Communications: radio wave antennas – Antennas – With polarization filter or converter
Patent
1989-06-13
1990-10-23
Hille, Rolf
Communications: radio wave antennas
Antennas
With polarization filter or converter
333 21A, 333117, 343772, H01Q 1300, H01P 117
Patent
active
049658689
ABSTRACT:
A polarization selector system, suitable for use with an antenna for radiating electromagnetic waves at a variety of preselectable polarizations, is formed of an orthogonal mode launcher of electromagnetic waves, and a hybrid coupling assembly for driving the launcher. The coupling assembly has a pair of waveguides sharing a common wall. A set of hybrid couplers of differing coupling ratios, and including a mechanically displaceable gate within each coupler, is disposed serially along the common wall.
The gates are individually positionable to provide for coupling of differing amounts of electromagnetic power with 90 degree phase shift between the waveguides. Output signals of the waveguides connect with respective ones of a pair of mode launching probe assemblies in the mode launcher to energize the probe assemblies for producing a resulting electromagnetic wave having selectively right and left hand circular or elliptical polarization as well as linear polarization which can be advanced in orientation in increments of ninety degrees.
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patent: 4710734 (1987-12-01), Sterns
patent: 4812788 (1989-03-01), Wong et al.
patent: 4818964 (1989-04-01), Wong
Kroupa Gregory D.
Wong Mon N.
Brown Peter Toby
Denson-Low W. K.
Hille Rolf
Hughes Aircraft Company
Mitchell Steven M.
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