Lossless multi-way power combining and outphasing for high-frequency resonant inverters

A lossless multi-way power combining and outphasing system has recently been proposed for high-frequency inverters and power amplifiers which offers major performance advantages over traditional approaches. This paper presents a new outphasing control strategy for the proposed system that enables output power control through effective load modulation of the inverters while minimizing loading admittance phase. Moreover, we present the first-ever experimental demonstration of the proposed outphasing system. The design of a 27.12 MHz, four-way power combining and outphasing system is described, and used to experimentally verify the power combiner´s characteristics and evaluate the effectiveness of the proposed outphasing law to control output power over a 10:1 range.