Define directivity of an antenna.

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14. Define directivity of an antenna.

The directivity(D) of an antenna is defined as the ratio of the maximum value of the power radiated per unit solid angle to the average power radiated per unit solid angle. That is, directivity is ratio of the maximum radiation intensity in the main beam to the average radiation intensity over all space.

directivity of an antenna

Thus, the directivity measures how intensely the antenna radiates in its preferred direction than an isotropic radiator would when fed with the same total power. Directivity is a dimensionless ratio of power, and is usually expressed in dB as D(dB) = 10 log(D)

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