Design and simulation of a multiband orthomodetransducer in k/Ka band for satellite communications

Abstract

This paper describes the design and simulation of a waveguide multiband Orthomode Transducer (OMT) from 15 to 32 Ghz. The OMT is based on a symmetric backward coupling structure and has a square common waveguide input port and two single mode rectangular waveguide outputs. The coupling structure is located in the common rectangular waveguide and stepped to get the desired operating bands. The device was designed and optimized using Mician μwave wizard and CST Microwave Studio. From 15 to 33 GHz the simulated input return loss was about 30 dB, the isolation between the output ports was better than 40 dB. The circuit is designed regarding standard waveguide technology to meet feed chain requirement for antenna in satellite communications in wideband frequencies.