Provide values for four of the five parameters h, c, t, w, Z_{0} and the relative permittivity
of the dielectric. Click the button corresponding to the unknown parameter to calculate its value
( w/(h-t) <0.35; t/h <0.25; 1 < ε_{r} <15 ).

**Notes:**

- 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, c = 10 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) < 0.04more than 30%0.04 < w/(h-t) < 0.08within 5%0.08 < w/h < 0.35within 1%C

_{0}w/(h-t) < 0.04more than 80%0.04 < w/(h-t) < 0.08within 5%0.08 < w/h < 0.27within 10%0.27 < w/h < 0.35within 12%

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