Английская Википедия:Fraunhofer distance
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Шаблон:For The Fraunhofer distance, named after Joseph von Fraunhofer, is the value of:
- <math>d = {{2D^2}\over{\lambda}},</math>
where D is the largest dimension of the radiator (in the case of a magnetic loop antenna, the diameter) and <math>{\lambda}</math> is the wavelength of the radio wave. This distance provides the limit between the near and far field.
See also
