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    Posted: 29/September/2008 at 12:08
Antenna Gain Calculation
The antenna gain is calculated as follows:
Ant Gain = 4 x PI x 'efficient area' = dBi
                    wavelength (lamda)
PI = 3.1415927 approx
'efficient area' = antenna reflector area x antenna efficiency
Antenna efficiency is the ability of the antenna to radiate all of the power fed into it. An efficiency of 100% is theoretical but in practice not achievable. The average efficiency of an antenna is in the region of 70%, but often 60% is used as a worst case figure.
70% means that 30% of the input power is lost and this is due to factors such as mismatch, reflected power and imperfections. A reflector is not always a perfect reflector.
wavelength =  Speed of Light =   3 x 10^8
                       ------------------      --------------
                           frequency          frequency

Edited by Satcoms UK - 16/April/2015 at 22:47
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