Non-Reciprocity in EME

- June 6, 2023 at 2:05 am
  
  Wender Daniel
  Subscriber
  
  I am runing a simulation in the MODE EME solver with 2 ports.
  In all section I have dielectric waveguides.
  In the reflection results, I am getting different values for s11 and s22 that were not expected.
  See figure below.
  Can you give me an insight about what can be happening?
  
  Thank you,
- June 7, 2023 at 11:28 pm
  
  Guilin Sun
  Ansys Employee
  
  Somehow the reply yesterday did not show here.
  Since EME does not enforce the reciprocity, due to numerical errors of discretization and the field continuity such difference can happen. Further reducing the difference takes more time from converging testing, and it is not obvious which factors dominate this.
- June 11, 2023 at 8:02 pm
  
  Wender Daniel
  Subscriber
  
  Hi Giulin, thank you for your reply!
  Changing the EME tolerances can reduce the difference?
  
  Best regards
- June 12, 2023 at 3:50 pm
  
  Guilin Sun
  Ansys Employee
  
  https://optics.ansys.com/hc/en-us/articles/360034917533-Understanding-EME-error-diagnostics
  those tolerances are subtle to define, but can be helpful. At the same time you will need to check the diagnosis and see if it violates some physics too much.
  Since the difference of the non-reciprocity is small, it can be challenge to reduce to very small level without trial and error.

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