Notes
 The formulas used here are taken from the Design Guide for Electronic Packaging
Utilizing HighSpeed Techniques (4th Working Draft, IPC2251, February 2001).
 Range of valid parameters specified in the Design Guide: W/(HT) <
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/(HT) < 0.05 
more than 30% 
0.05 < W/(HT) < 0.08 
within 2% 
0.08 < W/H < 0.32 
within 1% 
0.32 < W/(HT) < 0.35 
within 2% 
C_{0}: 

W/(HT) < 0.05 
more than 100% 
0.05 < W/(HT) < 0.08 
within 2% 
0.08 < W/H < 0.32 
within 1% 
0.32 < W/(HT) < 0.35 
within 2% 
