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Fraunhofer distance is given by _____

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Fraunhofer distance is given by _____

(a) 2D2/λ

(b) 2D/λ

(c) D/λ

(d) 2D/λ2

The question was posed to me in an internship interview.

Enquiry is from Free Space Propagation Model topic in section Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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The correct choice is (a) 2D2/λ

Easiest explanation: Fraunhofer distance, also known as far field distance is inversely proportional to wavelength. It depends on the largest physical dimension of the antennal (D). This distance basically denotes the boundary between far field and near field region.

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