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An isotropic radiator is one which radiates energy 

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  1. in a well-defined direction
  2. uniformly in all directions
  3. inside a hollow space
  4. uniformly in the horizontal plane

Answer (Detailed Solution Below)

Option 2 : uniformly in all directions
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Detailed Solution

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An isotropic radiator is a theoretical point source of electromagnetic (or) sound waves that radiate the same intensity of radiation in all directions.

The radiation pattern is as shown:

 

Extra Concept:

  • The isotropic radiator has a gain of unity, which means having a gain factor of 1 in all directions.
  • In terms of dB, it can be called as 0 dB gain
  • Real antennas are not isotropic radiations but have a pattern of more and less power in different directions.

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