Discussion
The value of directivity of isotropic antenna is :
Answer: A
The directivity of an isotropic antenna is 1.
Directivity is the ratio of an antenna's maximum radiation intensity to the radiation intensity of an isotropic antenna radiating the same total power. An isotropic antenna radiates equally in all directions, so its maximum equals its average, and the ratio is 1 (0 dB).
It cannot be 0, which would mean no radiation, or 0.5, since the maximum intensity can never be below the average. Infinite directivity would need all power in a single direction, which no real antenna achieves.
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