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How to find Inductance/length given an s-parameter of a transmission line?

venn_ng

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Is there a way to find the inductance/length given an s-parameter of a transmission line. Assume that I have no idea of the characteristic impedance Zo either. Is there a possible way to find it using simple ac sims (say using input imepdance)? The TL line has a non-zero R,L and C. I know the length of transmission line too. Let's call that 'l'
 

FvM

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The question is somehow incomplete. What is "an s-parameter"? S11? A single frequency S11 value can be directly converted into a RL or RC parallel or series equivalent circuit. But I guess that's not your question.

What R, L, and C of the transmission line are you asking about? A lossy TL model has 4 rather than 3 elements (series L and R, shunt C and G). At least R and G are frequency dependent.

Z0 and electrical length can be extracted from multiple frequency S11 points.
 

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