Home Forums Usage Crystal simulation wit S parameters not correct

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  • #7065
    stevegeers
    Participant

      I am trying to simulate a crystal filter using measured S parameters. There are a couple points in the response that indicate that the passive circuit has gain. The points are interpolations between the points in the  S parameter file. All points not in the sharp peaks agree with measured data on actual hardware. I have seen this in other programs in the past when modeling high Q circuits. It is usually a numerical accruacy issue due to rounding. Is there any way to adjust the numerical accuracy or anything else in the simulation to resolve this?

      #7085
      Carsten
      Participant

        similar things happen in CST, when S-Params from an 3DEM-Simulation need to be interpolated. In that case it helps to change s-param interpolation from polar to cartesian domain.

        Qucs offers similar options in touchstone file component. maybe that helps?

         

        • This reply was modified 2 months, 2 weeks ago by maelh. Reason: Convert all remaining http links to https links
        #7099
        stevegeers
        Participant

          Changing to cartesian interpolation fixed the issue. Thanks.

          #7101
          Carsten
          Participant

            @Michael: Vlt. ließen sich solche Fälle automatisch erkennen und Qucs könnte eine Warnung ausgeben?

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