TIA's Glossary of Telecommunication Terms
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far-field region
The region where the angular field distribution is essentially independent of distance from the source. (188) Note 1: 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 2D 2/
from the source, being the wavelength. Note 2: For a beam focused at infinity, the far-field region is sometimes referred to as the Fraunhofer region. Synonyms far field, far zone, Fraunhofer region, radiation field.