Fresnel Zone Calculator

Calculate Fresnel zone radius and clearance for wireless signal optimization with this easy-to-use online tool.

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About This Tool

This Fresnel Zone Calculator helps you determine the critical clearance needed for optimal wireless signal transmission between two antennas. By inputting frequency, distance, and obstruction height, you can compute the Fresnel zone radius, required clearance, and analyze potential signal obstructions. Essential for WiFi, microwave, and radio frequency planning to ensure reliable communication links.

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How to Use

Enter the frequency in MHz (e.g., 2400 for
4 GHz).
Enter the distance between antennas in kilometers.
Optionally, enter the obstruction height in meters for clearance analysis.
Click 'Calculate Fresnel Zone' to see results including radius, clearance, and obstruction status.

Frequently Asked Questions

Find Quick Answers

What is a Fresnel zone?

A Fresnel zone is an elliptical area around the line of sight between two antennas that must be kept clear of obstructions to prevent signal degradation in wireless communication.

Why is Fresnel zone clearance important?

Obstructions within the Fresnel zone can cause signal reflection, diffraction, or attenuation, leading to reduced signal strength and reliability. Keeping 60% of the first Fresnel zone clear is recommended for optimal performance.

What units should I use for inputs?

Use MHz for frequency (e.g., 5800 for 5.8 GHz), kilometers for distance, and meters for obstruction height. The calculator automatically handles unit conversions internally.

Can I use this for any frequency?

Yes, the calculator works for any radio frequency, including WiFi (2.4 GHz, 5 GHz), microwave links, and other RF applications. Ensure inputs are within realistic ranges (e.g., frequency > 0, distance > 0).

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