Question

Find the flare angle of the H-plane horn with aperture 12λ and path travel difference 0.4λ?

(a) 15.18°

(b) 7.09°

(c) 30.18°

(d) 1.518°

I had been asked this question in an online quiz.

This intriguing question originated from Design topic in section Horn Antenna of Antennas

Answer 1

The correct choice is (a) 15.18°

For explanation I would say: Length of the H-plane horn \(ρ =\frac{h^2}{8δ}=\frac{(12λ)^2}{8×0.4λ}=45 λ\)

Flare angle of the H-plane horn = \(2tan^{-1}⁡\frac{h}{2ρ}=2×tan^{-1}⁡\frac{12λ}{2×45λ}=15.18°\)