Fraunhofer distance

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For other articles bearing the name of the physicist, see Fraunhofer.

The Fraunhofer distance, named after Joseph von Fraunhofer, is the value of:

d = {{2D^2}\over{\lambda}},

where D is the largest dimension of the radiator (or the diameter of the antenna) and {\lambda} is the wavelength of the radio wave. This distance provides the limit between the near and far field.

See also[edit]