Patent ID: 7095380

Claim:
An antenna apparatus comprising: a first orthomode transducer for combining first and second linearly polarized wave signals into a circularly polarized wave signal and for outputting the circularly polarized wave signal; a second orthomode transducer disposed above said first orthomode transducer, for separating the circularly polarized wave signal outputted thereto from said first orthomode transducer into third and fourth linearly polarized wave signals, and for outputting them; a first rectangular waveguide for propagating the third linearly polarized wave signal outputted thereto from said second orthomode transducer; a second rectangular waveguide disposed bilateral symmetrically to said first rectangular waveguide, for propagating the fourth linearly polarized wave signal outputted thereto from said second orthomode transducer; a third orthomode transducer disposed below said second orthomode transducer, for combining the third and fourth linearly polarized wave signals respectively propagated thereto by said first and the second rectangular waveguides into a circularly polarized wave signal, and for outputting the circularly polarized wave signal; and a radiator disposed above said third orthomode transducer, for emitting the circularly polarized wave signal outputted thereto from said third orthomode transducer to a reflector.