An orthomode transducer (OMT) operable in a broadband (e.g. 30%), including a frequency above ~30GHz, with an isolation better than -50dB, cross-polarizations better than -40dB, an insertion loss between -0.1 and -0.3dB for both polarizations, and return losses better than -25dB can be produced substantially or entirely from CNC machining, comprises a turnstile for coupling a polarization diplexed waveguide with four waveguide paths; and two E-plane Y junctions each for coupling initially oppositely directed pairs of the waveguide paths such that each waveguide path has a same electrical length from the turnstile to the E-plane Y junctions as the waveguide path with which it is paired, such that the OMT is formed in 3-6 blocks, including a single block having a substantially planar mating surface that includes the matching feature, and defines one side of initial segments of the four waveguide paths. Reproducibility of these OMTs has been shown.
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