Method and apparatus for substantially reducing cross polarized

Details Method and apparatus for substantially reducing cross polarized Method and apparatus for substantially reducing cross polarized

1977-02-22

1978-08-22

Smith, Alfred E.

Communications: radio wave antennas

Antennas

With polarization filter or converter

343909, 343775, 343840, H01Q 1906, H01Q 1522

Patent

active

041092538

ABSTRACT:
The polarization properties of the field radiated from a polarization grid have been found to be similar to those in the aperture of an offset curved focusing reflector. Therefore, broadband cancellation of the polarization rotation in a large offset reflector is substantially accomplished in the present invention by the opposite prerotation of the incident feed radiation via a polarization grid. For maximum cancellation the polarization grid, having parallel spaced-apart elements, is disposed at an angle to a plane normal to the feed axis of the offset reflector which approximates one-half of the value of the angle between the feed axis and the offset reflector axis.

REFERENCES:
patent: 3148370 (1964-09-01), Bowman
patent: 3805268 (1974-04-01), Britt

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