# RF Wireless World

## Home of RF and Wireless Vendors and Resources

One Stop For Your RF and Wireless Need

## antenna near field distance calculator

This page of converters and calculators section covers antenna near field distance calculator. The calculator calculates antenna near field distance based on antenna dimension and wavelength of the signal.

Largest Antenna dimension in meter(input1) :

Operating Frequency in GHz (input2) :

Antenna Reactive Near Field Radial Distance (Output#1) :

EXAMPLE:
INPUTS : Antenna largest dimension (d) = 2.4 meter , Frequency = 6 GHz
OUTPUTS:
Reactive Near Field radial distance = 10.3 meter ,

### Antenna near field distance equation

As we know that space around an antenna is subdivided into four regions viz. reactive near field ( up to λ), reactive radiating near field ( up to 3*λ) , radiating (fresnel) near field (up to 2*D2 /λ) and radiating far field ( >=2*D2 /λ). Following equation or formula is used for antenna near field distance calculator. Reactive Near Field radial distance is calculated using 0.62(D3/λ)1/2 equation.

As in the far field, field pattern is independent of the distance. Hence near field distance measurement is very useful to determine from where far field region starts to perform electromagnetic field exposure level for various tests. ### Useful converters and calculators

Following is the list of useful converters and calculators.

dBm to Watt converter
Stripline Impedance calculator
Microstrip line impedance
Antenna G/T
Noise temp. to NF