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How the directivity and effective aperture related to each other?

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How the directivity and effective aperture related to each other?

(a) Inversely proportional

(b) Directly proportional

(c) Independent

(d) Proportionality depends on input power

This question was posed to me in an online quiz.

My query is from Directivity in division Antenna Parameters of Antennas

1 Answer

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Best answer
The correct answer is (b) Directly proportional

To elaborate: The directivity D is directly proportional to the effective aperture of antenna. \(A_e=D\frac{\lambda^2}{4\pi}\)

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