An orthomode transducer (OMT) configured as a compact three port septum polarizer waveguide where one of the three ports is configured to propagate linear orthogonally polarized signals, and an edge of the septum facing that port has a profile including three or more segments with respective facing edges spaced at diverse respective distances from the one of the three ports that is configured to propagate linear orthogonally polarized signals. The three or more segments include one or both of a notch and a protrusion.
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