Enter the antenna efficiency, wavelength, and aperture area into the calculator to determine the antenna gain of the antenna system.

Antenna Gain Formula

The following formula can be used to calculate the gain of an antenna.

G = 10 LOG ( n4πA / w2)
  • G is the antenna gain
  • n= Efficiency
  • w = Wave Length
  • A = Physical Aperture Area

To calculate the antenna gain, multiply 10 by the LOG of the product of the efficiency, 4pi, and the physical aperture area, divided by 2 times the wavelength.

Antenna Gain Definition

Antenna gain is a measure of the efficiency that an antenna converts input energy into radio waves.

Antenna Gain Example

How to calculate antenna gain?

  1. First, determine the efficiency.

    Measure the electrical efficiency of the antenna.

  2. Next, determine the wave length.

    Calculate the wave length of the waves produces by the antenna.

  3. Next, determine the physical aperture area.

    Measure the total aperture area.

  4. Finally, calculate the antenna gain.

    Calculate the antenna gain using the equation above.


What factors affect antenna efficiency?

Antenna efficiency is influenced by factors such as the material used in the antenna’s construction, its design, the surrounding environment, and how well it is matched to the transmitter or receiver circuitry.

Why is wavelength important in calculating antenna gain?

The wavelength of the signal plays a crucial role in calculating antenna gain because it directly affects the antenna’s size and shape requirements for efficient operation. A correctly sized antenna for a given wavelength can significantly improve its gain and overall performance.

Can antenna gain be improved by increasing the aperture area?

Yes, increasing the physical aperture area of an antenna can improve its gain. A larger aperture allows the antenna to capture more of the incoming signal or radiate more power, thereby increasing its efficiency and the overall gain of the system.