Cassegrain antenna with improved subreflector for terrestrial co

Details Cassegrain antenna with improved subreflector for terrestrial co Cassegrain antenna with improved subreflector for terrestrial co

1974-06-06

1976-09-28

Lieberman, Eli

Communications: radio wave antennas

Antennas

Wave guide type

343840, H01Q 1918

Patent

active

039835600

ABSTRACT:
A Cassegrain antenna for use in terrestrial communication systems. The antenna has the conventional subreflector including a central area which provides tapered illumination of the entire main reflector, and a peripheral area which directs spillover from the central area onto the peripheral portion of the main reflector to improve the uniformity of illumination of the main reflector, thereby improving illumination efficiency and reducing gain loss due to spillover. The central and peripheral areas of the subreflector are preferably both surfaces of revolution of conic sections of the same kind, such as hyperboloids, ellipsoids or paraboloids, although the peripheral area may be a frustoconical surface if desired. The virtual focal points of the two conic sections of the subreflector are both coincident with the phase center of the feed horn.

REFERENCES:
patent: 3209361 (1965-09-01), Potter
patent: 3241147 (1966-03-01), Morgan
patent: 3254342 (1966-05-01), Miller
patent: 3706999 (1972-12-01), Tocquec et al.

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