Communications: radio wave antennas – Antennas – With spaced or external radio wave refractor
Patent
1974-04-24
1976-02-24
Lieberman, Eli
Communications: radio wave antennas
Antennas
With spaced or external radio wave refractor
343854, H01Q 1906, H01Q 326
Patent
active
039407705
ABSTRACT:
A cylindrical array antenna is disclosed wherein rows of antenna elements disposed about the periphery of the antenna each include a feed network coupled to a monopulse arithmetic unit through a radial line power divider and a hemispherical sector selector switching network. Monopulse "sum" and circumferential "difference" patterns are obtained by dividing a selected hemispherical sector into four adjacent antenna aperture segments. The antenna elements associated with alternate antenna aperture segments are coupled to the arithmetic unit in like polarity and the antenna elements associated with adjacent antenna aperture segments are coupled to such arithmetic unit in opposite polarity. With such arrangement cross-polarization or "null filling" effects associated with the cylindrical array antenna are reduced.
REFERENCES:
patent: 3568207 (1971-03-01), Boyns et al.
patent: 3653057 (1972-03-01), Charlton et al.
patent: 3680140 (1972-07-01), Chalfin
patent: 3729742 (1973-04-01), Boyns
patent: 3827055 (1974-07-01), Bogner et al.
Balzano Quirino
Fassett Matthew
Lieberman Eli
McFarland Philip J.
Pannone Joseph D.
Raytheon Company
Sharkansky Richard M.
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