Question

Which of the following is the expression for tilt angle?

(a) \(θ=1/2 tan^{-1}⁡(\frac{σ}{ωϵ})\)

(b) \(θ=2 tan^{-1}⁡(\frac{σ}{ωϵ})\)

(c) \(θ=1/2 tan^{-1}⁡(\frac{σϵ}{ω})\)

(d) \(θ=2 tan^{-1}⁡(\frac{wϵ}{σ})\)

The question was posed to me in an interview.

Query is from Radio Wave Propagation topic in section Radio Wave Propagation of Antennas

Answer 1

Right answer is (a) \(θ=1/2 tan^{-1}⁡(\frac{σ}{ωϵ})\)

The explanation is: The wave tilt of the surface wave depends on the conductivity of earth, permittivity and angular frequency of the waves. Expression for tilt angle is \(θ=1/2 tan^{-1}⁡(\frac{σ}{ωϵ}). \)