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Which of the following is called an ideal antenna?

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Which of the following is called an ideal antenna?

(a) Dipole antenna

(b) Directional antenna

(c) Isotropic antenna

(d) Loop antenna

I have been asked this question in semester exam.

My question is taken from Free Space Propagation Model in division Mobile Radio Propagation: Large – Scale Path Loss of Wireless/Mobile

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Correct choice is (c) Isotropic antenna

Explanation: Isotropic antenna is an ideal antenna that directs the power uniformly in all directions. It is a theoretical point source of electromagnetic. It is practically not possible. It is mainly used as a hypothetical antenna to measure the gain.

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