A CW 4-W Ka-band power amplifier utilizing MMIC multichip technology

This paper describes a 28-GHz power amplifier with 4.5-W output power under CW operation. The amplifier utilizes four fully matched MMICs, in which 0.35-/spl mu/m-long gate GaAs-based heterojunction FETs are employed. The developed power amplifier also provides a continuous-wave (CW) output power of 3 W over the bandwidth of 2 GHz at Ka-band.