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Power radiated by a Hertzian dipole of length λ/30 and carrying a current 2A?(a) 0.87W(b) 3.51W(c) 2.51W(d) 8.77WThe question was posed to me during an interview.I want to ask this question from Radiation topic in division Radiation, Baluns & Polarization of Antennas

Answer»

Right option is (B) 3.51W

Explanation: POWER RADIATED by a HERTZIAN dipole Prad=Rrad I^2

Rrad = \(80\pi^2(\frac{L}{\lambda})^2=80\pi^2(\frac{\frac{\lambda}{30}}{\lambda})^2=0.877\Omega\)

Prad = Rrad I^2=0.877×2×2=3.51W


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