Patent ID: 6313808
Filing Date: 2001-11-06
Classification: H01Q

Abstract:
A feed horn comprising:first and second waveguides disposed at symmetrical positions with respect to a center line, each waveguide having an axis parallel to the center line; andfirst and second horns linked to the first and second waveguides, respectively, on extension lines of the axes of the first and second waveguides,wherein the first waveguide and the first horn have an aperture formed in the axial direction, the second waveguide and the second horn have an aperture formed in the axial direction,the first aperture is provided with an aperture end face at an outer end of the first horn, the second aperture is provided with an aperture end face at an outer end of the second horn,a diameter of each aperture on the aperture end face side is larger than a diameter of the aperture on the side of each of the first and second waveguides,an inner face of the aperture on the side of each of the first and second horns has an internal cone shape, andeach of the aperture end faces of the first and second horns of the first and second waveguides is tilted toward the center line by a predetermined angle such that the first and second horns are perpendicular to travelling directions of radio waves transmitted from at least two broadcasting satellites orbiting around the earth and reflected by an antenna on the ground.