The Quad aperture /hoop/column/ antenna for advanced communications missions in the 1990'sThe possibility of meeting increased demand on the communications satellite system by utilizing a single satellite placed in geosynchronous orbit for service to the U.S. using the 4-6 GHz band and the 12-14 GHz band is discussed. To meet continental U.S. coverage requirements, approximately 220 spot beams 100 miles in diameter must be used. An F/D of 2.0 will be used in order to eliminate coma distortion effects, meet the low off-axis scan requirement, and fulfill design tradeoffs. Improvement on the best case crossover level of -9 dB can be accomplished by using a co-boresighted multiple reflector system and interleaving the beams from each offset reflector antenna. Shown are the illumination surfaces and the corresponding feed arrays in the quad aperture design and the reflector/feed system configuration for simultaneous operation in the two bands.
Document ID
19830037403
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Sikes, L. D. (NASA Langley Research Center Hampton, VA, United States)
Campbell, T. G. (NASA Langley Research Center Harris Government Electronic Systems Div., Hampton, VA, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1981
Subject Category
Communications And Radar
Meeting Information
Meeting: International Conference on Antennas and Propagation