Hence, an antenna's temperature will vary depending on whether it is directional and pointed into space or staring into the sun.
These concepts begin to illustrate how antenna engineers must understand receivers and the associated electronics, because the resulting systems very much depend on each other.
Satellite antenna aperture is closely related to the quality factor (G/T value) of the earth station.
The G/T value and satellite power demand, i.e. equivalent rent bandwidth, is a logarithmic linear relationship.
The earth station aperture should make a compromise between the space overhead (equivalent rent bandwidth) and ground overhead (antenna aperture) in order to make the system achieve optimum allocation.
Achievable G/T with current VSAT antenna in C & Ku Bands (Elevation Angle E=35 Degree) Diameter G/T 3.8m 21.7 7.5m 25.3 11m 31.7 [1] p. 32, Thomas A. Milligan, Modern Antenna Design, 2nd Edition, IEEE Press [2] p. 32, Thomas A. Milligan, Modern Antenna Design, 2nd Edition, IEEE Press This article incorporates public domain material from Federal Standard 1037C.