Modifying PML Boundaries

You can modify parameters of PML boundaries through the PML Setup Summary dialog box. You can also modify the dimensions of PML boundaries by editing the History tree properties for the original object for which you assigned the PML boundaries.

To modify dimension properties for the original PML object:

1. Go to the History tree and open the hierarchy under the original PML base object.
2. Select the CreateBox command for each part of the geometry you want to modify.
3. In the Properties dialog for that geometry command, edit the properties for XSize, YSize, or ZSize as required.

The changes to the CreateBox parameters apply to the associated PML objects. Note that you can create variables to parameterize these properties.

To modify PML parameters:

1. Make sure that nothing is selected in the 3D Modeler window.
2. Click HFSS>Boundaries>PML Setup Wizard.

The Summary dialog box of the PML Setup wizard appears. By default the Show Objects in groups box is not checked. A table shows each PML Group, its thickness, and material status. Checking the box causes the table list the objects under each group.

3. If more than one group of PMLs were defined, select the PML group you want to modify from the table.
4. Modify the PML parameters.

A Radio button lets you select either the Free Radiation minimum frequency and units, or the Guided Wave propagation constant at a minimum frequency.

You can also specify a Minimum Radiating distance and units.

5. If you make changes, click Update.

This performs the update and enables the Recalculate Materials button.

6. Click RecalculateMaterials to apply the updates.

Ansys Electronics Desktop automatically recalculates and assigns the appropriate PML materials to the objects in the PML group.

7. Click Finish.
   Note:

   If objects are modified after PMLs are created, the PML materials will be invalid and must be recalculated in the PML Setup Wizard. For example, if the material of the PML base object is modified, the associated PML materials must be recalculated in the PML Setup Wizard.