Application of the BI-RME method to the analysis of piecewise-homogeneous waveguide components

This paper presents a novel technique for the numerical modeling of piecewise-homogeneous waveguide components. The component is segmented into homogeneous boxed building blocks, and the generalized admittance matrix of each building block is determined by the Boundary Integral-Resonant Mode Expansion (BI-RME) method, using the Ewald technique to calculate the Green's function of the box. The frequency response of the whole component is obtained by cascading the admittance matrices of the building blocks. Two examples demonstrate the capabilities of the proposed algorithm.