Discrete devices made from GaAs have been used for many years in sensitive receivers in the microwave and millimetre-wave (mm-wave) bands (1-300 GHz). An extensive international research effort is now under way to develop GaAs monolithic integrated circuits (MMICs) for microwave and mm-wave frequencies. This paper will review recent developments in mm-wave integrated circuit technology.
J. W. Archer
"Millimetre-Wave, Monolithic And Hybrid Integrated Circuit Technology", Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); doi: 10.1117/12.978450; https://doi.org/10.1117/12.978450