PCB Impedance and Capacitance Calculator: Microstrip

W [m] width of the trace
H [m] height of dielectric above return plane
T [m] trace thickness
E_r [ ] relative permittivity of the dielectric

Are there distributed capacitive loads on this trace?
NoYes
L_a [m] average length of the traces attaching the loads
C_a [pF] average load capacitance

OUTPUT
Z₀ [Ohm] characteristic impedance
C₀ [F/m] capacitance per unit length
t_pd [s/m] propagation delay
L₀ [H/m] inductance per unit length
Z_c [Ohm] effective characteristic impedance
t'_pd [s/m] effective propagation delay

NOTE: numbers are in scientific notation (e.g.: 1.427e-9 s/m = 1.1427·10^-9 s/m = 1.427 ns/m)

CONDITIONS: ( 0.1 < W/H < 3.0);
Formulas:

Capacitive Load Modify:

See also notes on PCB Impedance and Capacitance Calculator page.

W		[m]	width of the trace
H		[m]	height of dielectric above return plane
T		[m]	trace thickness
E_r		[ ]	relative permittivity of the dielectric
	Are there distributed capacitive loads on this trace? NoYes
L_a		[m]	average length of the traces attaching the loads
C_a		[pF]	average load capacitance
	OUTPUT
Z₀		[Ohm]	characteristic impedance
C₀		[F/m]	capacitance per unit length
t_pd		[s/m]	propagation delay
L₀		[H/m]	inductance per unit length
Z_c		[Ohm]	effective characteristic impedance
t'_pd		[s/m]	effective propagation delay

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