Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1990-10-31
1993-04-27
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343753, 343781R, H01Q 1919
Patent
active
052066584
ABSTRACT:
A multiple beam antenna system may be constructed for reducing a spillover loss n efficiency, improving beam crossover, and reducing undesired sidelobes by the addition of three dielectric lenses between a feed horn cluster connected to a beam forming network and an objective collimator. The system includes a beam forming network including a plurality of feed horns in a feed horn cluster, an objective, and an imaging lens having a lateral magnification less than unity for focusing a reduced image of the feed horn cluster at a predetermined point in space. A field lens is positioned at that predetermined point in space, and an amplitude shaping lens is positioned between the field lens and the objective. The amplitude shaping lens redirects the rays of the image transmitted by the field lens to be denser in the central region of the objective, and reduce the sidelobes of the far field pattern of the transmitted beams.
REFERENCES:
patent: 3396397 (1968-08-01), Kott
patent: 3430244 (1964-11-01), Bartlett et al.
patent: 3911440 (1975-10-01), Mizusawa
patent: 4254421 (1981-03-01), Kreutel
patent: 4270129 (1981-05-01), Herper et al.
patent: 4435714 (1984-03-01), Luh
patent: 4503434 (1985-03-01), Luh
"Antenna Handbook: Theory, Applications, and Design", Lo et al, Van Nostrand Reinhold Company, pp. 16-33 to 16-38.
"A Feed Cluster Image Reduction System", Digest, J. Wokurka, IEEE AP-S Symposium, Blacksburg, Va. Jun. 1987, pp. 199-202.
Arthur David J.
Ginsberg Lawrence N.
Ho Tan
Rockwell International Corporation
Silberberg Charles T.
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