Question

Flare angle of horn antenna when axial length l and path difference δ is given is _____

(a) \(θ= 2 cos^{-1}⁡\frac{l}{l+δ} \)

(b) \(θ=  cos^{-1}⁡\frac{l}{l+δ} \)

(c) \(θ= 2 cos^{-1}⁡\frac{l}{l-δ} \)

(d) \(θ=  cos^{-1}⁡\frac{l}{l-δ} \)

This question was addressed to me in quiz.

Query is from Design in chapter Horn Antenna of Antennas

Answer 1

Right answer is (a) \(θ= 2 cos^{-1}⁡\frac{l}{l+δ} \)

To explain I would say: Flare angle of horn antenna when axial length l and path difference d is given is

\(θ= 2 cos^{-1}⁡\frac{l}{l+δ} \).