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Port 2 supports additional propagation and/or slow attenuation modes

- May 13, 2026 at 9:42 am
  
  jinquan
  Subscriber
  
  Hello, I have always encountered the prompt message that Port 2 supports additional propagation and/or slow attenuation modes, its attenuation is 5.242e+00, and its propagation constant is 6.482e+02, and the simulation speed is very slow, in which my solution frequency ranges from 0.1GHz to 80GHz. I would appreciate it if you could help me solve it.
- May 14, 2026 at 12:24 am
  
  Takeshi Itadani
  Ansys Employee
  
  This message appears when the Wave Port size is too large for the wavelength determined by the analysis frequency. Higher-order modes are occurring, making the analysis unstable and preventing a correct analysis. Please reduce the size of each side and diagonal of the Wave Port to less than half the wavelength determined by the maximum frequency you want to analyze. For 80GHz, this would be less than approximately 1.8mm.
- May 14, 2026 at 1:14 am
  
  jinquan
  Subscriber
  
  Thank you for your help. I have solved this problem.

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