Combining several deembeding methods to make a more acurate result for s-parameters

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yefj
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Hello , I have built a script by the method described in the article.
it has dut with two fixtures on both side.

I have fixture-X_length-fixture and fixture-2X_length-fixture
what is the best strategy to extract the sparams of the dut.
the optical article is good and it uses only one s2p instead of two.
What is the best way to do deembeding?
Thanks.
 
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Never let best be the enemy of good enough. You have closed-form expressions for both methods. You could do an error analysis using the closed-form expressions. Several ways come to mind. One is to do a Monte Carlo simulation and add random errors to the model parameters. Another is to take analytic derivatives of the models and perform a standard error analysis. The algebra will get messy, so using a CAS program like Mathematica is recommended.