EHF SATCOM terminal antennas. I

The system factors of antenna performance are reviewed, and some of the more pertinent tradeoffs leading to affordable solutions are discussed. A distinction is made between mobile and fixed platform applications. A mobile antenna at 20/45 GHz which has been designed, built, and tested is discussed as an example. It is noted that antenna system factors may be separated into two classes, namely communication requirement factors and platform characteristic factors. A table is included summarzing the major factors within each of the respective classes. The requirements, components, and system tradeoffs associated with the planned MILSATCOM earth terminal antennas are discussed. The treatment concentrates on the applications as they are now known for 20-GHz downlinks and 45/30-GHz uplinks.