Question

Reflection coefficient of plane waves with normal incidence in terms of impedances of medium is ____

(a) \(γ_r=\frac{η_2-η_1}{η_2+η_1} \)

(b) \(γ_r=\frac{2η_2}{η_2+η_1} \)

(c) \(γ_r=\frac{2η_1}{η_2+η_1} \)

(d) \(γ_r=\frac{η_2+η_1}{η_2-η_1} \)

The question was posed to me in examination.

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

Answer 1

The correct choice is (a) \(γ_r=\frac{η_2-η_1}{η_2+η_1} \)

The best I can explain: The reflection factor is given by the ratio of Reflected wave to incident wave.

\(ρ=\frac{reflected\, wave}{incident\, wave}=\frac{E_r}{E_i} \)

Reflection coefficient of plane waves with normal incidence in terms of impedances of medium is \(γ_r=\frac{η_2-η_1}{η_2+η_1} \)