Define reactive near field region of antenna.

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4. Define reactive near field region of antenna.

Reactive near-field region is defined as “that portion of the near-field region immediately surrounding the antenna wherein the reactive field predominates.” For most antennas, the outer boundary of this region is commonly taken to exist at a distance  R<0.62 √(D 3⁄λ) from the antenna surface, where λ is the wavelength and D is the largest dimension of the antenna

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