Communications: radio wave antennas – Antennas – Wave guide type
Patent
1992-12-22
1996-08-13
Hajec, Donald
Communications: radio wave antennas
Antennas
Wave guide type
343781CA, 343837, H01Q 1914
Patent
active
055460976
ABSTRACT:
A dual-reflector antenna system (40) is provided for generating a shaped main beam radiation pattern (20) and at least one additional secondary spot beam radiation pattern (30,32). The antenna system (40) includes a main shaped reflector (10) having a shaped reflective surface (11) operatively coupled to a subreflector (12) for communicating therewith. A main feed horn (14) communicates directly with the subreflector (12) so as to reflect first energy to and from the main reflector (10) within a shaped beam radiation pattern (20). In a preferred embodiment, the subreflector (12) has an ellipsoidal reflective surface (13) which communicates directly with the main reflector (10) via an inverted reflective path (17) which has a converging focal point (18). One or more auxiliary feed horns (24,26) are operatively coupled directly to the main reflector so as to directly communicate therewith and reflect second energy within one or more additional radiation patterns (30,32). The first and second feed horns (24,26) are preferably located separate from the reflective path (17) so as to avoid interference therewith. In an alternate embodiment, a subreflector (12') with a hyperboloidal reflective surface (13') may be used.
REFERENCES:
patent: 3271771 (1966-09-01), Hannan et al.
patent: 3281850 (1966-10-01), Hannan
patent: 3927408 (1975-12-01), Schmidt et al.
patent: 4017865 (1977-04-01), Woodward
patent: 4223316 (1980-09-01), Drabowitch
patent: 4777491 (1988-10-01), Bassi et al.
patent: 4792811 (1988-12-01), Aubry et al.
Fermelia, Jr. Louis R.
Ramanujam Parthasarathy
Shin Charlie C.
Stambaugh Andrew J.
Denson-Low Wanda K.
Hajec Donald
Ho Tan
Hughes Aircraft Company
Lindeen III Gordon R.
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