Differential Microstrip Impedance Calculator

This page describes a Differential Microstrip Impedance Calculator and the formulas or equations used within it.

Figure 1: Differential Microstrip Line

The figure above (Figure 1) illustrates a differential microstrip line configuration.

For more comprehensive information, refer to articles on the types of microstrip lines and the fundamentals of microstrip lines.

Example Calculation

INPUTS:

• Er (Dielectric Constant) = 4.5
• w (Trace Width) = 5.2 mm
• d (Spacing Between Traces) = 5.2 mm
• t (Trace Thickness) = 1.5 mm
• h (Substrate Height) = 4.6 mm

OUTPUT:

• Characteristic Impedance = 56.58 Ohms
• Differential Impedance = 94.81 Ohms

(1 mm = 39.37 mils)

mm to mils converter

INPUT:

• mm = 0.5

OUTPUT:

• mils = 19.685

Differential Microstrip Impedance Formula or Equation

The following equation or formula is used for the Differential Microstrip Impedance Calculator: