FR4 specification for microwave design

young.microwave.eng · Jun 14, 2011

dear roommates
i'd like to know the parameters of FR4
εr:?
thickness:?
Tan delta:?

I'm in hurry.
thanks in advance

volker_muehlhaus · Jun 14, 2011

young.microwave.eng said:
εr:?

4.2 .... 4.7

young.microwave.eng said:
Tan delta:?

~ 0.03

young.microwave.eng said:
thickness:?

Why do you think we know what substrate thickness you are using?

tony_lth · Jun 14, 2011

thickness:?

there are 0.1mm, 0.32mm, 0.5mm, ..., 1mm, ...,1.6mm.Almost any thickness you need, the manufacture can make.

young.microwave.eng · Jun 15, 2011

volker_muehlhaus said:
4.2 .... 4.7

~ 0.03

Why do you think we know what substrate thickness you are using?

thanks for your helpful replies
I meant that what's the standard thickness of FR4.seems that volker mentioned some thicknesses.thanks alot

govardhanamma · Jun 15, 2011

FR-4 Dielectric Constant = 4.5 & Loss Tangent = 0.021
Standard FR4 thickness are 0.8, 1.0, 1.2, 1.5 and 1.6 mm.