Home > Satellite Communication > Link Budgeting Explained > Calculation of Transmit antenna gain

Uplink Path Loss Transmit EIRP

Link Power Budgetting

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 GT: The isotropic power gain of the antenna, GT, is defined as the power density in the maximum direction, denoted here by PD,to the power density archived by a 100% efficient isotropic radiator.

Thus

                           PT is the total power radiated.
         Antenna gain in GT  = 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]

Example    Calculation of the gain of a 3.80-m parabolaidal antenna operating frequency of 6.175 G Hz  & aperture efficiency of 0.55

Hence GT=45.21 dB 

Uplink Path Loss Transmit EIRP
     Home                                                Copyright (C) 2003-2011 TutorialsWeb.com                                   Disclaimer                                           Sitemap