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Mismatch between eigenmode simulation and driven modal

- September 8, 2026 at 7:56 am
  
  Igor Broeckel
  Subscriber
  
  I wor for the first time with ANSYS and need some help. Any input is appreciated!
  
  I try to design two coupled microwave cavities. A ring waveguide is excited via an antenna and the signal is fed into a cylindrical main cavity via round coupling holes that connect the two cavities.
  
  I started by designing both cavities separately and use the eigenmode simulation in order to tune the dimenions of the cavities to match the desired mode and resonance freqeuncy.
  
  As soon I couple the two cavities and run the eigenmode simulation I get a resonance that is slightly off. But way more confusing is the fact that when I run the driven modal simulation (of the coupled cavities) the S11 dip is at a different freqeuncy then the mode in the eigenmode simulation.
  
  Why is that? I would assume that the resulting mode in the eigenmode simulation should be at the same freqeuncy as in the driven modal?

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