Asymmetric double-band orthomode transducer with high polarization purity

An asymmetric and very compact orthomode transducer for dual-frequency-band applications with a high polarization purity is proposed and analyzed by m eans of a hybrid full-wave characterization based on the generalized admitt ance matrix (GAM) and the generalized scattering matrix (GSM) obtained with mode matching. An accurate, robust, and efficient computer code based on t his procedure has been developed and used for the design of a dual-frequenc y OMT in the Ku-band. The numerical/experimental results for the structure confirm its excellent performance, i.e., low return and insertion losses, h igh isolation, and especially, high polarization purity. (C) 1999 John Wile y & Sons, Inc. Microwave Opt Technol Lett 21: 265-267, 1999.