31 Single resonator waveguide filter

This example is available in .../QW-3D/Prony/Ex1/ex1.QWPro in the QW-Modeller examples directory and can be loaded using File®Open Examples... command from main menu.

General Description

The structure is a resonator made of two thin irises placed in a rectangular waveguide. This is an example of a very simple resonant structure, which shows the weakness of traditional Fourier transform processing of circuits with long impulse response. For those kind of problem QProny module is recommended.

Geometry

The filter is made on a 20 mm x 10 mm rectangular waveguide and its length is 67 mm.

Post Processing

The |S21| characteristic obtained from Fourier postprocessing (red) and QProny module (blue) after about 2500 iterations.

The |S21| characteristic obtained from Fourier postprocessing (red) after 25000 iterations and QProny module (blue) after about 2500 iterations.