Fresnel Region

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Fresnel Region </dt>
The region between the antenna and the Fraunhofer region. </dd>
''If the antenna has a well-defined aperture a in a given aspect, the Fresnel region is that aspect is commonly taken to extend a distance 2a^a /Missing Image:img src="SP7-f_files/lambdasm.html" in that aspect, 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