Communications: radio wave antennas – Antennas – Plural separate diverse type
Patent
1979-12-20
1981-08-18
Lieberman, Eli
Communications: radio wave antennas
Antennas
Plural separate diverse type
343756, 343771, 343840, H01Q 1318, H01Q 19195, H01Q 2128
Patent
active
042849918
ABSTRACT:
A bifunctional antenna of a primary/secondary radar system comprises a reflector having a concave front surface formed with a row of slots along a horizontal generatrix, the slots lying in front of respective cavities excitable to radiate interrogation signals in a directive sum pattern and supplemental radiation in a differential control pattern designed to blank minor lobes of the interrogation pattern. Some of the cavities and slots are symmetrically duplicated on a dielectric cap covering the convex rear surface of the reflector. The reflector and its cap form a closed shell of dielectric material, specifically a glass mat impregnated with epoxy resin, overlain at the front by a fiber-glass fabric incorporating orthogonally intersecting insulated copper wires. The fabric also lines the inner walls of each cavity which is filled with dielectric material; its radiating slot is spanned only by horizontal wires paralleling the plane of polarization of target-seeking radiation from a source illuminating the reflector.
REFERENCES:
patent: 3039098 (1962-06-01), Bickmore
patent: 3550135 (1970-12-01), Bodmer
patent: 3701158 (1972-10-01), Johnson
"Thomson-CSF"
Lieberman Eli
Ross Karl F.
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