For use in a satellite communication system which carries out communication through a satellite by the use of an up-link frequency band and a down-link frequency band, each of the up-link and the down-link frequency bands has a plurality of frequency subbands spaced apart from one another with frequency...http://www.google.de/patents/US4905221?utm_source=gb-gplus-sharePatent US4905221 - Earth station capable of effectively using a frequency band of a satellite
