Optimization of input sensitivity and radiated power in millimeter wave communication satellites

The paper discusses the general problems of achieving maximum input sensitivity in mm-wave communication satellites by optimization of antenna design, reduction of feeder and input multiplexer losses and the utilization of a variety of low noise devices such as parametric amplifiers, FETs, and Schottky barrier mixers operating into low noise IF systems at frequencies from UHF into the K(u)-band. Consideration is also given to the technological tradeoffs associated with the combination of transmitting antenna and feeder systems, output multiplexer, and power amplifiers to achieve optimum output radiated power consistent with satellite weight, bus power and power amplifier efficiency. Experience gained with the Japan Communication Satellite is discussed as an illustration of the analysis.