Very compact ortho-mode transducers with double septum configuration

TitleVery compact ortho-mode transducers with double septum configuration
Publication TypeJournal Article
Year of Publication2006
AuthorsRuiz-Cruz, J. A., J. R. Montejo-Garai, J. M. Rebollar, C. E. Montesano, and M. J. Martın
JournalMicrowave and Optical Technology Letters
Date PublishedApr.
Keywordsgeneralized admittance matrix, generalized scattering matrix, mode-matching, ortho-mode, septum
AbstractThis paper describes the analysis and design results of a very compact ortho-mode transducer (OMT) for dual-polarization communication systems. The presented configuration introduces an additional double septum in the conventional structure, not reported previously, which provides a number of advantages for some of the usual requirements of this type of OMTs. Specifically, the double-septum configuration enhances the performance of the OMT in two interrelated aspects: (i) it contributes to reduce the size of the axial branch of the OMT preventing the power transfer between horizontal modes at the axial and common ports; (ii) it facilitates the matching of the horizontal polarization between the lateral and common ports. The presented design leads to a very interesting structure for coping with competitive specifications. The proposed structure is validated using a prototype onboard the Hispasat 1D satellite.