Impedance Calculator for Stripline

The structure of a stripline is shown below. Impedance calculators attempt to calculate the Impedance and the capacitance per unit length as a function of width of trace W , height above ground plane H, permeability of dielectric and thickness of trace t.



The IPC formula for stripline is



The IPC formula for stripline is



Online calculators or spreadsheets can be used for calculating the impedance of a stripline.

The accuracy of these calculators is of the order 5%, which is generally good enough for most of the high speed PCBs that we work on. The calculators are based upon the formula.

Wadell formula for stripline is given below





Parameters for Wadell Formuls



The Characteristic Impedance of the Stripline using Wadell formula is given by




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