Question

Transmission coefficient of a plane wave with normal incidence is _________

(a) \(γ_t=\frac{2η_2}{η_2+η_1} \)

(b) \(γ_t=\frac{η_2}{η_2+η_1} \)

(c) \(γ_t=\frac{2η_2}{η_2+η_1} \)

(d) \(γ_r=\frac{η_2-η_1}{η_2+η_1} \)

I have been asked this question in a national level competition.

I want to ask this question from Radio Wave Propagation in section Radio Wave Propagation of Antennas

Answer 1

Correct answer is (a) \(γ_t=\frac{2η_2}{η_2+η_1} \)

For explanation: Transmission coefficient is the ratio of transmitted to incident wave. Relation between transmission coefficient γt and reflection coefficient is γr is γr = γt-1.

So the Transmission coefficient of a plane wave with normal incidence is \(γ_t=\frac{2η_2}{η_2+η_1} \)