A Far-Field Calculation subnode is added by default to the Far-Field Domain node and is used to select boundaries corresponding to a single closed surface surrounding all radiating and scattering objects. By default, all exterior boundaries of the Far-Field Domain are selected. If a Perfectly Matched Layer (PML) node has been added before adding the Far-Field Domain, all exterior boundaries of the Far-Field Domain adjacent to the PML are selected. The selection can be edited, but only boundaries adjacent and exterior to the Far-Field Domain are selectable. Symmetry reduction of the geometry makes it relevant to select boundaries defining a nonclosed surface. Also use this feature to indicate symmetry planes and symmetry cuts applied to the geometry, and whether the selected boundaries are defining the inside or outside of the far field domain; that is, to say whether they are facing away from infinity or toward infinity.

Enter a Far-field variable name. The default is Efar.

Select the Symmetry settings — From symmetry plane(s) or User defined.

When a model is reduced with Symmetry Plane features, use From symmetry plane(s) option to adjust far-field calculation automatically. The symmetry plane features have to coincide with one of the Cartesian coordinate planes.

Select as needed the Symmetry in the x=0 plane, Symmetry in the y=0 plane, or Symmetry in the z=0 plane check boxes to use it your model when calculating the far-field variable. The symmetry planes have to coincide with one of the Cartesian coordinate planes.

When a check box is selected, also choose the type of symmetry to use from the Symmetry type list that appears — Symmetry in E (PMC) or Symmetry in H (PEC). The selection should match the boundary condition used for the symmetry boundary. Using these settings, include the parts of the geometry that are not in the model for symmetry reasons in the far-field analysis.

From the Boundary relative to domain list, select Inside or Outside (the default) to define if the selected boundaries are defining the inside or outside of the far-field domain (that is, whether facing away from infinity or toward infinity).

To display this section, click the Show More Options button () and select Advanced Physics Options in the Show More Options dialog box.

Enter an Average operator integration order. The default is 2. The average operator is used when calculating the maximum directivity or total radiated power.

Select the Maximum operator point type — Node point, Integration points, or Lagrange points.

When selecting the Integration points, enter a Maximum operator integration order. The default is 2. When selecting the Lagrange points, enter a Maximum operator Lagrange order. The default is 2. The maximum operator is used when calculating the maximum directivity, maximum gain, or maximum realized gain.