Microstrip Impedance Calculator - Electrical Engineering

Use this electrical engineering calculator to calculate the Characteristic Impedance, Capacitance per unit length, Inductance per unit length and DC resistance per unit length and propogation speed given the trace width, thickness, dielectric thickness and relative dielectric constant.

Note:
1. Increase in trace width (W) decreases Single Ended Impedance (Zo).
2. Increase in dielectric thickness (H) increases Zo.
3. Increase in trace thickness (t) decreases Zo.

Code to add this calci to your website

Just copy and paste the below code to your webpage where you want to display this calculator.

Formula:

Microstrip Impedance Zo = ( 87 / (√(e_r+1.41)) ) * In( (5.98*h)/( (0.8*w)+t ) ) T_pd = 3.333 * (√((0.475*er)+0.67)) * dimension; C = T_pd / Zo; L = T_pd * Zo / 1000; Dc = (17.2 / (w * t * dimension²)) / 1000;

Where, Zo = Single Ended Impedance e_r = Relative dielectric constant h = Trace width w = Trace height t = Trace thickness T_pd = Propagation Delay C = Capacitance L = Inductance Dc = Resistance if dimension unit is mm then dimension=1 if dimension unit is mils then dimension is 0.0254