Far Field Calculator

Introduction

The Far Field Calculator is designed to calculate the far-field distance from an antenna based on its wavelength and aperture size. The far-field region is the region where the electromagnetic field radiated by an antenna can be considered as a plane wave, and the field patterns are not distorted by the antenna's geometry.

How to Use

1. Enter the wavelength (λ) of the antenna in meters.
2. Enter the aperture size (A) of the antenna in meters.
3. Click the "Calculate" button to compute the far-field distance.
4. The result will be displayed in meters.

Formula Explanation

The far-field distance (D) is calculated using the formula:

D = 2 * λ² / A

Where:

• D = Far Field Distance (meters)
• λ = Wavelength (meters)
• A = Aperture Size (meters)

Working Principle

The far-field distance is the distance at which the wavefronts of the electromagnetic wave radiated by the antenna are nearly planar. At this distance, the angular field distribution is independent of the distance from the antenna, and the field strength decreases with the square of the distance.