EMC Question of the Week: June 9, 2025

Trace embedded in a dielectric between two copper planes labeled stripline trace

A circuit board trace embedded in an FR-4 (εr = 4.3) dielectric between two planes forms a transmission line with a capacitance per unit length equal to 1.5 pF/cm. What is the characteristic impedance of that transmission line? 

  1. < 40 Ω
  2. 46 Ω
  3. 54 Ω
  4. > 60 Ω

Reveal Question of the Week - Answer 250609