A compact planar orthomode transducer

Summary form only given, as follows. The design of a compact orthomode transducer (OMT) using substrate integrated waveguide technology (SIW) is presented. The orthomode signals originate from a square waveguide and are coupled to four SIW lines through four wide slots placed on the end wall of the square waveguide and they are combined using a simple planar configuration to output two uncoupled orthomode signals. A back-to-back OMT having an operating frequency of 30 GHz was fabricated. Design guidelines are also provided.