Q-quality factor? - FAQS.TIPS

08 April 2016 1 9K Report

Who can answer a question?

I have a banpass filter which presents on the S11 curve(one resonance frequency f1) and on the S21 curve (there are two resonances frequencies f2 and f3)

what are the frequencies that i shuold use to calculate the Q_quality factor of bandpass filter those of S11(reflexion) or those of S21(transmission)?

Ahmad Usman

You can use both S21 and S11 to get an idea of the quality factor. The following file in the website may help you better.

Usually S21 is used to measure loaded Q-factor

http://www.engr.sjsu.edu/rkwok/EE172/Q_factor.pdf

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