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How to calculate the Q factor from the s-parameters ?

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magneto_cool

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Q factor

Hi,

May i know how do i compute the Q-factor for a capacitor or inductor from the S-parameters measured.

Any help will be much appreciated

Thank You

Regards
 

sergio mariotti

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Q factor

sure!
1st you should know if spar are measured as 2 port or 1 port.
2nd put the spar file into a simulator, if 2 port, short to gnd the out port.
3rd plot Real and Immaginary part of input reactance vs Freq.
4th compute Q= |jX|/R

5th note that for spar measured near external Smith Circle, the accuracy of the calculated Q is poor or bad.
 

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