Patent ID: 7436371

Claim:
An antenna, comprising: a plurality of waveguides juxtaposed adjacent to each other, each of the plurality of waveguides having a characteristic wavelength; a radiation aperture disposed in each of the plurality of waveguides, the radiation aperture including a first waveguide slot and a second waveguide slot formed therein, the first waveguide slot and the second waveguide slot being arranged in a waveguide slot pair; a first feeding waveguide and a second feeding waveguide, the first feeding waveguide being coupled to a first end of each of the plurality of waveguides, and the second feeding waveguide being coupled to a second end of each of the plurality of waveguides opposite the first end; a first coaxial waveguide feed positioned in the first feeding waveguide and a second coaxial waveguide feed positioned in the second feeding waveguide; wherein the first waveguide slot and the second waveguide slot of the slot pair are configured for radiating or receiving a circularly polarized (CP) field and wherein the first feeding waveguide comprises a first wall and the second feeding waveguide comprises a second wall, and wherein the first coaxial waveguide feed is positioned at a distance from the first wall of at least approximately one-fourth of the characteristic wavelength and the second coaxial waveguide feed is positioned at a distance from the second wall of at least approximately one-fourth of the characteristic wavelength.