Why does this Frequency Selective Surface show odd behavior at high frequency?

- March 29, 2022 at 3:37 pm
  
  ixg90
  Subscriber
  
  I'm simulating a metal-mesh optical lowpass filter. I've drawn one unit cell of the filter (seen below). I've assigned primary/secondary boundaries to the sides of the airbox, and floquet ports to the top/bottom. I'm running an interpolating frequency sweep from 10 GHz to 1 THz.
  
  As you can see from the S-parameter plot, the filter behaves as expected at frequencies below about 600 GHz, but contains significant ripple above this frequency. Are my simulation settings causing this?
- April 1, 2022 at 12:32 pm
  
  Praneeth
  Ansys Employee
  
  It looks like there is some issue in the setup.
  Did you verify that the solution is converged?
  Please let us know which type of frequency sweep you are using. If it is interpolating then did you verify it is converged or not?
  All the very best Praneeth.
- April 5, 2022 at 5:32 pm
  
  ixg90
  Subscriber
  
  Hello,
  Thanks for your reply. I ran an interpolating frequency sweep. The solution has converged.

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