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In space RF communications payloads, it is increasingly required that high-power multi-channel transmitters and broadband receivers have shared, or closely adjacent RF feeds. Because of the large power level difference between the transmit and receive signals and the limitation of frequency allocation, harmonics generation due to passive non-linearities in the high-power transmission path can be a serious problem. This paper describes how to determine the signal levels and dominant mechanisms associated with non-linear dielectric behaviour in this context. A novel measurement system for testing dielectric samples is described and measurement results are provided for commonly used microwave dielectrics.

Non-Linear Behaviour in Commonly Used Non- Polar Dielectrics at Microwave Frequencies in Space RF Components