Design of compact power combiner in rectangular waveguide

This paper introduces a type of microwave source based on power combining of conventional klystrons and pulse compression. In order to achieve power combing of two high peak power klystrons, a compact planar power combiner was designed. The reflection losses of each ports and the isolation of opposite ports are both more than 45 dB at 2.856 GHz. Combining two 50 MW microwaves, the max surface field of four-port power combiner is about 9.6 MV/m, and the power combing efficiency is more than 99%. A type of eight-port combiner was realized based on two-stage combining of the four-port power combiner, when combining four 50 MW microwaves, the max surface field of the eight-port power combiner is about 13.5 MV/m.