A cavity is a box with perfectly conducting walls.
- Select a signal layer on which the cavity lies.
It must lie between two negative signal layers.
- From the Draw menu, select Cavity to open the Cavity Definition window.
- If chosen, change the cavity’s name and color.
- Select a top negative signal layer from the Top Layer list.
By default, the nearest negative signal layer above the current signal layer is selected.
- Select a bottom negative signal layer on the Bottom Layer area.
By default, the nearest negative signal layer under the current signal layer is selected.
- Enter the Width and Height of the cavity.
- Alternatively, click Autosize All to fit the cavity in the geometry of the two negative signal layers. Or click Autosize Selection to fit the cavity in the geometry of a selected object.
- Click OK.
The cavity is listed in the Project Tree under Cavities.
Guidelines for Drawing a Cavity
Keep the following things in mind when creating a cavity:
- Cavities can only be defined between two negative signal layers.
- Cavities cannot be defined between two negative signal layers when there is an intervening negative signal layer between them. However, create two cavities stacked on top of one another.
- Edge ports must touch the cavity wall. To place sources inside a cavity, use gap sources or probe ports.
- Only gap sources and probe ports can be defined both inside and outside cavities at the same time.
- Cavities and finite negative signal planes cannot be defined in the same model.