Question

What is the effective aperture of Hertzian dipole antenna operating at frequency 100 MHz?

(a) 1.07m^2

(b) 0.17m^2

(c) 1.7m^2

(d) 1.2m^2

I had been asked this question during an internship interview.

I need to ask this question from Effective Aperture in division Antenna Parameters of Antennas

Answer 1

Correct option is (a) 1.07m^2

To elaborate: Effective aperture for a Hertzian dipole is given by \(A_e=1.5\frac{\lambda^2}{4\pi} \)

Gain of Hertzian dipole is 1.5

\(\lambda=\frac{c}{f}=\frac{3×10^8}{100×10^6}=3m\)

\(A_e=1.5 \frac{\lambda^2}{4\pi} =1.5\frac{3^2}{4\pi} =1.07m^2\)