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Which of the following antenna radiates power with unit gain uniformly in all directions?

Which of the following antenna radiates power with unit gain uniformly in all directions? Correct Answer Isotropic antenna

Isotropic antenna radiates the power with unit gain uniformly in all directions. It is an ideal antenna. From practical point of view, there is no actual isotropic antenna. But, an isotropic antenna is often used as a reference antenna for the antenna gain.

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