L-band orthomode transducer for Shanghai 65m radio telescope

Orthomode transducer which is the essential passive component of radio front-end constitutes a simple and compact device for splitting two perpendicular linear polarized signals and vice versa. In this paper, an L-band (1.25 to 1.75 GHz) quad-ridged orthomode transducer terminated by two orthogonal rows of shorting pins is designed and implemented with a strong concentration on assembly and suppression of higher-order modes and trapped-mode resonances. It is shown that experimental and simulated results are in good agreement which validates the proposed design procedure and approach.