A satellite communication system includes a plurality of spacecraft in geosynchronous orbit, where each spacecraft provides a plurality of beams on the surface of the earth, and a plurality of ground stations individual ones of which are located in one of the beams for transmitting uplink signals to...http://www.google.de/patents/US6496682?utm_source=gb-gplus-sharePatent US6496682 - Satellite communication system employing unique spot beam antenna design
