When the antenna diameter is doubled the gain of the antenna?
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Antenna gain is the measure of the. directionality of an antenna. It is defined as the output power radiated in a particular direction compared to the power output in any direction by an isotropic omnidirectional antenna. The increase in power output in one particular direction is at the expense of power radiated in other directions. That is, power output can be increased in one direction by decreasing it in other directions. Another concept related to the antenna gain is effective area. Effective area of an antenna is related to the physical size and shape of an antenna.
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