Ansys Learning Forum › Forums › Discuss Simulation › Electronics › How to calculate S parameter for Circular polarized source in Floquet port › Reply To: How to calculate S parameter for Circular polarized source in Floquet port

Hi! Note that Edit sources (where one can turn the modes On/Off and assign phases) affects only fields, not S-parameters. In HFSS, the basic modes of Floquet ports are linear based. There is a matrix that can translate 2 linear modes into 2 CP modes (LH and RH). I hope it's possible to google. Using this matrix, it's possible to tranform scattering S-matrix for linear modes into the scattering S-matrix for CP modes. It should be similar to transformation of single ended S-parameters to Diff/Comm modes S-parameters. Diff pair transition is easier to find. Just follow the steps with the correct description of the modes. It's easier to do for just one Floquet port, something like:Â

A_rcp= sqrt(1/2)*[ A_TE+ j*A_TM]; Â A_lcp= sqrt(1/2)*[ A_TE- j*A_TM]

Good luck with the math; there is no such an option in standard HFSS features. However, Far Field reporting has an option to report linear and CP polarizations, maybe it will be enough for your simulation goals.

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