Communications: radio wave antennas – Antennas – Wave guide type
Patent
1976-06-21
1978-09-19
Smith, Alfred E.
Communications: radio wave antennas
Antennas
Wave guide type
343840, 343781P, H01Q 1914, H01Q 1912
Patent
active
041157826
ABSTRACT:
An antenna for use in propagating or receiving microwave radiation having both left-hand and right-hand circular polarization. The left-hand and right-hand circularly polarized radiation may be transmitted or received simultaneously without interference with one another, that is, they are isolated from one another by 27 dB or more. The preferred antenna comprises an array of closely clustered waveguide elements each of which converts respective linearly polarized signals to left-hand and right-hand circularly polarized signals and vice versa. Isolation means also are provided in each of the waveguide elements for preventing radiation either propagated or received by a waveguide element from being coupled into the radiation being propagated or received by other waveguide elements in the array. Preferably, square waveguide is utilized for the array elements and the isolation is provided by a plurality of conductive elements mounted on each of the open ends of the waveguide elements. The cluster array of waveguide elements may include dummy elements, may be fed with electromagnetic signals having various phase and power differences to produce desired radiation transmission or reception patterns and may be used to illuminate a parabolic reflector having a secondary radiation pattern. A single waveguide element or an array of them may be used in communications satellites and the like or may be used in radar or other applications.
REFERENCES:
patent: 3140491 (1964-07-01), Ashbaugh
patent: 3599219 (1971-08-01), Holtum
patent: 3680143 (1972-07-01), Ajioka
patent: 3696435 (1972-10-01), Zucker
patent: 3958193 (1976-05-01), Rootsey
Gould Harry J.
Han Ching C.
Barlow Harry E.
Brown Robert W.
Ford Motor Company
Sadler Clifford L.
Smith Alfred E.
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