37 W, 75–100 GHz GaN power amplifier

This paper reports the first broadband, high-power solid-state power amplifier operating at W-band (75–110 GHz) frequencies. Utilizing a new broadband GaN MMIC chip, we report a radial combiner that effectively combines 24 of these MMICs. This amplifier achieves an average output power of 37 W CW across the 75 to 100 GHz band and more than 50 W below 80 GHz. The computed combining efficiency is, on average, 84.5% across the band. Using forced air cooling (in a wind-tunnel), the amplifier produces an output power of 45.6 dBm (36 W CW) ±1.4 dB across the 75 to 100 GHz band.