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

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

1.	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» 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 \(θ= 2 cos^{-1}⁡\frac{l}{l+δ} \).

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