Energy gain of the antenna

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Antenna Power Gain - This is the ratio of the power density radiated by the antenna in a given direction U (Θ, φ) to the power density radiated by the antenna, usually the isotropic antenna, assuming the same power is applied to both antennas. Unlike directional gain, which depends only on the antenna radiation characteristics, it also takes into account its efficiency.

G ( & # x0398; , & # x03D5; ) = U ( & # x0398; , & # x03D5; ) P w e / 4 & # x03A0; {\displaystyle G(\Theta ,\phi )={\frac {U(\Theta ,\phi )}{P_{we}/4\Pi }}}

The most common energy gain of the antenna is given in relation to the isotropic antenna and expressed in dBi. It is also sometimes referred to as a dipole antenna and is expressed in dBd units.

The energy gain of an antenna depends on its directionality and the energy losses of the antenna resulting from the material from which it is made.

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