The value at which the second null occurs in H-plane of rectangular aperture of a*b is given by ____(a) sin^-1⁡(2λ/a)(b) sin^-1⁡(λ/a)(c) sin^-1⁡(a/2λ)(d) sin^-1⁡(a/λ)This question was posed to me during a job interview.I would like to ask this question from Aperture Antenna in portion Aperture Antenna of Antennas

The value at which the second null occurs in H-plane of rectangular ap

1.	The value at which the second null occurs in H-plane of rectangular aperture of a*b is given by ____(a) sin^-1⁡(2λ/a)(b) sin^-1⁡(λ/a)(c) sin^-1⁡(a/2λ)(d) sin^-1⁡(a/λ)This question was posed to me during a job interview.I would like to ask this question from Aperture Antenna in portion Aperture Antenna of Antennas
Answer» CORRECT option is (a) sin^-1⁡(2λ/a) Explanation: The area the POWER is radiated is given by Beam-width. The beam-width between the first nulls is the FNBW. For H-plane \(\frac{ka}{2}\) sinθ=nπ ⇨ θ= sin^-1⁡(nλ/a) ⇨ For null n=2θ= sin^-1⁡(2λ/a).

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