A method for the analysis of multiple scattering problems, valid both for open-space and guided problems is presented in this paper. The scatterers are first characterised individually by means of a transfer function, and next the coupling among objects is solved in an iterative way. The restrictions that must be observed at each iteration have been thoroughly determined for an correct use of the method in guided problems. Results for a 2-D horn and for a rectangular waveguide with an inductive circular post are presented.

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