Millimetre wave receiver components using packaged HEMTs

A narrowband low-noise amplifier (LNA) and a mixer at 30 GHz have been developed using packaged commercial HEMTs (high electron mobility transistors) and waveguide matching circuits. The four-stage HEMT LNA provided 26 dB gain and a 2.8 dB noise figure at 30 GHz. The HEMT mixer provided a conversion gain of 0.5 dB with 5 dB noise figure. The design features very simple construction and tuning.<<ETX>>