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The portion of the near field immediate to the surrounding the antenna is called as _____

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The portion of the near field immediate to the surrounding the antenna is called as _____

(a) Reactive near-field

(b) Radiating near-field

(c) Fraunhofer zone

(d) Far field

This question was addressed to me during an internship interview.

My question comes from Radiation Pattern topic in portion Antenna Parameters of Antennas

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Correct option is (a) Reactive near-field

Easiest explanation: The portion of the near field immediate to the surrounding the antenna is called Reactive near-field. The boundary of this region exists at a distance of R < 0.62√(D^3/λ) where D is the largest dimension of the antenna. Radiating near field lies between reactive near field and far field. Far field is also known as Fraunhofer region.

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