Análise numérica de guias de onda a partir do método das diferenças finitas no domínio da frequência

Abstract

The analytical analysis of waveguides for simple geometries, such as rectangular and circular are available in the literature. For complex structures, the boundary conditions applying in the wave equation solution demand great effort. The study of arbitrary cross-section complex structures requires to use of numerical methods. This work presents the analysis of metallic waveguides, filled by homogeneous material lossless with a perfect electrical conductor (PEC) walls using the finite-difference frequency-domain (FDFD) method. The numerical formulations in rectangular and cylindrical coordinates are presented. The cut-o_ frequencies of the transverse electric (TE) and transverse magnetic (TM) modes for several types of waveguides, such as a rectangular, single ridge, L-shaped, truncated rectangular, coaxial rectangular, circular and coaxial circular, are numerically calculated. Additionally, it provides longitudinal electromagnetic fields illustration. The validation employs the commercial software Ansys HFSS to confirm results. The proposed approach obtained good agreement when compared with computational results and less memory usage.