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An analysis method for circular horns with dielectric inclusions is discussed. The method is based on 2-D high order finite element method coupled to mode matching. Comparison with results available in the literature and with experimental data on a vacuum window horn, in a typical radio astronomy configuration, validates the accuracy and efficiency of the method developed. Index Terms--Bodies of revolution (BoRs), finite element method (FEM), horn antennas.

A simple and efficient perturbative approach to analyze the electromagnetic coupling among circular horns is proposed in this paper. The method is based on an analysis tool which combines two different techniques: a mode matching (MM) technique for the propagation inside the horn and a method of moments (MoM) technique for the radiation of the horn taking into account the external part of all the horns of the cluster. The resulting linear system is solved via a very simple iterative procedure in which one can easily control the number of additive terms until the convergence is reached. The method can analyze arbitrarily large horn clusters with moderate computer resources. One of the main benefits of the new procedure is that one can exploit programs developed to analyze stand-alone horns also to evaluate the electromagnetic coupling. Index Terms--Circular corrugated horns, electromagnetic coupling, focal plane array, perturbative approach.

In this paper, a brief description of the line-integral formulation of mode matching is recalled, and the analysis is extended to the case of a TEM mode, normalization integrals, and degenerate eigenvalues. Index Terms--Mode matching, waveguide scattering problems.

The application of improved surface integral calculations to junction characterization in cavity filter designs is not a very unique proposal, although it promises a 50% reduction in the time required to evaluate coupling integrals in mode-matching methods. The single original contribution of the proposal is the application of a method for analyzing coupling between circular cavities through rectangular irises.