Scattering from multi-dielectric insets in rectangular waveguides by a novel state-space integral-equation method

Recently, we introduced a novel technique, based on a state-space/integral-equation (SS-IE) approach, which proved very efficient for the numerical modeling of scattering from metallic or dielectric insets in rectangular waveguides. This paper outlines the extension of this technique to the case of a multi-dielectric inset, which is most interesting for the design of high-Q dielectric resonators employed in filters and diplexers. The SS-IE method shares the efficiency of IE methods and the advantages of the state-space formulation of mathematical models (simultaneous modeling in the frequency- and time-domain [J.E. Bracken et al., 1998], macromodeling by well-established Model Order Reduction (MOR) techniques e.g., [R. Freund, 1998]). Due to the limits imposed to a conference paper, we limit ourselves to present the basic philosophy of the algorithm without going into details.