These occur at regular intervals, separated by a quantity we'll call "deltaF". Whenever you measure the S-parameters of a coax cable, there are noticeable dips in S11 (and perhaps less noticeable dips in S21) periodic with frequency in the response. Here's a related page that shows a technique for calculating dielectric constant from group delay. But you can apply the math "backwards" and use this as a poor man's method of measuring effective dielectric constant for microstrip and stripline as well as coax structures. New for January 2008! This page is the result of a question that someone asked us about calculating the physical length of a coax cable from its swept frequency response. Click here to go to our main page on cablesĬlick here to go to our page on quarterwave tricksĬlick here to go to our page on transmission lines
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