What is Antenna Gain?

Antenna gain tells us the power transmitted by an antenna in a specific direction as compared to an isotropic antenna. This specification describes how strong a signal an antenna can send out or receive in a specified direction. Antenna Gain is a more important specification than directivity, as it takes in account all the losses.

Antenna gain = Directivity x Efficiency

Technically, Antenna Gain is the product of directivity and efficiency. Where Directivity is the measure of the concentration of an antenna’s radiation pattern in a particular direction and efficiency accounts for the losses of the antenna due to manufacturing faults, surface coating irregularities, dielectric, resistance, VSWR, or any other factor.