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If the power radiated by a half wave dipole is 100mW then power radiated by a quarter wave monopole under same current input is _____(a) 50mW(b) 200mW(c) 100mW(d) 50WI had been asked this question at a job interview.My question is from Power Radiation from Half Wave Dipole topic in section Antenna Parameters – II of Antennas

Answer»

Correct answer is (a) 50mW

To ELABORATE: Average POWER radiated from the half-wave dipole \(P_{AVG-HLF}=I_{rms}^2 R_{hlf}\)

⇨ \(\frac{P_{avg-hlf}}{P_{avg\, mono}} = \frac{R_{hlf}}{R_{mono}} = \frac{73}{36.5}=2\) (under same CURRENT)

\(P_{avg \,mono}=\frac{P_{avg-hlf}}{2}=\frac{100mW}{2}=50mW.\)



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