Single reflector multibeam antenna arrangement with a wide field

Details Single reflector multibeam antenna arrangement with a wide field Single reflector multibeam antenna arrangement with a wide field

1987-11-05

1988-11-22

Sikes, William L.

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343781P, 343781R, H01Q 1914

Patent

active

047869100

ABSTRACT:
The present invention relates to an antenna comprising a plurality of feeds, and either a single reflector or a single lens wherein the reflector or lens includes a predetermined curved major surface that produces a maximum field of view in a first one of two principal planes of the antenna. The major curved surface is designed to produce a first and a second "stigmatic" focal point, which are spaced apart by a predetermined amount on either side of an axis normal to the center of the reflector or lens in the first principal plane, such that the coefficient of astigmatism is at a maximum predetermined tolerable amount at the center and at the opposite edges of the maximum field of view to produce a peanut-shaped area where the coefficient of astigmatism is within tolerable limits. For the lens design, the plurality of feeds can be disposed within the peanut-shaped area, while for the reflector design the feeds should preferably be disposed within the peanut-shaped area where no antenna aperture blockage occurs.

REFERENCES:
patent: 3146451 (1964-08-01), Sternberg
patent: 3886561 (1975-05-01), Beyer
patent: 3922682 (1975-11-01), Hyde
patent: 3995275 (1976-11-01), Betsudan et al.
patent: 4224626 (1980-09-01), Sternberg
patent: 4343002 (1982-08-01), Lutt
patent: 4355314 (1982-11-01), Ohm
patent: 4435714 (1984-03-01), Lutt
Turrin, Bell System Technical Jrnl., vol. 54, No. 6, Jul.-Aug. 1975, pp. 1011-1026.

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