[SOLVED] FR4 dielectric constant/ permittivity vs. temperature

[elberlee]

Hi, all,

Can any some give me some details data of the correlation between FR4 dielectric constant (Dk) vs. temperature? Such as data sheet or a curve?

I had tried to google it, but i did not find any numbers. I need these different Dk numbers of different temperatures in simulation.

Thanks in advance!

Elber

 

[biff44]

FR4 means different things to different manufacturers! The best thing would be to build a structure on the same material you intend to use, and measure it drift over temperature.

 

[vfone]

From 0 to 100 Celsius there are just slightly variation of dielectric constant vs temperature:

http://www.ieee802.org/3/ap/public/may04/goergen_01_0504.pdf

http://ecadigitallibrary.com/pdf/55thECTC/55ECTC285_cpt.pdf

 

[mvs sarma]

And perhaps thickness of the copper clad used.

 

[elberlee]

Thanks Vfone,

these document is really helpful!

Elber