Question

Which of the following explains the concept of diffraction loss?

(a) Principle of Simultaneity

(b) Pascal’s Principle

(c) Fresnel zone

(d) Archimedes’ Principle

I have been asked this question at a job interview.

This key question is from Diffraction topic in chapter Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

Answer 1

The correct choice is (c) Fresnel zone

Explanation: The concept of diffraction loss is a function of the path difference around an obstruction. It can be explained by Fresnel zones. Fresnel zones represent successive regions where secondary waves have a path length from Tx to Rx which are nλ/2 greater than total path length.