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For a circular aperture the FNBW is ______

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For a circular aperture the FNBW is ______

(a) 140λ/D

(b) 70λ/D

(c) 140D/λ

(d) 70D/λ

This question was posed to me by my college professor while I was bunking the class.

My doubt is from Aperture Antenna topic in division Aperture Antenna of Antennas

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Right answer is (a) 140λ/D

The explanation is: The area the power is radiated is given by Beam-width. The beam-width between the first nulls is the FNBW. For circular aperture the FNBW is given by 140λ/D. The half-power beam width is given by 70λ/D.

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