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Thanks for your apply. I tried to use group delay results to calculate GVD in HFSS.Are you obtaining the data from a dispersion simulation, or a driven simulation? The dispersion will directly give you Beta as a function of frequency, but if your structure isn't continuous or periodic this wouldn't be the most appropriate.
You can extract Beta from the scattering parameters of a driven simulation through assuming homogenization (i,e, convert the scattering parameters to something like ABCD parameters, and Beta will be imag{acos(A)/l}, where l is the length of your homogenized line).
You can take the derivative in either of these cases by using the "deriv" function in the output variables (HFSS->Results->Output Variables)
Thanks for your apply. I think you are right. I'm glad I learned something newI wasn't aware that HFSS had a built-in group delay function, shows what I know! Thanks for pointing that out.
Your statements looks fine, expect I think item (3) should read: to get GVD: divide GDD by length. This is because GDD measures the second derivative of phase, whereas phase is Beta x Length, and GVD measures the second derivative of Beta.