Analytical Approach to Wave Scattering in Waveguide Junction with Conducting Cylindrical Posts

TL;DR

This paper introduces an improved analytical method for wave scattering analysis in waveguide junctions with conducting cylindrical posts, enhancing computational efficiency and accuracy over existing techniques.

Contribution

The paper presents a novel mode matching algorithm using local projection functions that improves numerical conditioning and reduces computational boundary requirements.

Findings

Method shows better convergence and accuracy in tests.

Validated against finite element simulations with consistent results.

Applicable to complex waveguide structures like microwave filters.

Abstract

A new approach for analyzing waveguide junctions containing conductive cylindrical objects is proposed. The algorithm is based on mode matching technique using local projection functions, which improves the numerical conditioning of the problem. Moreover, the approach enhances computational efficiency by reducing the boundary where the numerical integration is required. Both convergence and accuracy of the method were tested by using several examples, including multi-section microwave filters, and validated through comparison with results obtained using the finite element method implemented in a commercial full-wave simulator.