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About transmission line

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annbyr

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How to make use of transmission lines to measure the substrate dielectric constant and loss tangent?
Is there any material about this....
 

annbyr

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I can not open the link, could you please upload the pdf file? thant you!

vfone said:
h**p://www.emclab.umr.edu/pdf/TR00-1-041.pdf#search=%22dielectric%20constant%20measurement%22
 

flyhigh

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Hi,

usually you make ring or T resonator and calculate the electrical length and attenuation factor based on resonaces (frequences and Q factor). It is very good and realible method used by manufacturers of substrate material. It alows the frequency dependency of Er and TanD to be accurately determined. You can find details in the book by Edwards: Foundations for Microstrip Circuit Design.

flyhigh
 

radiohead

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The link works fine, just copy the url and change the ** with two t's.
 

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