Electronics

Electronics

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

    • 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?

    • 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.
    • ixg90
      Subscriber
      Hello,
      Thanks for your reply. I ran an interpolating frequency sweep. The solution has converged.

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