Fraunhofer Region

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Fraunhofer Region </dt>
That region of the field in which the energy flow from an antenna proceeds essentially as though coming from a point source located in the vicinity of the antenna. </dd>
''If the antenna has a well-defined aperture a in a given aspect, the Fraunhofer region in that aspect is commonly taken to exist at distances greater than 2a² /Missing Image:img src="SP7-f_files/lambdasm.html" from the aperture, Missing Image:img src="SP7-f_files/lambdasm.html" being the wavelength. [[/a>|/a> ]]</dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use