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ngspice is free and can read and write S2P models. You can also just open the file with a text editor and read the S-parameters manually. With the appropriate skill and care, you can then manually calculate the desired matching with no electronics software at all.


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S11 is one of the S-parameters. It uses 1 port on the VNA to look into something and look at the reflection coming back to determine reflection coefficient / VSWR. If the device was calibrated properly then it can also tell you the complex impedance of what it is "seeing". To calibrate you have to use open, short, and load (99% this is 50 ohm), but ...


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