2.Calculation of Transmit antenna gain  

1.Antenna diameter  
               Diameter of parabolic reflector antenna is referred as antenna diameter. It is denoted by ‘D’ 

2.Antenna efficiency 
              Antenna efficiency is the ratio of input power to the radiated power of the antenna. It is denoted by ‘h’. The value of ‘h’ lice between 0.55 to 0.73

3.Antenna gain G_T 
        The isotropic power gain of the antenna, G_T, is defined as the power density in the maximum direction, denoted here by P_{D ,} to the power density archived by a 100%  efficient isotropic radiator.

Thus                                        G_T=P_D/(P_T/4p)
                           P_T is the total power radiated.
         Antenna gain in G_T   = 10 log (p²D²h/(l²*100))
                                           = 10 log (p²D²h/((C/f)²*100))
                                            =10 log (p²D²h/((3/10*f)²*100))
                                            =10 log (p²D²h/(3/f)²)……………(dB)………..[2] 

HOME   UP