Provide values for three of the four parameters h, t, w, Z_{0}
and the relative permittivity of the dielectric. Click the button corresponding
to the unknown parameter to calculate its value ( 0.1< w/h < 3.0; 1
< ε_{r} < 15).

- 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*: 0.1< w/h < 3.0; 1 < ε_{r}< 15 - Accuracy: For typical PCB parameters
(ε
_{r}= 4, h = 30 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}0.1 < w/h < 0.2within 5%0.2 < w/h < 1.5within 2%1.5 < w/h < 2.0within 5%2.0 < w/h < 2.7within 10%2.7 < w/h < 3.0within 15%C

_{0}0.1 < w/h < 0.2within 10%0.2 < w/h < 1.2within 5%1.2 < w/h < 2.0within 10%2.0 < w/h < 3.0within 5%

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