COMPACT OFFSET GREGORIO ANTENNA SYSTEM PROVIDING ADJACENT HIGH GAIN ANTENNA BEAM

摘要

PROBLEM TO BE SOLVED: To provide a satellite use reflection antenna system where each antenna beam demarcates individual arrival range cell in a beam arrival range, and feeds, a sub reflector and a main reflector are placed and oriented so that each antenna beam nearly symmetrically shaped is supplied adjacent over the arrival range on the basis of the global scale. SOLUTION: A feed array 22, a sub reflector 27, and a main reflector 25 configure an offset Gregorio antenna system 21. The feed array 22 includes a plurality of feeds that are coupled with a feed network acting like combining radiation beams of a pre-selected feed number so as to produce a plurality of composite radiation beams shaped to have a prescribed contour. Each composite radiation beam is oriented to be made incident onto each predetermined location of the sub reflector that orients the radiation beams to the main reflector 25 and the main reflector reflects each composite radiation beam in a pre- selected direction.