I just got the hint that there was a bug in the picture above (wrong connection of SnP component). Therefore, I removed it.
Here is the correct schematic for complex port impedances in s-parameter simulations. Note that port 2 of the file component X1 must be connected to the s-parameter source P1.
By the way, this concept gives correct results for noise figure NF and NFmin, but not for optimum source impedance Sopt.
