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The region of the field that angular field distribution is independent of the distance from the antenna is called as _______

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The region of the field that angular field distribution is independent of the distance from the antenna is called as _______

(a) Reactive near-field

(b) Radiating near-field

(c) Fresnel zone

(d) Far field

The question was asked in a job interview.

The question is from Radiation Pattern topic in portion Antenna Parameters of Antennas

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The correct option is (d) Far field

The explanation is: The region of the field that angular distribution is independent of the distance from the antenna is called far field. This region is present at d distance greater than 2D^2/λ. Ideally the outer boundary is taken at infinity.

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