Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1989-03-30
1990-11-20
Hille, Rolf
Communications: radio wave antennas
Antennas
With polarization filter or converter
343776, 343786, H01Q 1900
Patent
active
049721992
ABSTRACT:
An antenna is constructed of an array of contiguous circular cylindrical radiators each of which extends forwardly of a radiator assembly producing two circularly polarized waves of opposite direction of rotation of their respective electric fields. The radiators measure one wavelength at the transmit frequency band, and approximately 1.5 wavelengths in diameter at the receive frequency band. A section of cylindrical waveguide in the back of each radiator assembly encloses a microwave structure for generating the circularly polarized waves, the microwave structure including an orthomode transducer at the back of the assembly and an electric field rotator disposed forward of the orthomode transducer. In each radiator assembly, there is disposed between the rotator and the radiator a transition between smaller diameter waveguide to larger diameter waveguide. The transition may have the form of a step or a flare for a more gradual transition. The transducer produces a higher order TM.sub.11 mode which is evanescent within the radiator 24. By attenuating the transverse magnetic mode, a match is made between electric field components thereof and those of curved electric fields of the dominant propagating modes to cancel curvature and reduce cross polarization between the two circularly polarized waves in each radiator.
REFERENCES:
patent: 3413641 (1968-11-01), Turrin
patent: 3564552 (1971-02-01), Fraizer, Jr.
patent: 3633208 (1972-01-01), Ajioka
patent: 3662393 (1972-05-01), Cohn
patent: 3680145 (1972-07-01), Beguin
patent: 3731236 (1973-05-01), DiTullio et al.
patent: 4141015 (1979-02-01), Wong et al.
patent: 4442437 (1984-04-01), Chu etal.
patent: 4710776 (1987-12-01), Roederer et al.
patent: 4757324 (1988-07-01), Dhanjal
"A New Horn Antenna with Suppressed Sidelobes and Equal Beamwidths" by P. D. Potter, The Microwave Journal, vol. 6, pp. 71-78, Jun. 1963.
Bains Paramjit S.
Paul Dean N.
Raghavan Krishnan
Denson-Low Wanda K.
Hille Rolf
Hughes Aircraft Company
Le Hoang-anh
Mitchell Steven M.
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