OMT design based on Boifot Orthomode junctions for satellite communication applications in the Ku Band

Abstract

An Ortho-mode transducer (OMT) using Bøifot orthomode junction is presented for obtaining the maximum wave quality in antenna feeds with very wide performance. The proposed junction is based on the Bøifot configurations, having two symmetry planes for keeping the isolation between orthogonal polarizations and the higher order modes control. The designed circuit provides a combined effect: good matching with very significant size reduction, especially in the transversal plane, reducing mass in satellite systems and allowing feeding important antenna arrays. A Ku-band OMT is presented in order to illustrate the advantages of the introduced junction. The design covers the Ku band 10-15 GHz with more than 25 dB return losses and an insertion losses less than 0.2 dB for both polarizations.