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The Table summarizes the information required by the ground-station antenna designer for some of the major upcoming communication satellite systems that have a significant millimeter-wave content. With the advent of low-Earthorbit systems like Motorola's Iridium, which require sophisticated beams, LEO satellites may soon be carrying phased arrays and reflector antennas. The use of millimeter-wave frequencies allows these structures to be small and therefore more easily deployed on satellites.