1.

If the current input to the antenna is 100mA, then find the average power radiated from the half-wave dipole antenna?(a) 365mW(b) 0.356mW(c) 0.365mW(d) 356mWI had been asked this question during an interview.Origin of the question is Power Radiation from Half Wave Dipole topic in portion Antenna Parameters – II of Antennas

Answer»

Correct choice is (a) 365mW

Best EXPLANATION: Average POWER radiated from the half-wave dipole PAVG=\(I_{rms}^2 R=(\frac{I_m}{\SQRT 2})^2 R \)

Radiation resistance of a half-wave dipole is 73Ω.

Given Im=100mA=>Pavg=\((\frac{100×10^{-3}}{\sqrt 2})^2×73=365mW.\)



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