why frequency band for uplink and downlink is different in transmission of microwaves through space
Answers
Answer:
Uplink frequency is kept higher than Downlink frequency for the following reasons:
At higher frequency attenuation is more hence more power will be required for signal transmission to ensure that it reaches the destination with the required minimum power. Higher power requirements involve the use of high power amplifiers with high ratings and heat sinks. This will increase the weight and power supply ratings will not make any difference. However for the satellite this will result in higher power consumption, which results in avoidable inefficiency.
The earth station antenna must direct the beam towards the satellite with as little spill over as possible i.e. the antenna must have high directivity. Beam width (measure if directional property) of the antenna is directly proportional to wavelength. Higher frequency means lesser wavelength and hence lower beam width, which implies greater directivity.
Answer:
At higher frequency attenuation is more hence more power will be required for signal transmission to ensure that it reaches the destination with the required minimum power. Higher power requirements involve the use of high power amplifiers with high ratings and heat sinks. This will increase the weight and power supply ratings will not make any difference. However for the satellite this will result in higher power consumption, which results in avoidable inefficiency.
Explanation: