Communications: radio wave antennas – Antennas – Traveling wave type
Patent
1983-08-30
1985-08-13
Lieberman, Eli
Communications: radio wave antennas
Antennas
Traveling wave type
343797, 343897, H01Q 1104
Patent
active
045353379
ABSTRACT:
A cross polarized wire grid antenna is disclosed which produces circularly polarized electromagnetic radiation. A subarray layer of the present invention comprises a plurality of interconnected rectangular elements. The elements are connected and fed so that the short sides of the rectangles serve essentially as radiating elements, and the long sides of the rectangles serve essentially as nonradiating transmission line elements. In an embodiment of the present invention, a first subarray comprises two layers of horizontally polarized radiators and a second subarray comprises two layers of vertically polarized radiators. The two subarrays are combined to form a cross-polarized antenna array which produces circularly polarized electromagnetic radiation. The layers of each subarray are electrically isolated from one another and are displaced 1/2.lambda. with respect to each other perpendicular to the direction of polarization of the subarray. The layers of each subarray are fed in-phase with respect to each other, and each subarray is fed 90.degree. out of phase with respect to the other. Feed can be provided between the layers of a subarray by providing balanced two-wire feed to one layer at the broken center of a first radiating feed element and cross-coupling the first feed element to the immediately adjacent second radiating feed elements of the other layer of the subarray.
REFERENCES:
patent: 3541564 (1970-11-01), Fisk
patent: 4293858 (1981-10-01), Hockham
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