Colorado Electronic Product Design - Analog / Digital Design, Telecommunications, DSP, Embedded Systems

Microstrip Impedance Calculator

Calculates the impedance of a microstrip. This calculator takes trace thickness into account and is not limited to a range of w / h ratios. Units do not matter as long as they are consistent - use the same units for w, h, and t. See Wheeler for equation.

w
h
t
ε
Z Ω
Materialε
Teflon2
Polyimide3
FR44.5
Rogers 40033.38
PTFE2.6
GETEK3.8 - 4.2
Nelco 4000-80003.5 - 4.4
Copper Thickness
t (mils)
Copper Thickness(Ounce)
2.82 oz.
1.41 oz.
0.71/2 oz.
0.351/4 oz.


Differential Impedance Calculator

Calculates the differential impedance of a microstrip pair. Zo is the impedance of an individual trace. Units do not matter as long as they are consistent.

Zdiff = 2 * Zo ( 1 0.48 e-0.96s/h )
s
h
Zo Ω
Zd Ω

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