skrf.calibration.calibration.unterminate¶

skrf.calibration.calibration.
unterminate
(ntwk, gamma_f, gamma_r)[source]¶ Unterminates switch terms from a raw measurement.
In order to use the 8term error model on a VNA which employs a switched source, the effects of the switch must be accounted for. This is done through switch terms as described in [1] . The two switch terms are defined as,
\[\Gamma_f = \frac{a2}{b2} ,\qquad\text{sourced by port 1}\ \Gamma_r = \frac{a1}{b1} ,\qquad\text{sourced by port 2}\]These can be measured by foursampler VNA’s by setting up userdefined traces onboard the VNA. If the VNA doesnt have 4samplers, then you can measure switch terms indirectly by using a twotier twoport calibration. First do a SOLT, then convert the 12term error coefs to 8term, and pull out the switch terms.
Parameters:  two_port (2port Network) – the raw measurement
 gamma_f (1port Network) – the measured forward switch term. gamma_f = a2/b2 sourced by port1
 gamma_r (1port Network) – the measured reverse switch term gamma_r = a1/b1 sourced by port2
Returns: ntwk
Return type: Network object
References
[1] “Formulations of the Basic Vector Network Analyzer Error Model including Switch Terms” by Roger B. Marks