Discussion
How is the directivity of an antenna defined?
Answer: A
Directivity compares the intensity in the strongest direction with the intensity an isotropic radiator of the same total power would give in every direction. It is a property of the pattern alone and takes no account of losses. Radiated over accepted power is the radiation efficiency, comparison with a dipole gives gain in dBd, and the aperture relation is a formula for directivity rather than its definition. Gain is directivity multiplied by efficiency.
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