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What is the input impedance to a lossless antenna, at resonance?(a) infinite(b) 0(c) resistive(d) capacitiveThis question was addressed to me during an interview.This interesting question is from Time Division Multiplexing topic in chapter Multiplexing & Sampling of Bandpass Signal of Analog Communications

Answer»

Right answer is (c) resistive

Explanation: In antenna IMPEDANCE, impedance related the VOLTAGE and CURRENT at the input of the antenna. The real part of antenna impedance represents power that is either radiated AWAY or absorbed within the antenna and the imaginary part of antenna impedance represents power that is stored in the NEAR field of antenna.The input impedance of a lossless antenna is purely resistive.



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