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NEAR FIELD The term near-field region (also known as the '''near field''' or '''near zone''') has the following meanings with respect to different Telecommunications technologies:
The Diffraction pattern in the near field typically differs significantly from that observed at infinity and varies with distance from the source. FAR FIELD The far-field region is the region outside the near-field region, where the angular Field distribution is essentially independent of distance from the source. If the source has a maximum overall dimension ''D'' that is large compared to the wavelength, the far-field region is commonly taken to exist at distances greater than 2''D''&2/λ from the source, λ being the wavelength. For a Beam focused at infinity, the far-field region is sometimes referred to as the Fraunhofer region. Other synonyms are '''far field''', '''far zone''', and '''radiation field'''. SEE ALSO ;Local effects
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