Fraunhofer distance

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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

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