This calculator allows calculation of Calculate impedance from S11, S21 using S11 reflection, S21 series & S21 shunt (all s parameters wrt 50Ω). Note:
The results are valid only for linear circuits.
The calculator does not do a lot of error checking, if you enter nonsense, it will probably produce nonsense.
It is worth noting that accurate S21 measurements depend on 12 term correction of the VNA, a point overlooked by many proponents of the series and shunt measurement techniques.
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