Double-Ridged Waveguide Orthomode Transducer for terahertz wireless transmission link

To meet the demand of large transmission capacity in high-speed terahertz wireless transmission link, a broadband Orthomode Transducer (OMT) working at 275-296GHz is designed based on double-ridged waveguide junction. It is implemented in split-block using high precision CNC milling. The measured results shows that its return loss is less than -15dB and insertion loss is less than 3dB, and the polarization isolation is higher than 20dB, which can gurantee its applications in the dual-polarized antenna.