Question

Difference between the direct path and the diffracted path is called _______

(a) Average length

(b) Radio path length

(c) Excess path length

(d) Wavelength

This question was addressed to me during an interview.

My enquiry is from Diffraction in section Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

Answer 1

Right option is (c) Excess path length

Best explanation: Excess path length denoted by ∆, is the difference between the direct path and the diffracted path. It is calculated with the help of Fresnel zone geometry.