I sweep diameter of hole but s21 didn't change
In the schematic page, the filter has dc voltages for tuning the varactors. I want to connect some varactors to GND
Should I connect ground of dc sources to ac sources? I mean the ground of varactors is different from ground of via hole?
I should transfer layout from Momentum to Schematic page for connecting varactors. I don't do simulation in Momentum page I do it in Schematic.
For the Momentum setup, Bigboss is right: you need to specify 0 Hz lower frequency. For this small layout with 4 vias, Momentum RF mode or Microwave mode are both ok.
RF mode does not takes the lowest frequency as 0Hz, it takes very close to DC but not 0Hz.That's my observation.
In dc annotation shows that via hole is not 0 V.
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