# Antenna Gain Calculator Antenna gain refers to the combination of the antenna's directivity and electrical efficiency. Antenna gain is found on the basis of Efficiency, Wave Length and Physical Aperture Area. In other words, the antenna gain is defined as the ratio of the power required at the input of a loss-free reference antenna to the power supplied to the input of the given antenna to produce. Antenna Gain is denoted by the symbol 'dB'. The 'dB' refers to decibel which is a unit of measure of loss or gain. In antenna gain, an antenna's effective length is proportional to the square root of the antenna's gain for a particular frequency and radiation resistance.
Antenna Gain Calculator
 Efficiency (η): Wave Length (λ): Physical Aperture Area (A): Antenna Gain:
Formula
GdBi = 10 LOG10 ( η4πA / λ2)

Where,
η = Efficiency
λ = Wave Length
A = Physical Aperture Area

The gain of an antenna (dbi) or antenna gain in a given direction is the amount of energy radiated in that direction compared to the energy an isotropic antenna would radiate in the same direction when driven with the same input power. The advanced online Antenna Gain Calculator is used to calculate the frequencies of antennas.

Example:
Calculate the Antenna Gain for the given details.
Efficiency (η) = 5
Wave Length (λ) = 10
Physical Aperture Area (A) = 15

Solution:
Apply Formula:
GdBi = 10 LOG10 ( η4πA / λ2)
GdBi = 9.74271
Antenna Gain (GdBi) = 9.74271

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