ABSTRACT This paper presents an octave‐band orthomode transducer (OMT) based on ridged waveguide technology, designed and analysed with both T‐junction and Magic‐T configurations for performance comparison. The results demonstrate that the Magic‐T junction provides superior performance, owing to its inherent characteristics, and outperforms conventional T‐ and Y‐junctions commonly employed for signal recombination in OMTs. The proposed OMT, integrated with a Magic‐T and fabricated using CNC machining, achieves octave‐band operation from 20 to 40 GHz (2:1). This design addresses fabrication and wideband performance challenges by minimising the number of layers required for CNC machining and by identifying an optimal approach for integrating ridged waveguides throughout the overall OMT structure. The measurement results confirm the OMT's suitability for wideband applications and demonstrate its potential for possible future integration into the next‐generation Very Large Array (ngVLA) radio telescope.
Tasouji et al. (Thu,) studied this question.