Microstrip Impedance Calculator

Microstrip impedance calculator

The microstrip impedance represents the characteristic impedance of the microstrip line, which is the uniform impedance provided by the uniform cross-sectional dimensions along the microstrip (flat copper conductor) length; to prevent signal reflection.

This online microstrip impedance calculator calculates the characteristic impedance of the microstrip (Ω), W/H ratio, and effective dielectric constant (εe) by entering the value of dielectric material relative permittivity (εr), the width of the copper trace (W), and dielectric height (H).      

What is Microstrip Impedance?

Microstrip is a type of transmission line to carry microwave-frequency signals, and it can be made up of a flat copper conductor suspended over a ground plane with a dielectric between them. The microstrip impedance represents the characteristic impedance of the microstrip line. The characteristic impedance of the microstrip line means that is the uniform impedance provided by the uniform cross-sectional dimensions along the microstrip (flat copper conductor) length; to prevent signal reflection.

How is Microstrip Impedance calculated?

The microstripp impedance is calculated by using the following formula: 

Where,

W = Width of the copper trace (flat copper conductor)

H= Distance between signal trace and ground plane/Dielectric substrate height 

ε_{r =} Relative permittivity/dielectric constant of the dielectric material.

ε_e = Effective dielectric constant

Z_o = Characteristic impedance of the microstrip in ohms (Ω).