A new spatial power combiner based on 32-way ridged waveguides

This paper presents a new spatial power combiner based on millimeter wave broadband multi-way ridged waveguides. The device is composed of a multi-step impedance transformer and 32-way ridged waveguides. Since the ridged waveguides provide a consistent impedance transformation and a broad band working frequency, a millimeter wave solid-state power amplifier based on the combiner demonstrates an output power of more than 34.6 dBm at 60 GHz and greater than 35 dBm over 49 GHz to 59 GHz band. Measured results show that all the ridged waveguides have the high uniformity of amplitude and phase, and the combiner has demonstrated operation over a broadband of 47 GHz to 60 GHz with more than 8 dB return loss and less than 0.8 dB insertion loss.