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Radiation resistance of an antenna is ________

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Radiation resistance of an antenna is ________

(a) a dc resistance

(b) an ac resistance

(c) a constant value

(d) neither ac nor dc resistance

I had been asked this question during an online interview.

Question is from Time Domain Description in division Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct choice is (b) an ac resistance

Explanation: Radiation resistance is that part of an antenna that is caused by the radiation of electromagnetic waves from the antenna. It is considered to be an equivalent resistance dissipating the same amount of power as an actual antenna would have radiated. Radiation resistance of an antenna is usually an ac resistance.

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