formula.expert

Constants library

1 value, each with its units, its uncertainty, and where it came from.

Electromagnetic 1

Relative permittivity of FR-4 measured

εr,FR-4=4.4 —\varepsilon_{r,\mathrm{FR\text{-}4}} = 4.4\ \text{—}

—Typical dielectric constant of FR-4 circuit-board laminate near 1 GHz — the number behind every microstrip impedance and trace-delay calculation.