Spiral Antenna Calculator
Calculate the dimensions and bandwidth characteristics of an Archimedean spiral antenna.
3
Inputs
Live
Math
3
Related
Enter parameters and click Calculate to view results
Formula & Theory
Outer Diameter ≈ λmax/π, Inner Diameter ≈ λmin/πThis formula is used to calculate antenna parameters for spiral antenna calculator.
Overview
Spiral Antenna helps you calculate design values for a resonant antennas project from Lowest Frequency, Highest Frequency, Number of Turns. Calculate the dimensions and bandwidth characteristics of an Archimedean spiral antenna. 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 Lowest Frequency, Highest Frequency, Number of Turns exactly in the units shown by this spiral antenna. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Lowest Frequency — use GHz.
- Highest Frequency — use GHz.
- Number of Turns.
Output Guide
The results describe the calculated spiral antenna 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 Spiral Antenna uses Outer Diameter ≈ λmax/π, Inner Diameter ≈ λmin/π. Supply Lowest Frequency (GHz), Highest Frequency (GHz), Number of Turns in the displayed units, then use the calculated values as the first engineering target for this resonant antennas design or analysis.
Design Notes
This resonant antennas calculation is based on Outer Diameter ≈ λmax/π, Inner Diameter ≈ λmin/π. 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 spiral antenna 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 Spiral Antenna calculate?
Calculate the dimensions and bandwidth characteristics of an Archimedean spiral antenna. The calculation provides an initial design value based on Lowest Frequency (GHz), Highest Frequency (GHz), Number of Turns.
Which inputs are needed for the Spiral Antenna?
Enter Lowest Frequency (GHz), Highest Frequency (GHz), Number of Turns 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 spiral antenna?
It follows Outer Diameter ≈ λmax/π, Inner Diameter ≈ λmin/π. 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 Spiral Antenna?
Compare the result with the practical constraints of your resonant antennas 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.