Microstrip Impedance Calculator
Calculate impedance for outer layer traces
Trace Parameters
Signal Trace (W × T)
H
Dielectric (Er = 4.5)
Ground Plane
For wavelength calculation
Results
Characteristic Impedance (Z0)
43.39Ω
Effective Er
3.462
Propagation Delay
157.65 ps/in
Wavelength
161.12 mm
Capacitance
3.634 pF/in
Inductance
6.840 nH/in
Velocity
161.1 km/s
Common Impedances
Single-ended digital50Ω
RF/Microwave50Ω
Video signals75Ω
Design Guidelines
- Maintain continuous ground plane beneath trace
- Avoid routing over splits in reference plane
- Keep trace length less than λ/10 for lumped model