Low side lobe Gregorian antenna

Details Low side lobe Gregorian antenna Low side lobe Gregorian antenna

1983-09-12

1986-12-02

Lieberman, Eli

Communications: radio wave antennas

Antennas

Wave guide type

343838, H01Q 1919

Patent

active

046268634

ABSTRACT:
A microwave antenna comprising the combination of a paraboloidal main reflector; a subreflector located such that the paraboloidal main reflector and the subreflector have a common focal point lying between the main reflector and the subreflector; a feed horn for transmitting microwave radiation (preferably symmetrically) to, and receiving microwave radiation from, said subreflector; and a shield connected to the peripheral portion of the subreflector and having an absorbing surface which reduces side lobe levels both by capturing the feed horn spillover energy and by reducing the diffraction of microwave radiation from the edge of the subreflector. The shield is preferably formed as a continuous axial projection extending from the periphery of the subreflector toward the main reflector substantially parallel to the axis of the feed horn. The reflective surface of the subreflector is suitably a section of an approximate ellipse.

REFERENCES:
patent: 3176301 (1965-03-01), Wellons et al.
patent: 3314071 (1967-04-01), Lader et al.
patent: 3662393 (1972-05-01), Cohn
patent: 4096483 (1978-06-01), Bui Hai et al.
patent: 4263599 (1981-04-01), Bielli et al.
Burdine et al, "A Low Side Lobe Earth Station Antenna for the 4/6 GHz Band," Microwave Journal, Nov. 1980, pp. 53-58.

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