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The Multimode Equivalent Network (MEN) formulation has been traditionallyemployed for the efficient and accurate analysis of waveguide devices. In thispaper, we extend the use of the MEN to the analysis of zero thickness,multilayer planar circuits in a metallic enclosure. The formulation isdeveloped for arbitrary shape metallic areas and includes both internal andexternal ports in the transverse plane. The BI-RME method is applied to analyzethe arbitrary shaped metallizations and to compute the coupling integralsneeded to solve the corresponding integral equations. On this basis, typicalshielded microstrip circuits of complex geometries, are analyzed in the commonframe of the MEN technique. To validate the theoretical formulation, severalshielded filtering microstrip structures are analyzed, showing good agreementwith respect to both other commercial tools and experimental measurements.

Novel Rigorous Multimode Equivalent Network Formulation for Boxed Planar Circuits with Arbitrarily Shaped Metallizations