Directive disk feed system

Details Directive disk feed system Directive disk feed system

1974-03-26

1976-02-03

Lieberman, Eli

Communications: radio wave antennas

Antennas

With spaced or external radio wave refractor

343779, 343833, 343840, H01Q 1916, H01Q 2126

Patent

active

039368351

ABSTRACT:
A multiple beam antenna having either a main reflector or a lens is illuminated by a feed system comprising a number of primary radiators such as dipole elements. Primary radiation from each dipole element reflects from the principal reflector to produce a different respective one of the multiple secondary beams in the remote field. A disk-shaped electrically conductive director is located in the primary radiation path near each primary radiator. Each director operates both to shape the primary pattern of its respective primary radiator directly, and also to excite parasitic radiation in neighboring primary radiators so as to produce a primary radiation pattern whose shape approximates a sector of a circle, thereby producing high illumination efficiency at the main reflector. The desired sector shape of primary pattern is achieved despite relatively close lateral spacing between adjacent primary radiators of the feed system. The close spacing enables achievement of high beam crossover level between adjacent secondary beams in the remote field.

REFERENCES:
patent: 3308468 (1967-03-01), Hannan
patent: 3774223 (1973-11-01), Ehrenspeck et al.

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