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

1979-03-13

Smith, Alfred E.

Communications: radio wave antennas

Antennas

With polarization filter or converter

343909, 343840, H01Q 1110, H01Q 1524

Patent

active

041445350

ABSTRACT:
The present invention relates to polarization grids for use in offset antenna arrangements, each of the grids comprising a plurality of nonparallel spaced-apart elements which are mounted between an offset curved focusing main reflector and an associated feedhorn in order to obtain linear polarization everywhere in the far field of the reflector. Exemplary types of grids in accordance with the present invention are (1) a family of hyperbolae on an arbitrary plane S, (2) projections of these hyperbolae on an arbitrary surface, and (3) a set of straight lines through a certain point F.sub.o.sup.' on plane S which set approximates the hyperbolae of type (1) by means of a tangent to each of the hyperbolae.

REFERENCES:
patent: 3148370 (1964-09-01), Bownan
patent: 4001836 (1977-01-01), Archer et al.

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