An orthomode transducer (OMT) is a waveguide component. It is commonly referred to as a polarization duplexer. Orthomode transducers serve either to combine or to separate two orthogonally polarized microwave signal paths. One of the paths forms the uplink, which is transmitted over the same waveguide as the received signal path, or downlink path. Such a device may be part of a VSAT antenna feed or a terrestrial microwave radio feed; for example, OMTs are often used with a feed horn to isolate orthogonal polarizations of a signal and to transfer transmit and receive signals to different ports
This OMT is designed to operate at 20.9 GHz (k-band) and 29.9 GHz (ka-band). WR42 is used as input square cross section waveguide that supports both k and ka-band frequency ports. WR28 is used to couple one polarization signal at 29.9 GHz.