Patent ID: 8493161

Claim:
A compact excitation assembly for generating a circular polarization in an antenna, the compact excitation assembly comprising: a diplexing asymmetric orthomode transducer OMT and a branched coupler, wherein: the OMT is a two-branched OMT and consists of a main waveguide with a square or circular cross section and a longitudinal axis ZZ′, and only two branches coupled to the main waveguide by respectively only two parallel coupling slots, the only two parallel coupling slots are spaced apart by 90° and are made in walls of the main waveguide, and the only two branches of the OMT are respectively linked to two waveguides of an unbalanced branched coupler, the unbalanced branched coupler having two different splitting coefficients (α, β) that are optimized to compensate for electric field orthogonal spurious components (δy, δx) produced by the asymmetry of the OMT.