Convergence of Numerical Solutions of Open-Ended Waveguide by Modal Analysis and Hybrid Modal-Spectral Techniques.

Two different methods are considered to deal with open-ended waveguides with infinite metallic flange. The first one, Modal Analysis, is valid only when the aperture is radiating into a lossy media. The second one is based on a hybrid modal-spectral technique, and it is valid for any media with or without losses.