March 22, 2023 at 9:58 pm
Guilin Sun
Ansys Employee

Port in FDTD can give you S parameters.

https://optics.ansys.com/hc/en-us/articles/360034382554-Ports-FDTD-Simulation-Object

https://optics.ansys.com/hc/en-us/articles/360042800213-Ring-resonator-getting-started-Final-parameter-extraction