Stripline Impedance Calculator
Calculate the characteristic impedance, propagation velocity, delay and wavelength of a symmetric stripline using standard stripline equations.
5
Inputs
Live
Math
3
Related
Enter parameters and click Calculate to view results
Formula & Theory
Z₀ = (30π / √εr) / (w/b + 0.441) for w/b ≤ 0.35This formula is used to calculate antenna parameters for stripline impedance calculator.
Overview
Stripline Impedance helps you calculate design values for a transmission lines project from Dielectric Height to Each Ground Plane, Trace Width, Copper Thickness, Relative Permittivity (εr), Frequency. Calculate the characteristic impedance, propagation velocity, delay and wavelength of a symmetric stripline using standard stripline equations. Use the result to make an informed first design decision before choosing hardware, setting dimensions, or evaluating the RF system in its final environment.
Input Guide
Enter Dielectric Height to Each Ground Plane, Trace Width, Copper Thickness, Relative Permittivity (εr), Frequency exactly in the units shown by this stripline impedance. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Dielectric Height to Each Ground Plane — use mm.
- Trace Width — use mm.
- Copper Thickness — use mm.
- Relative Permittivity (εr).
- Frequency — use MHz.
Output Guide
The results describe the calculated stripline impedance values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The Stripline Impedance uses Z₀ = (30π / √εr) / (w/b + 0.441) for w/b ≤ 0.35. Supply Dielectric Height to Each Ground Plane (mm), Trace Width (mm), Copper Thickness (mm), Relative Permittivity (εr), Frequency (MHz) in the displayed units, then use the calculated values as the first engineering target for this transmission lines design or analysis.
Design Notes
This transmission lines calculation is based on Z₀ = (30π / √εr) / (w/b + 0.441) for w/b ≤ 0.35. Real-world accuracy depends on factors such as material properties, losses, mounting, nearby conductors, ground interaction, feed-line effects, and construction tolerance. Confirm the final system with measurement or simulation.
Build and Tuning Notes
Apply the stripline impedance result as an initial target, then validate it in the intended installation. Keep the physical layout and feed arrangement consistent while testing, change one parameter at a time, and record the measured outcome before making another adjustment.
Frequently Asked Questions
What does the Stripline Impedance calculate?
Calculate the characteristic impedance, propagation velocity, delay and wavelength of a symmetric stripline using standard stripline equations. The calculation provides an initial design value based on Dielectric Height to Each Ground Plane (mm), Trace Width (mm), Copper Thickness (mm), Relative Permittivity (εr), Frequency (MHz).
Which inputs are needed for the Stripline Impedance?
Enter Dielectric Height to Each Ground Plane (mm), Trace Width (mm), Copper Thickness (mm), Relative Permittivity (εr), Frequency (MHz) using the displayed units. Each value directly affects the calculated result, so confirm the unit and operating conditions before running the calculation.
How accurate is this stripline impedance?
It follows Z₀ = (30π / √εr) / (w/b + 0.441) for w/b ≤ 0.35. It is accurate for the formula assumptions, but installed performance can change because of materials, loss, environment, mounting, nearby objects, and measurement uncertainty.
What should I do after using the Stripline Impedance?
Compare the result with the practical constraints of your transmission lines system, then validate the completed design with appropriate measurement equipment or simulation.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.