Near Field Distance Calculator

How to Use This Calculator

1. Enter the frequency of the electromagnetic wave in Hertz (Hz). This can be radio waves, microwaves, infrared, etc.
2. Enter the wavelength of the wave in meters. If you only know the frequency, you can calculate the wavelength using the formula λ = c/f, where c is the speed of light (3×10⁸ m/s).
3. Click the "Calculate" button to compute the near field distance.
4. The result will be displayed in meters. The near field is typically considered to be within 1/2 wavelength of the source.

Understanding Near Field Distance

The near field is the region close to an antenna or other electromagnetic source where the electric and magnetic fields are out of phase and store energy. It's characterized by reactive fields rather than the propagating fields in the far field.

The formula used in this calculator is D = λ / (2π), which gives the distance from the source to the point where the electric field component is strongest (typically at 1/2 wavelength from the source).

Applications

This calculator is useful for:

• Antenna design and placement
• RFID systems
• Wireless charging technology
• Understanding electromagnetic field behavior around electronic devices