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What is a near field?

What is a near field? Here are some definitions.

Noun
  1. (acoustics) The region within a distance a fraction of a wavelength from a sound source. Accordingly, the outer boundary of the near-field region is closer for high-pitched sound than for low-pitched sound.
  2. (electronics, communication) The region within about half a wavelength from an electrically small antenna. More specifically it is the region within the radiansphere.
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