Port Accuracy

Generally, the port accuracy defaults, specified under the Port Options in the Advanced tab of the Solution Setup window, are adequate. You may want improved port accuracy under the following conditions:

• You are interested primarily in the port impedances. Port impedances are computed as part of the port solution.
• You need to lower the noise floor to catch S-parameters that are expected to be in the -70 dB range.

The port accuracy settings are only used for port adapt. If those settings are modified after port adapt nothing will happen. Therefore, to specify new port accuracy settings, add another solution setup and generate a new solution.

Refining the mesh at the ports causes HFSS to refine the mesh for the entire structure as well. This occurs because it uses the port field solutions as boundary conditions when computing the full 3D solution. Therefore, specifying too small a port field accuracy can result in an unnecessarily complex finite element mesh.