Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1974-09-17
1976-02-10
Lieberman, Eli
Communications: radio wave antennas
Antennas
With polarization filter or converter
343786, H01Q 1302, H01Q 1524
Patent
active
039381595
ABSTRACT:
A dual frequency band horn-type antenna feed is described which has primary application to optimally illuminate a parabolic cylindrical reflector operating simultaneously at high power in both of the two bands. The principle of the invention is applicable to any two frequency bands regardless of their frequency separation including coincidence as a limiting case. The basic requirement of such a feed is that it must be as directive as possible within constraint of the feed aperture size in the plane of the cylinder axis because the cylindrical reflector does not collimate the beam in this plane and it must be relatively nondirective in the plane of the parabola for efficient illumination of the reflector. This requirement requires the phase front in the directive plane to be controlled within a small fraction of a wavelength at both frequencies.
REFERENCES:
patent: 2317464 (1943-04-01), Katzin
patent: 3013267 (1961-12-01), Rotman
patent: 3055004 (1962-09-01), Cutler
patent: 3100894 (1963-08-01), Giller et al.
patent: 3656166 (1972-04-01), Klopach
patent: 3754273 (1973-08-01), Takeichi et al.
Ajioka James S.
Schaffer Kenneth L.
Himes Robert H.
Hughes Aircraft Company
Lieberman Eli
MacAllister W. H.
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