The characteristic impedance (Zo) of a microstrip transmission line can be calculated with the active calculator.

Relative Dielectric Constant εr : Width of track a or W : mm Thickness of track (1 oz/ft2 = 0.035 mm) t : Thickness of dielectric h : Space between traces b : mm or s or d : mm

---

		Formula by Wadell
Effective Dielectric Constant	Eeff :
Characteristic Impedance	Zo :		Ohms
Propagation Delay	Tp :		ns/mm
Propagation Speed	Vp :		mm/ns

hypothesis: with very wide ground strips