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Message: [QUOTE="Geronimo Stempovski, post: 1963579"] Again, I'm looking for a diagram like frequency (some MHz to 10 GHz for example) versus loss tangent and / or epsilon R for FR4 or other usual PCB material. I only found a poor black-and-white copy from 1991 in a paper which I searched with Google. I wouldn't have thought it to be so hard to find a graph but as noone replied to my previous question so far it does seem to be hard! :-) Does anybody know where I can find that? Regards Gero [/QUOTE]