Design of a Wideband Circularly Polarized Orthomode Transducer for 5G Applications

Abstract

A wideband septum-based orthomode transducer (OMT) is designed to characterize and measure dual circularly polarized 5G communication systems. The OMT is designed for the n260 (37–40 GHz) and n259 (39.5-43.5 GHz) bands. The fabricated OMT has 20% fractional bandwidth (36–44 GHz) with a measured return loss and isolation better than 18 dB. The OMT achieves a simulated cross polarization discrimination (XPD) and axial ratio (AR) of 42.5 dB and 0.45 dB respectively. Good agreement between simulations and measurements is obtained.