Re: For satellite communication, the downlink frequency is l
as we know the radiated power from the antenna at a distance r is inversely proportional to f² (f=frequency) and this is in any medium.
so as f increases the attenuation of the power will increase. so we need to increase the power from the source.
as there is a frequence for uplink and one for downlink so we choose the high f for the uplink because we can increase the sending power of the earth station which is difficult to make with the satellite because it has a certain amount of power to use it in the communications and to be in its orbit.