アプリケーションギャラリ

This model demonstrates three different ways to find the eigenfrequencies of a rectangular metallic cavity.

The first method uses an eigenfrequency study step together with the Electromagnetic Waves, Beam Envelopes interface. Here, it is important to define a wave vector for the physics interface that is independent of the eigenfrequency (eigenvalue). Otherwise, the accuracy of the solution will be bad.

The second method uses a nonlinear eigenfrequency setup, together with the Electromagnetic Waves, Beam Envelopes interface. This method is also used in the Wave Optics Module Application Library model Transverse Modes for a Symmetric Laser Cavity and is included for comparison with the first method.

The third method uses an eigenfrequency study step together with the Electromagnetic Waves, Frequency Domain physics interface. It is demonstrated that a much finer mesh is required for this physics interface to obtain the expected eigenfrequencies.

A second model is also included, where the simple rectangular cavity has been slightly modified using two central metallic protrusions. This perturbs the modes and requires finer meshes, but all three methods produce similar results.