Question

The average radiated power of half-wave dipole is given by ______

(a) \(73I_{rms}^2\)

(b) \(36.5I_{rms}^2\)

(c) \(13.25I_{rms}^2\)

(d) \(146I_{rms}^2\)

The question was posed to me by my school teacher while I was bunking the class.

My question is from Power Radiation from Half Wave Dipole topic in section Antenna Parameters – II of Antennas

Answer 1

Correct option is (a) \(73I_{rms}^2\)

To explain I would say: Radiation resistance of a half-wave dipole is 73Ω.

Average Power radiated from the half-wave dipole \(P_{avg}=I_{rms}^2 R=73I_{rms}^2\)

Radiation resistance of a quarter-wave monopole is 36.5Ω.