Information about the loss tangent of FR4
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.
0.04. I saw it somewhere
FR4 loss tangent is 0,012 - 0,019
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--
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.
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.
I confirm that in 0.5 - 2 GHz range the loss factor is about 0.02
Thank you above very much.
For Alumina you cn use 2.10-4 as a common value.