Patent ID: 9484637
Filing Date: 2016-11-01
CPC Classification: H01Q

Claim Text:
1. A waveguide, comprising: a horn-shaped segment, an entrance, an aperture, and a grating placed next to the aperture, wherein the waveguide is configured to transmit at least one linearly polarised electromagnetic wave for propagation between the entrance and the aperture of the waveguide along a first axis, the grating comprising a frame encircling a set of plates extending longitudinally and continuously from a first short side of the frame to a second short side of the frame, to form a linear polarising filter attenuating a cross-polarisation component of the electric field of the electromagnetic wave, said cross-polarisation component being orthogonal to a second axis orthogonal to the first axis, each plate of the set of plates includes corrugations, depths of respective corrugations and intervals between adjacent corrugations along a direction in which the set of plates longitudinally extend being dimensioned and positioned to reinforce the attenuating of said cross-polarisation component, wherein the corrugations are slits cut in a side opposite the entrance of the waveguide, each corrugation having a depth along the first axis and a width along the direction in which the set of plates longitudinally extend from the first short side to the second short side, the depths of respective corrugations and the intervals between respective adjacent corrugations along the direction in which the set of plates longitudinally extend being defined to reinforce the attenuating of said cross-polarisation component, widths of said respective corrugations being smaller relative to the intervals between the adjacent corrugations and relative to depths of said respective corrugations.