Millimeter-Wave IMPATT Power Amplifier/Combiner

The development of a two-stage millimeter-wave IMPATT power amplifier/combiner is described herein. The driver stage consists of a two-diode hybrid-coupled amplifier and the output stage consists of a four-diode combiner (a pair of hybrid-coupled amplifiers). An output power of 1 W was achieved with a 22-dB small-signal gain and a 6-GHz bandwidth in the 60-GHz range. Design considerations and experimental data are presented in detail.