I was able to gather some answers as to why is so.
Uplink and downlink frequency range in satellite communication.
This frequency is called as downlink frequency.
There are two main ways to duplex these two signals plus a third under development.
Carrier processor performs the frequency down conversion of received signal uplink.
But my seniors in my company seem not to be satisfied with the below answers.
Ka band 26 40 ghz communications satellites.
Because of its weaker power it requires a larger antenna usually above 1 8m 6ft.
High frequency means higher attenuation.
C band satellite will usually will have 5 925 to 6 425 ghz frequency range in the uplink and 3 7 to 4 2 ghz frequency range in the downlink.
5925 mhz to 6425 mhz is uplink band where as 3700 to 4200 mhz is downlink band.
In europe ku band downlink is used from 10 7 ghz to 12 75 ghz for direct broadcast satellite services such as astra.
The satellite transponder converts this signal into another frequency and sends it down to the second earth station.
Finally at the lowest end of the satellite transmission range the c band operates between 3 7 and 4 2 ghz downlink and is ideal for voice and data transmission because its lower.
The higher the frequency the more is the signal loss and more power is needed for reliable transmission.
The c band is primarily used for voice and data communications as well as backhauling.
However due to the lower frequency range it performs better under adverse weather conditions on the ground.
The lower frequency x band between 7 25 and 7 75 ghz downlink is a low frequency signal used predominantly by military forces for long range communications.
Low noise amplifier lna amplifies the weak received signal.
The downlink is in the other direction.
Uplink frequencies are higher than the corresponding downlink frequencies in the case of satellite communication.
Ku band satellite will have 14 to 14 5 ghz range in the uplink and 11 7 to 12 2 ghz frequency range in the downlink.
In satellite communication the signals have to cross the atmosphere which presents a great deal of attenuation.
It receives uplink signal from the satellite antenna and transmits downlink signal to the satellite antenna.
The process of satellite communication begins at an earth station.
6ghz band frequency is used for uplink and 4ghz frequency band is used for downlink in c band satellite communication operation.
So lets suppose that bts as in case of gsm transmits using low frequency on the downlink.
With the variety of satellite frequency bands that can be used designations have been developed so that they can be referred to easily.
The direction from vsats to sallite is known as uplink and the direction from satellite to vsats is known as downlink.
This block determines the type of transponder.
