- The formulas used here are taken from the
*Design Guide for Electronic Packaging Utilizing High-Speed Techniques*(4th Working Draft, IPC-2251, February 2001).

- Range of valid parameters specified in
*the Design Guide*: w/(h-t) < 0.35; t/h <0.25; 1 < ε_{r}< 15 - Accuracy: For typical PCB parameters (ε
_{r}= 4, h = 15 mil and t = 1.37 mil), the deviation of the calculated results from results obtained using a 2D numerical field solver, is listed below:Z

_{0}w/(h-t) < 0.05more than 30%0.05 < w/(h-t) < 0.08within 2%0.08 < w/h < 0.32within 1%0.32 < w/(h-t) < 0.35within 2%C

_{0}w/(h-t)) < 0.05more than 100%0.05 < w/(h-t)) < 0.08within 2%0.08 < w/h < 0.32within 1%0.32 < w/(h-t) < 0.35within 2%

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