Double grid reflector antenna
AssigneeAgence Spatiale Europeenne
InventorsAntoine G. Roederer, Gerald A. E. Crone
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Abstract
A double grid reflector antenna for radiating different signals having pure linear orthogonal polarization comprises a couple of identical and superposed reflecting grids. One of said grids has been rotated its boresight to disengage its focus from that of the other, and feeds are set in the focal plane of the respective grids. The front grid reflects indifferently either horizontal or vertical polarization, while transmitting the orthogonal polarization to be reflected by the rear grid.
Claims7
A double-grid reflector antenna for radiating different signals having pure linear orthogonal polarization, comprising a couple of reflecting grids cut out as portions of the same paraboloid, each grid cooperating with a respective feed, located at its focus, wherein said grids are identical and superposed, and one of the grids is rotatable around its boresight to shift its focus away from that of the other grid to vary the directions of the two orthogonally polarized beams to different directions, the grids having been slightly shifted away from each other, in a direction parallel to the focal axis so as to provide a clearance between said grids during the rotation, and each of said feeds being placed in the focal plane of its associated grid wherein the feeds can be counter rotated to store nominal orientation of the separate grid patterns.
Dependencies are inferred from the claim text.