i would like to clarify some points of the new feature ‘Ports’ of FDTD. I want to calculate S-parameters in a broad frequency range. In the ‘Modal Properties’ tab i select 10 frequency points an in the frequency analysis tab i run a Frequency sweep (is it necessary?) which results in artificial peaks like here https://kb.lumerical.com/en/pic_passive_dispersion_analysis.html. However, in Material Explorer there isn’t the ‘fit with multi-coefficient model’ button to solve the above problem. Is there another way to do this?
The peaks are also observed in S-parameters (abs^2) when i select 10 frequency points whereas the s-parameter curve is smooth when i choose 1 frequency point.
Thanks in advance