Popular Substrate Materials
Substrate Material
Relative Permittivity
Loss Tangent
99.5% Pure
9.8 0.0001
FR4 Fiberglass 4.5-4.9 0.01
GaAs 12.9 0.002
PTFE 2.1 0.0003
Quartz 3.78 0.0001

Please note that this table is provided for reference only. You should contact your substrate vendor for detailed electrical characteristics. Your vendor should be able to also provide tolerances on the dielectric constant, loss tangent, and thickness.

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