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A W-band Orthomode Transducer (OMT) has been developed for Korean VLBI Network (KVN) polarization observation. The\udOMT design was based on E-plane split-block technique using septum structure. 3-dimensional electromagnetic simulation\udwas fully employed to optimize the performance of the OMT. Measurements of the fabricated OMT show that the return losses\udfor the vertically and horizontally polarized modes are better than -20 dB across 80 ~ 108 GHz and the insertion losses for the\udboth modes are less than 0.47 dB. The cross-polarization level of the OMT is less than -30 dB. The bandwidth of the developed\udOMT is estimated as around 30%

A Broadband W-band Orthomode Transducer for KVN Polarization Observations