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SUMMARYThis paper presents a full wave method for the determination of the mathematical model of a 3D waveguide structure in the form of the pole expansion in the s-plane of its generalized admittance matrix. The method is based on a boundary integral-resonant mode expansion approach. By the introduction of appropriate state-variables, the method leads to the pole expansion by solving a linear generalized eigenvalue problem, like in the well-known techniques used up to now in frequency/time domain modelling based on "nite di!erence or "nite element methods. With respect to these methods we have the advantage of a signi"cant reduction in both memory allocation and computing time. Two examples show the accuracy of the results and the e$ciency of the method.

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