Question

The path difference given by two-ray model is ___

(a) \(\frac{4πh_t h_r}{λd^2}\)

(b) \(\frac{4πh_t h_r}{d}\)

(c) \(\frac{4h_t h_r}{d}\)

(d) \(\frac{2h_t h_r}{d}\)

The question was asked in a job interview.

My doubt is from Radio Wave Propagation topic in section Radio Wave Propagation of Antennas

Answer 1

The correct answer is (d) \(\frac{2h_t h_r}{d}\)

To elaborate: The path difference given by two-ray model is \(\frac{2h_t h_r}{d}.\) and its phase difference is given as \(∅=\frac{2π}{λ} ∆x=\frac{4πh_t h_r}{d}.\)