Communications: radio wave antennas – Antennas – Traveling wave type
Patent
1979-11-23
1981-10-06
Lieberman, Eli
Communications: radio wave antennas
Antennas
Traveling wave type
343846, 343854, H01Q 1104, H01Q 1524
Patent
active
042938589
ABSTRACT:
A polarization-agile radar array employing at least one linear array having a periodic first meander line and a second meander line which is a close-spaced, mirror image of the first such line, these lines being separately driven so that when they are fed with equal amplitude and phase, the polarization will be in a first plane and when driven in anti-phase, orthogonal polarization is achieved. The meander lines extend in the same plane which is parallel to a ground from which it is spaced. Intermediate polarization angles are achieved by intermediate phase and amplitude relationships of the drive, equal amplitude and phase quadrature exitation providing circular polarization. A series of generally parallel, conductive vanes is affixed to the ground plane to compensate for the reactance of longitudinal sections of the meander line longitudinal feeder (connecting) sections as the wave passes therethrough when its polarization is essentially parallel to those feeder lines. In opposite polarization situations, the upper surface of the corrugated ground plane itself is the operative reflection surface, the radiation coupling at and between polarization extremes thereby being substantially uniform.
REFERENCES:
patent: 3806946 (1974-04-01), Tiuri et al.
patent: 4021810 (1977-05-01), Urpo et al.
International Telephone and Telegraph Corporation
Lieberman Eli
O'Neil William T.
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