Define gain of an antenna. What is the significance of gain of an antenna?/Relate the gain and directivity of an antenna through proper expression.

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20. Define gain of an antenna. What is the significance of gain of an antenna?/Relate the gain and directivity of an antenna through proper expression. 

The gain of the antenna is closely related to the directivity, it is a measure that takes into account the efficiency of the antenna as well as its directional capabilities.

Antenna gain is defined as the product of directivity and efficiency:

gain of the antenna

Thus, gain is always less than or equal to directivity.

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