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    Information about the loss tangent of FR4

    Hi, all. These days I've been reading Kin-Lu Wong's book,

    planar antennas for wireless applicaitons, I was confronted

    with a question. In this book, lots of printed antennas are

    printed on FR4, the relative permitivity and the hight of the

    substrates have been given, but the loss tangent of the

    substrate hasn't been given. Could anybody give me some

    information of the loss tangent of FR4?
    Thank you very much in advance.

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    tand fr4

    0.04. I saw it somewhere



    •   Alt21st October 2005, 15:22

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    fr4 permitivity

    FR4 loss tangent is 0,012 - 0,019



    •   Alt21st October 2005, 15:54

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    loss tangent of fr4

    Hello

    It is not 0.04 it is 0.014

    http://www.rogerscorporation.com/mwu/tip12.htm

    Black Jack is correct it varies from 0.012 - 0.019

    --manju--



    •   Alt22nd October 2005, 08:17

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    tand of fr4

    hi the FR4 tand at 3Ghz is 0.02 and Er is 4.3 at 3GHz (note that Er is 4.7 at low frequencies only) some thing else FR4 is note built for high frequencies.



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    fr4 er tand

    as told many times, FR4 don't identify totally the compound. many FR4's may be different between them.
    As rule of thumb i've measured a tand=0.02 +/- 0.003 at 0.5...2 GHz
    What is important, is not the exact value, but the fact that is ten times the tand of a Roger 's laminate.


    1 members found this post helpful.

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    fr-4 tand

    I confirm that in 0.5 - 2 GHz range the loss factor is about 0.02



    •   Alt23rd October 2005, 16:07

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  8. #8
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    fr4 loss tangent

    Thank you above very much.



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    fr4 tand typical

    For Alumina you cn use 2.10-4 as a common value.



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