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If the power radiated by a quarter-wave monopole is 100mW then power radiated by a half wave dipole under same current input is _____(a) 100W(b) 100mW(c) 200W(d) 200mWThis question was posed to me in quiz.My query is from Power Radiation from Half Wave Dipole in chapter Antenna Parameters – II of Antennas

Answer»

The CORRECT OPTION is (d) 200mW

The explanation: 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)

⇨ Pavg-hlf = 2Pavg mono = 2*100mW=200mW



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