BFAST source

- October 1, 2023 at 3:18 pm
  
  shanyco
  Subscriber
  
  Hello,
  I'm using the "grating s parameters" object with 'BFAST' settings (simulating different oblique angles) for a plane wave incidenting a periodic structure.
  In many cases I'm getting this warning -
  And the transmission data does not seem reasonale at all (it looks like a delta function with a peak of 10^6, sometimes 10^8...).
  
  Can you help me understand this warning? How to overcome it?
  
  thank you very much,
  Shany
- October 2, 2023 at 10:31 pm
  
  Amrita Pati
  Ansys Employee
  
  Hi Shany,
  Is there any chance you are using a polarization other than s or p? I believe the grating s parameters analysis group can only handle s and p-polarized sources. So, if the "polarization angle (degrees)" field in the plane wave source is anything other than 0 (p-polarized) and 90 (s-polarized) then the analysis group will most likely give you inaccurate results.
  Regards,
  Amrita