Wave transmission lines and networks – Wave mode converters
Patent
1987-07-06
1988-11-15
LaRoche, Eugene R.
Wave transmission lines and networks
Wave mode converters
333157, 333 34, H01P 117
Patent
active
047852666
ABSTRACT:
A microwave polarizer is provided in the form of a wedge at the termination of a rod of dielectric material. Preferably the wedge tapers exponentially in order to provide a good impedance match. Circularly polarized radiation propagating along the rod experiences a differential phase shift at the wedge. This phase shift may be arranged to be 90.degree., so that linearly polarized radiation exits from the wedge. A continuous circular or square guide is used to contain the dielectric rod so that simultaneous orthogonal signals can be converted to or from circular polarizations. Such a wedge termination may be provided at the end of a splashplate or polyrod antenna feed, for a satellite communication system, where right-handed circular polarization is used on the up-link and left-handed circular polarization is used on the down link. The conventional orthomode transducer may be dispensed with, thereby enabling the sub-reflector to be located closer to the main reflector, thus reducing blockage and increasing the bandwidth.
REFERENCES:
patent: 2599753 (1952-06-01), Fox
patent: 3216017 (1965-11-01), Moore
patent: 3518691 (1970-06-01), Hallendorff
patent: 4195270 (1980-03-01), Rainwater
Andrews Bernard J.
Newham Paul
LaRoche Eugene R.
Lee Benny T.
The Marconi Company Limited
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