September 13, 2023 at 12:02 am
Devika Padmakumar Nair
Ansys Employee

Hello, I am not seeing any bug. Can you restart the FDTD and try again? 

I tried with a ring with radious 700 and I am getting proper index result. Please specify the dimentions and more details when you post in forum.

Thanks and regards

Devika