Design of a new microwave power combiner based on twenty-way waveguides

From 18 GHz~26.5 GHz, A new microwave spatial power combiner is designed. The device is composed of a multi-step impedance transformer and twenty waveguides. Since the waveguides provide a consistent impedance transformation and a broad band working frequency, a microwave solid-state power amplifier based on the combiner demonstrates an output power of more than 10 W at 26.5 GHz and greater than 15 W over the 22 GHz to 25 GHz band. Measured results show that all the waveguides have the high uniformity of amplitude and phase, and the combiner has demonstrated operation over a broadband of 18 GHz to 26.5 GHz with more than 10 dB return loss and less than 0.5 dB insertion loss.