mmwave RF SPDT switch Simulation

- May 22, 2023 at 11:24 am
  
  Jacob Randall
  Subscriber
  
  I posted this questioj over at the general forum for a lumped port at mmwave at HFSS. i found it to be a problem at mmwave when the lumped port is electrically large.
  https://community.ansys.com/?status/49587-49587-1684239799/
  
  Help with the posed questions is much appreciated.
- May 31, 2023 at 9:13 am
  
  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.
- June 5, 2023 at 7:20 am
  
  Kendrick Werner
  Subscriber
  
  I appreciate your informing me of this. I'm so glad I stumbled onto this excellent piece the backrooms

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