Question

Flare angle (in degrees) of horn antenna when axial length 10λ and path difference δ = 0.3λ is given is _____

(a) θ = 1.386

(b) θ = 2.772

(c) θ = 27.72

(d) θ = 13.86

The question was asked in unit test.

I need to ask this question from Design in section Horn Antenna of Antennas

Answer 1

Right answer is (c) θ = 27.72

Explanation: Flare angle of horn antenna when axial length l and path difference d is given is

\(θ = 2 cos^{-1}⁡\frac{l}{l+δ}=2 cos^{-1}⁡\frac{10λ}{10.3λ}=27.72\)