A phase‐shifterless experimental scheme for power combination of two magnetrons utilizing a single RF power amplifier

Abstract

Various coherent power combining schemes have been developed with high power magnetrons to meet the increasing industrial demands of HPM and Wireless Power Transfer applications.In this paper, we propose a power combining scheme for two 1.25 kW magnetrons, based on phase‐shifter less philosophy. The proposed scheme utilizes a single signal generator synthesizing the injection signal for both magnetrons. A single RF Power Amplifier (PA) amplifies the injection signal for both magnetrons to the power level required by Adler's criteria. The amplified signal is then divided by 2:1 RF power divider. The divided signals are subsequently used for injection locking of both magnetrons through same length coaxial cables. The output power of the two magnetrons is combined in a symmetric H‐plane T‐combiner. Since both magnetrons follow the phase of a common injection source the instantaneous phase deviation in their injection‐locked responses is minimal, leading to a combining efficiency of 95%.