Antenna Near Field & Far Field Distance Calculator

The separation distance from an antenna can be divided into several regions. The transition between these regions is not distinct and the changes in antenna performance will be gradual. The regions depend on the maximum linear dimension of the antenna and the wavelength. This tool that will calculate the near-field and far-field distances based on the antenna dimension and wavelength.

For electrically small antennas (where D < λ / 2) there are only two regions; near-field and far-field. For electrically large antennas there are three regions; reactive near-field, radiating near-field and the far-field distance.


Near Field & Far Field Distance Calculator
Antenna Dimension, D

Wavelength, λ
Reactive Near-Field
Radiating Near-Field


Reactive near field formula
Radiating near field formula
Far field formula
Frequency Wavelength Formula

D Largest antenna dimension
λ represents wavelength in meters
C is the velocity factor 299,792,458 meters per second
Freq is the Frequency in cycles per second

Product Showcase

Double Ridge Guide Horn Antenna

Double Ridge Guide Horn Antenna
  • 18 GHz to 40 GHz
  • Precision machined, Rugged Construction
  • Broadband High Frequency

High gain, low VSWR, and rugged design make this dual ridge horn antenna excellent for both immunity and emissions testing.


Additional Resource

Antenna Beamwidth Coverage Calculations

Field Intensity Calculation

This tool will calculate the maximum coverage that the antenna will cover from a specified distance and antenna's half-power beamwidth. [more...]

Contact Details

A.H. Systems, inc.
9710 Cozycroft Ave.
Chatsworth, CA 91311

P: (818) 998-0223

F: (818) 998-6892

E: Email