Learning Forum

[shanyco]

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

 

[Amrita Pati]

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