Mesh
The mesh automatically aligns to the geometry. In addition, it needs to resolve the local wavelength and the skin depth for each material domain. It is recommended to use a maximum mesh size that is at a fifth of the local wavelength (at the maximum frequency) or smaller. This can be done by defining the maximum mesh size per domain using a Size feature.
Free Tetrahedral 1
1
In the Mesh toolbar click Free Tetrahedral .
2
Right-click Free Tetrahedral 1 and choose Size .
3
Go to the Settings window for Size. Under Geometric Entity Selection from the Geometric entity level list, select Domain.
4
Select Domain 1 only. This is the domain filled with air inside the waveguide.
5
Under Element Size, click the Custom button.
6
Under Element Size Parameters, select the Maximum element size checkbox. Enter 1.5e-2 in the text field.
Size 2
1
Right-click Free Tetrahedral 1  and choose Size . A second Size node is added to the sequence.
2
Go to the Settings window for Size. Under Geometric Entity Selection from the Geometric entity level list, select Domain.
3
Select Domain 2 only. This is the ferrite post domain.
4
Under Element Size, click the Custom button.
5
Under Element Size Parameters, select the Maximum element size checkbox. Enter 4.5e-3 in the text field.
6
In the Settings window for Size click Build All .
The node sequence in the Model Builder and the mesh should match the figure below.