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In mobile communication system, diffraction loss occurs due to ______

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In mobile communication system, diffraction loss occurs due to ______

(a) Dielectric medium

(b) Obstruction

(c) Electric field

(d) Operating frequency

The question was asked during an online exam.

I'd like to ask this question from Diffraction topic in portion Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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The correct option is (b) Obstruction

Easy explanation: Diffraction loss occurs from the blockage of secondary waves such that only a portion of the energy is diffracted around an obstacle. An obstruction causes a blockage of energy from source some of the Fresnel zones, allowing only some of the transmitted energy to reach the receiver.

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