Stripline Impedance Calculator

Welcome to this tutorial on the Stripline Impedance Calculator! In the field of electrical engineering, stripline circuits play a crucial role in high-frequency signal transmission and impedance matching. Understanding the impedance of a stripline is essential for designing and analyzing such circuits. This tutorial will introduce you to the concept of stripline impedance, discuss interesting facts about striplines, explain the formula involved, provide a real-life example, and guide you through the calculation process step by step.

PCB Impedance Calculator
Relative Permittivity of the Dielectric
Height of Trace
Trace Thickness
Width of the Trace
Stripline Impedance Calculator Results
Characteristic Impedance = Ohm
Capacitance Per Unit Length = F/m
Effective Propagation Delay = s/m
Inductance Per Unit Length = H/m

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Learn how to calculate the impedance of a stripline using the Stripline Impedance Calculator. Understand the formula, its application, and real-life examples.

Interesting Facts

Before we delve into the calculations, let's explore some interesting facts about striplines:

  • A stripline is a type of transmission line consisting of a conductor sandwiched between two dielectric layers.
  • It is commonly used in high-frequency electronic circuits to route signals with controlled impedance and minimize signal loss.
  • Striplines offer better shielding and noise immunity compared to other transmission line configurations.
  • They are widely used in applications such as microwave communication systems, radar systems, high-speed digital circuits, and RF filters.

Formula Explanation

The impedance of a stripline can be calculated using the following formula:

Z = Z0 × √(Er+1) × ln(H/W + √((H/W)2 - 1))


  • Z is the characteristic impedance of the stripline (in ohms).
  • Z0 is the characteristic impedance of free space (approximately 377 ohms).
  • Er is the relative permittivity (dielectric constant) of the substrate material.
  • H is the height of the dielectric layer (in meters).
  • W is the width of the conductor (in meters).

This formula allows us to determine the characteristic impedance of a stripline based on the geometric and dielectric parameters.

Real-Life Application

The calculation of stripline impedance has practical applications in various areas of electrical engineering. Let's consider an example in the field of RF communication.

Suppose we are designing a stripline circuit for a wireless communication system operating at a frequency of 2.4 GHz. The substrate material has a relative permittivity (Er) of 4.5. The dielectric layer height (H) is 0.5 mm, and the conductor width (W) is 1.2 mm. We want to calculate the characteristic impedance (Z) of the stripline.

Using the formula mentioned earlier, we can calculate the stripline impedance as follows:

Z = Z0 × √(Er+1) × ln(H/W + √((H/W)2 - 1))

Substituting the given values:

Z = 377 × √(4.5+1) × ln(0.5 mm/1.2 mm + √((0.5 mm/1.2 mm)2 - 1))

Calculating the value:

Z ≈ 377 × √5.5 × ln(0.4167 + √(0.41672 - 1))

Z ≈ 377 × √5.5 × ln(0.4167 + √(-0.2764))

Since the value inside the square root is negative, it indicates that the stripline does not support a valid solution within the given parameters. In such cases, alternative designs or modifications to the dimensions may be required to achieve a practical and feasible solution.

In real-life applications, the calculation of stripline impedance is crucial for designing and optimizing high-frequency circuits. By determining the characteristic impedance, engineers can match the impedance of the stripline with other components in the circuit, ensuring efficient signal transfer, minimizing reflections, and maximizing power transfer.

For example, in the field of RF communication, striplines are commonly used in the design of antennas, filters, and transmission lines. By calculating the stripline impedance, engineers can ensure the proper functioning and performance of these components, enabling effective wireless communication.

To summarize, the Stripline Impedance Calculator enables engineers to calculate the characteristic impedance of a stripline based on its geometric dimensions and dielectric properties. This information is crucial for designing high-frequency circuits and achieving impedance matching. By understanding the formula and concepts explained in this tutorial, you can apply them to various RF and microwave engineering applications and make informed design decisions.

We hope you found this tutorial on the Stripline Impedance Calculator informative and helpful. Remember to consider the relative permittivity, dielectric layer height, and conductor width when calculating the stripline impedance. Best of luck in your engineering endeavors!