PCB Impedance and Capacitance of Microstrip

calculate the pcb impedabce and capacitance of microstrip

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Microstrip
W[m] width of the trace
H[m] height of dielectric above return plane
T[m] trace thickness
Er[ ] relative permittivity of the dielectric
 
Are there distributed capacitive loads on this trace?
NoYes
La[m] average length of the traces attaching the loads
Ca[pF] average load capacitance
 
OUTPUT
  
Z0[Ohm] characteristic impedance
C0[F/m] capacitance per unit length
tpd[s/m] propagation delay
L0[H/m] inductance per unit length
Zc[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:

Formula



Capacitive Load Modify:

Formulas for: Capacitive Load Modify
See also notes on PCB Impedance and Capacitance Calculator page.

 

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