COMSOL 6.4 - Port Mode Field Variables

Port Mode Field Variables

The Port, Diffraction Order, Orthogonal Polarization, and Periodic Port nodes add the following variables related to port mode fields


Name	Description
emw.tEmodeC_K	Port tangential electric mode field, C-component
emw.normtEmode_K	Port tangential electric mode field norm
emw.Enmode_K	Normal electric boundary mode field
emw.EmodeC_K	Electric mode field, C-component
emw.normEmode_K	Electric mode field norm
emw.tHmodeC_K	Port tangential magnetic mode field, x-component
emw.normtHmode_K	Port tangential magnetic mode field norm
emw.Hnmode_K	Normal magnetic boundary mode field
emw.HmodeC_K	Magnetic mode field, C-component
emw.normHmode_K	Magnetic mode field norm
emw.beta_K	Propagation constant
emw.neff_K	Effective mode index

In the table above, the suffix C denotes the vector component (x, y, and z in 2D and 3D, and r, phi, and z in 2D axisymmetry). The suffix K represents the port name.

The electric mode field is defined from the tangential electric mode field and the normal component of the electric mode field as

emw.EmodeC_K = emw.tEmodeC_K + emw.Enmode_K*emw.nC,

where emw.nC is the C-component of the normal to the port boundary.

The magnetic mode field is defined from its tangential and normal components in the same way as the electric mode field.

For most port types, the mode fields and the propagation constant are defined from analytical expressions or as a user input. However, for ports the electric mode fields and the propagation constant are solved for using a study step. Similarly, for the port type, the tangential mode fields are solved for using a study step.