Horn Antennas Analysis Using a Hybrid Mode Matching-Auxiliary Sources Technique

A Hybrid technique for the analysis of pyramidal horn antennas is proposed in this paper. The transition from a relatively small feeding waveguide to a larger radiating aperture is analyzed using the mode matching technique, while the discontinuity between the horn and free space is analyzed using the method of auxiliary sources. The resulting procedure is very stable and accurate while the computational time is quite small since all the coupling integrals involved in the mode matching are evaluated analytically.