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This calculator calculates Z from shunt S21 and related calibration measurements.
The calculator does not do a lot of error checking, if you enter nonsense, it will probably produce nonsense.
Inputs are assumed wrt 50+j0 (Ω).
A shunt impedance Zc is used to find the equivalent source admittances of Port 1 plus Port 2 (Ys+Yl) for improved accuracy. Zc is measured using a s11 reflection measurement.
s21c is an s21 measurement with Zc in shunt from Port 1 to Port 2.
s21u is an s21 measurement with Zu (the unknown) in shunt from Port 1 to Port 2.
Version | Date | Description |
1.01 | 16/02/2021 | Initial. |
1.02 | 28/05/24 | Revised to use Ys+Yl. |
1.03 | ||
1.04 | ||
1.05 |
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