An inclusive analysis of inductive dielectric and/or metallic discontinuities in a rectangular waveguide

Abstract

An inclusive method is introduced for the analysis of different types of inductively loaded rectangular waveguides with dielectric and/or metallic obstacles. The proposed method utilizes the efficiency of the generalized scattering matrix (GSM) method on scattering analysis and the flexibility of the method of moments on problem configuration. The inductive metallic discontinuities are treated as a dielectric medium with high conductivity and the scattering analysis is accelerated by several cost reduction attempts in conjunction with GSM method and procedure of method of moments. The examined approach is tested against several structures including a metal insert filter, an H-plane filter, and a dielectric-metal obstacle-loaded waveguide both for the dominant mode region and the double-mode region. The convergence analyses on the number of calculated modes and the size of the discretized cells in the computational procedure are carried out for a comprehensive explanation of the numerical analysis. The accuracy of the method is compared to commercial software based on the finite element method. The proposed method is particularly competent for the frequency analysis of metallic and inhomogeneous dielectric discontinuities horizontally aligned in cuboid shapes.

Integral equation analysis of multiport H‐plane microwave circuits by using 2D rectangular cavity Green's functions accelerated by the Ewald Method

“…This last work requires the segmentation of the original problem in a set of individual building blocks, represented by a generalised admittance matrix (GAM) obtained by BI‐RME, that are conveniently combined by a specific algorithm [27]. On the other hand, an integral equation method, which was able to find the circuit response of H‐plane circuits containing inhomogeneous dielectric posts along with metallic objects, was recently presented in [28]. Nevertheless, this numerical technique was strictly limited to cuboid geometries, significantly affecting to its efficiency the characterisation of curved arbitrarily shaped objects.…”