Embedded Zo

Embedded Zo Calculator

microstrip embedded Zo impedance diagram


Trace Thickness
Substrate Height
Trace Height Above Plane
Trace Width
Substrate Dielectric

Output ⊕

Impedance (Zo): 
78.0 Ω
Capacitance (C): 
0.744 pF/cm
Propagation delay (Tpd): 
58.0 ps/cm
Inductance (L): 
4.53 nH/cm

View Notes

Calculation Notes

A microstrip is a type of electrical transmission line consisting of a conducting strip separated from a ground plane by a dielectric layer called the substrate. The embedded microstrip also has a dielectric above it, such as a soldermask.

Factors that influence the impedance calculation include:-

  • Trace thickness (t)
  • Substrate height (h)
  • Trace height above plane (hp)
  • Trace width (w)
  • Substrate dielectric (εr)

Z_{o}\approx \frac{60}{\sqrt{\varepsilon_{rp}}}\times\ln\left(\frac{5.98h_{p}}{(0.8w+t)}\right)

\varepsilon_{rp}\approx \varepsilon_{r}\bigg[1-exp\Big(-1.55\frac{h}{h_{p}}\Big)\bigg]

  • RF Design Guide Systems, Circuits and Equations (ISBN 0-89006-754-6)
  • High-Speed Digital Design (ISBN 0-13-395724-1)
  • Signal Integrity Issues and Printed Circuit Board Design (ISBN 0-13-335947-6)
  • IPC-2141 Controlled Impedance Circuit Boards and High Speed Logic Design

Disclaimer: The information and this tool are provided with no liability of any kind whatsoever, use at your own risk.

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