Communications: radio wave antennas – Antennas – Wave guide type
Patent
1981-08-31
1984-01-10
Lieberman, Eli
Communications: radio wave antennas
Antennas
Wave guide type
343840, H01Q 1919
Patent
active
044255667
ABSTRACT:
The present invention relates to an antenna arrangement which uses an imaging reflector (10) combined with a small feed or horn (14) which is capable of launching or receiving a spherical wavefront (18) to obtain a nearly frequency independent field distribution over a large antenna aperture. The antenna arrangement comprises a parabolic main reflector (10) disposed confocally with one focal point of a subreflector means (12) and a feed (14) disposed with the apex of the spherical wavefront at the other focal point of the subreflector means and the aperture of the feed centered on the image of the main reflector. If the rim of the feed aperture corresponds to an image of the edge of the main reflector, spill-over is substantially eliminated. Generally, any feed arrangement comprising a feed and subreflector means which transforms a spherical wavefront from the feed into a spherical wavefront emanating from the focal point of the parabolic main reflector can be used.
REFERENCES:
patent: 3414904 (1968-12-01), Ajioka
patent: 3936837 (1976-02-01), Coleman et al.
patent: 3949404 (1976-04-01), Fletcher et al.
patent: 4203105 (1980-05-01), Dragone et al.
patent: 4223316 (1980-09-01), Drabowitch
patent: 4259674 (1981-03-01), Dragone et al.
Dragone et al.; Imaging Reflector . . . Small Array; BSTJ, vol. 58, No. 2, Feb. 1979, pp. 501-515.
Dragone et al.; Satellite Phased Array . . . To Reduce Grating Lobes; BSTJ, vol. 59, No. 3; Mar. 1980; pp. 449-461.
Bell Telephone Laboratories Incorporated
Lieberman Eli
Pfeifle Erwin W.
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