Communications: radio wave antennas – Antennas – Wave guide type
Patent
1988-12-27
1989-12-26
Hille, Rolf
Communications: radio wave antennas
Antennas
Wave guide type
343772, 333 21A, 333251, H01Q 1302
Patent
active
048901180
ABSTRACT:
A feed horn employing a novel compensator design which substantially reduces off-axis cross polarized components of circularly polarized energy over a wide range of angular directions. The compensator comprises a plurality of L-shaped compensating conductors disposed in a generally symmetrical fashion about a longitudinal axis of the feed horn. The conductors extend inwardly from the output aperture of the feed horn and then radially outwards a predetermined distance away from the axis toward the horn sidewall. The conductors are disposed at an angle relative to the axis, which angle is generally defined by an cone whose apex is the same as the apex of the feed horn. A nonconducting support structure supports the conductors within the feed horn. A dielectric matching member is disposed in the feed horn to eliminate unwanted energy reflections.
REFERENCES:
patent: 3573838 (1971-04-01), Ajioka
patent: 4114121 (1978-09-01), Barlow
patent: 4268804 (1981-05-01), Spinner et al.
patent: 4712110 (1987-12-01), Branigan et al.
"A New Horn Antenna with Suppressed Sidelobes and Equal Beamwidths," by P. D. Potter, Microwave Journal, VO, VI, pp. 71-78, Jun. 1963.
"The Circular Waveguide Step-Discontinuity Mode Transducer," by W. J. English, IEEE Trans. Microwave Theory Tech., vol. MTT-21, pp. 633-636, Oct. 1973.
"Phase Characteristics of a Circularly Symmetric Dual-Mode Transducer," by K. K. Agarwal, IEEE Trans. Microwave Theory Tech., vol. MTT-18,, pp. 69-71, Jan. 1970.
"Fields and Waves in Modern Radio," by Simon Ramo and John R. Whinnery, published by John Wiley and Sons, and in particular at pp. 335-338.
Hudspeth Thomas
Steinberg Fritz
Denson-Low Wanda
Hille Rolf
Hughes Aircraft Company
Johnson Doris J.
Mitchell Steven M.
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