Design & full-wave EM simulation of Ku-band orthomode transducer (OMT)

Abstract

The paper describes the design and full-wave EM simulation of Ku-band (10.7-14.5) GHz orthomode transducer (OMT). The OMT designed is class 2 (symmetric OMT) which has higher fractional bandwidth and cross-polarization isolation than the class 1 OMT. It is realized with Modified Bfifot junction where the tuning pins are replaced with well placed capacitive steps. Moreover septum is four times thicker than conventional class 2 OMT, making it realizable up to 1 THz frequency. Cross-polarization isolation ≥ 80 dB and return loss ≥ 20 dB are achieved in the entire band. Effect of manufacturing tolerances and assembly misalignment are incorporated d the full-wave EM simulation. All the simulation & optimization work is done in industry standard EM Simulation software.