Microstrip Line Impedance Calculator

microstrip line
impedance
rf microwave
transmission line
permittivity

This page provides information and calculators related to microstrip line impedance.

Inputs

Outputs

EXAMPLE:

  • Relative permittivity = 10.9
  • h = 0.635 mm
  • W = 0.5mm

Result: Impedance = 52.31 Ohm, Effective permittivity = 7.18 (1 mm = 39.37 mils)

Microstrip Line Impedance Equation

A microstrip line is an inhomogeneous transmission line structure. It’s fundamentally composed of three layers:

  • Top Layer: A strip conductor etched according to the circuit layout.
  • Middle Layer: A dielectric material.
  • Bottom Layer: A completely metallized ground plane.

This microstrip line configuration is widely used due to its ease of fabrication using photolithographic processes. After etching, active and passive components can be easily soldered, providing straightforward access to the top layer. This also makes troubleshooting RF modules designed with microstrip lines much simpler.

The following equations are used to calculate the effective permittivity and impedance of a microstrip line:

Microstrip line effective permittivity equation:

Microstrip line effective permittivity

Microstrip line impedance equation:

Microstrip line impedance

Stripline Impedance Calculator

Stripline Impedance Calculator

Calculate the impedance of a stripline using this online calculator. Simply input the trace width, substrate height, and relative permittivity.

stripline
impedance
calculator
Microstrip Line Types: Overview and Applications

Microstrip Line Types: Overview and Applications

Explore the different types of microstrip lines—basic, stripline, suspended stripline, slotline, CPW, and finline—their features, advantages, and applications in RF and microwave circuits.

microstrip line
rf microwave
transmission line
Microstrip Width Calculator and Formula

Microstrip Width Calculator and Formula

Calculate the width of a microstrip line for a given impedance and substrate parameters using this calculator and explore the underlying formula.

microstrip
width
calculator