Calculate the required trace width for a given characteristic impedance (Z₀) on a substrate.
Calculated Width
Width W:0.00 mm
Effective permittivity εeff:0.00
Equations (valid for W/h ≥ 1):
First compute A = Z₀/60 √((εr+1)/2) + (εr-1)/(εr+1)(0.23 + 0.11/εr)
Then W/h = 8eA/(e2A - 2) for W/h < 2; otherwise use a different formula. This implementation uses the common approximation for W/h ≥ 1.