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Calculate Z from shunt S21 - enhanced

This calculator calculates Z from shunt S21 and related calibration measurements.

Inputs:  
 
    Real /magnitude Imaginary / angle
Zc
S21c   
S21u
       
Results:  
Zc (Ω)  
Ys+Yl (S)  
Zu (Ω)  
Yu (Ω)  

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.

Links / references

Changes

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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