FEM Parameters

Optional parameters can be used with the finite element method (FEM) to save memory and runtime in specific cases.

On the Solve/Run tab, in the Solution Settings group, click the  Solver Settings icon. On the Solver Settings dialog, click the FEM tab.

Figure 1. The Solver Settings dialog (FEM tab).
Decouple from MoM (use FEM absorbing boundary condition)
This option removes the influence of the FEM region (the tetrahedral elements and any conducting surfaces on their boundaries) on the MoM solution. The runtime and memory will be less compared to a fully coupled (default) solution. Closed FEM problems (for example, completely confined by PEC and / or modal port boundaries such as waveguides) are highly suitable, automatically detected and the MoM solver will be deactivated. For other types of problems this option should be used with caution. For example, the input impedance of a dipole antenna close to a human head, where the dipole is solved using the MoM and the human head using FEM, will (incorrectly) be the same as that of the MoM dipole in free space.
Tip: Use this option if the MoM and FEM regions are electrically far apart.
Element order
This option allows you to specify the element order for the model. Use First order only (reduced accuracy) to reduce the required memory and run-time for regions with fine details where the geometric details (and resulting mesh) are very fine.
Note: Use First order for very fine meshes to reduce memory and runtime.