A Novel Metamaterial-Based Orthomode Transducer With Symmetric Port Parameters

This article presents a novel metamaterial-based orthomode transducer (Meta-OMT) with symmetric port parameters, surpassing those of conventional OMTs. Using the polarization modulation properties of metamaterials, this design achieves complete port symmetry, enabling all three ports to serve as input terminals for the OMT. By harnessing the high polarization selectivity of metamaterials, the isolation of cross-polarized signals is significantly enhanced. Within the operating frequency range of 9.4–10.6 GHz, this Meta-OMT achieves low insertion loss ranging from 0.1 to 0.5 dB and facilitates efficient signal transmission. Moreover, it exhibits exceptional isolation capabilities, with isolation levels exceeding 40 dB for both co-polarization and cross-polarization signals and reaching 50 dB in 80% of the operating frequency band.