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Which is the standard reference antenna for the directive gain?

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Which is the standard reference antenna for the directive gain?

(a) Isotropic antenna

(b) Marconi antenna

(c) Helical antenna

(d) Log Periodic antenna

I got this question during an online interview.

My question is from Asynchronous TDM in chapter Multiplexing & Sampling of Bandpass Signal of Analog Communications

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Correct answer is (a) Isotropic antenna

Explanation: Isotropic antenna is an ideal antenna that radiates its power uniformly in all directions. In practical, no isotropic antenna exists. It is often used as a reference antenna for the antenna gain. Directive gain of a practical antenna is the ratio of the radiation intensity of the antenna to that of an isotropic antenna.

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