A finite element method (FEM) modal port
is used to apply a port to a flat face on the boundary of a FEM region. A FEM modal
port essentially represents an infinitely long guided wave structure (transmission line),
connected to a dielectric volume modelled with FEM.
The FEM modal port can be excited with the
fundamental mode of the associated guided wave structure, or it can act as a passive
port. S-parameters can be computed between the fundamental mode of the FEM modal port and other sources in the model.
Figure 1. The display of the FEM modal port in the
3D view.
