A 230 GHz Orthomode Transducer with Simple Fabrication Steps

This paper presents the design of a J-band orthomode transducer, featuring a simple structure for ease of fabrication using CNC machining. Two orthomode transducers are fabricated and measured which are shown to achieve an operational bandwidth of more than 7%, over which the return loss at all ports is better than 10 dB, and cross-polarization isolation is better than 30 dB. The insertion loss is minimized to an average between 2 and 3 dB using electroless gold plating.