Compact feed system for the generation of circular polarisation in an antenna and method of producing such system

摘要

The assembly has an asymmetric diplexing orthomode transducer (21) comprising two branches coupled to a main waveguide by two parallel coupling slots. The branches are respectively linked to two waveguides (35, 36) of an unbalanced branched coupler (40). The slots are formed in two orthogonal walls of the waveguide, and linked to the coupler via stub filters (27, 28) and recombination circuits (29, 30). The coupler has two different splitting coefficients that are optimized to compensate for orthogonal spurious components of electric field produced by the asymmetry of the transducer. An independent claim is also included for a method for developing a compact excitation assembly for generating a circular polarization in an antenna.