Creating a Waveguide Port

Apply a waveguide port to a face.

  1. On the Source/Load tab, in the Ports group, click the  Waveguide Port icon.
    Figure 1. The Create Waveguide Port dialog (Specification tab).

  2. Click the Specification tab.
  3. In the Face field, use point entry to specify the face using one of the following workflows:
    • In the 3D view, click on the relevant face.
    • In the details tree, click on the relevant face.
    A port direction and reference direction are automatically defined.
If the port direction is not correct, you can change the direction.

The port direction (indicated by a blue and red arrow in the centre of the port face) indicates the orientation of the port. When a waveguide excitation is applied to the port, impressed/excited modes will be launched in the direction of the red arrowhead. Waveguide modes which propagate toward the port in the opposite direction to the port direction will be absorbed/received at the port face. For a typical application, the port direction should therefore be set such that the red arrow points into the waveguide irrespective of whether the port is used as a source or a sink/load.

  1. [Optional] Clear the Port direction opposite to the face normal check box to change the port direction to be in the same direction as the face normal.
If the reference vector is not correct, you can specify the reference vector.
  1. [Optional] Under Reference vector, specify the reference vector.
  2. In the Label field, add a unique label for the waveguide port.
  3. Click the Advanced tab.
Figure 2. The Create Waveguide Port dialog (Advanced tab).

When the number of modes to be considered is not specified, Feko calculates the number automatically.
  1. [Optional] To specify the number of modes, select the Manually set the maximum modal expansion indices check box and specify m and n.
  2. Select the Use legacy magnitude convention check box to use the legacy definition of mode-dependent units (for example, for TE-mode it is A/m; for TM-mode it is V/m).
    Note: The default is to use the power-based definition of magnitude which is common to all mode types.
  3. Click Create to create the waveguide port and to close the dialog.