Communications: radio wave antennas – Antennas – Wave guide type
Patent
1993-12-22
1995-10-17
Hajec, Donald
Communications: radio wave antennas
Antennas
Wave guide type
343761, 343781CA, 343839, H01Q 1919
Patent
active
054594758
ABSTRACT:
A novel method for calculating the surface shapes for subreflectors in a suboptic assembly of a tri-reflector spherical antenna system is introduced, modeled from a generalization of Galindo-Israel's method of solving partial differential equations to correct for spherical aberration and provide uniform feed to aperture mapping. In a first embodiment, the suboptic assembly moves as a single unit to achieve scan while the main reflector remains stationary. A feed horn is tilted during scan to maintain the illuminated area on the main spherical reflector fixed throughout the scan thereby eliminating the need to oversize the main spherical reflector. In an alternate embodiment, both the main spherical reflector and the suboptic assembly are fixed. A flat mirror is used to create a virtual image of the suboptic assembly. Scan is achieved by rotating the mirror about the spherical center of the main reflector. The feed horn is tilted during scan to maintain the illuminated area on the main spherical reflector fixed throughout the scan.
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Nomoto, et al., "A Ku-Band 4-Beam Earth Station Antenna with a 6.5-m Fixed Spherical Reflector", Proc. of 14th International Comm. Satellite Sys. Cont. (Wash. D.C.), Mar. 1992, pp. 702-710.
Shen Bing
Stutzman Warren L.
Center For Innovative Technology
Hajec Donald
Phan Tho
Virginia Polytechnic Institute and State University
Virginia Tech Intellectual Properties Inc.
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