Devin Crawford
Ansys Employee

Hi Jacob,

Without additional information, your setup looks correct. The reference impedance of the ports in HFSS does not impact matching, but rather is the impedance used for measurement of the S-parameters. 

The port definition in HFSS should be consistent with the ports used to create the SMD model s-parameters. In your case, the reference is the top ground layer and the signal pins are on the same layer. Identical to the ports you defined - so all is good.

If you're unsure, you may try using the reciprocal network to create a virtual test fixutre, then extract the s-parameters from your HFSS project to extract only the switch model. You should get something very close to the original s-parameters.