1.

The radiation resistance of an antenna having a power of 120 units and antenna current of 5A is(a) 4.8(b) 9.6(c) 3.6(d) 1.8This question was addressed to me during an interview.My doubt is from Power, Power Loss and Return Loss topic in section EM Wave Propagation of Electromagnetic Theory

Answer»

The correct choice is (a) 4.8

Easy explanation: The POWER of an ANTENNA is GIVEN by Prad = Ia^2 Rrad, where Ia is the antenna current and Rrad is the radiation resistance. On SUBSTITUTING the given data, we get Rrad = Prad/Ia^2 = 120/5^2 = 4.8 ohm.



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