AB Card
This card is used to create a FEM modal excitation, which is the fundamental mode of the associated, infinitely long guided wave structure of the modal port.
On the Source/Load tab, in the Sources on
geometry group, click the 
Modal source (AB) icon.
Figure 1. The AB - Modal port excitation dialog.
Parameters:
- New source
- A new excitation is defined which replaces all previously defined excitations.
- Add to sources
- A new excitation is defined which is added to the previously defined excitations.
- Name of the modal port
- Label of the modal port.
- Magnitude of impressed mode (V/m)
- Magnitude of the impressed mode in V/m.Note: If left empty or set to 0 then the modal port will act as a passive (sink) port for fields incident on the port.
- Phase (degrees)
- Phase of the impressed mode in degrees.