Ka-band LNA module with 1.9dB NF for communications satellite payload

A LNA module, integrated microwave assembly was developed for Ka-band Communications Satellite payload in the frequency range of 29.6 similar to 30.0GHz. The Noise Figure of the module has been recorded as low as 1.9dB at ambient temperature. The module has been tested over temperature range of -15 similar to +71 degrees C and shows 33.3dB of gain within 0.7dBp-o variation as it has the function of gain compensation. The mass of the module is 94grams that provides the flexibility in payload assembly. Two low noise amplifier MMIC chips were used in the module and those chips had been fabricated using 0.15um GaAs pHEMT process. This paper describes the design, fabrication and performance of the LNA module. This will include the MMIC design, the mechanical design of module, and the design of waveguide-to-microstrip transition.