresses RF input impedance fluctuation caused by DC load change for reducing return loss at RF input power. The proposed rectifier connects twin basic RF rectifiers and a quarter-wave impedance transformer. The proposed rectifier automatically switches the two rectifiers according to DC load resistance. As the result, the rectifier can keep low deviation of RF input impedance. This paper formulates the RF input impedance behavior and verifies its formula by circuit simulation.