Electromagnetic polarization selector

Details Electromagnetic polarization selector Electromagnetic polarization selector

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.

REFERENCES:
patent: 2948863 (1960-08-01), Honda
patent: 3995239 (1976-11-01), Head et al.
patent: 4158183 (1979-06-01), Wong et al.
patent: 4691177 (1987-09-01), Wong et al.
patent: 4710734 (1987-12-01), Sterns
patent: 4812788 (1989-03-01), Wong et al.
patent: 4818964 (1989-04-01), Wong

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