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322 Chapter 17. Advanced communication Systems
Transponders
Satellite
Solar panel
Uplink Downlink
36000 km
Earth Earth
station Earth surface station
Figure 17.5: Satellite communication system
A transponder is a combination of receiver, amplifier and transmit-
ter. Receiver in the transponder amplifies the uplink signal and con-
verts it into another frequency downlink frequency. The block diagram
for the transponder is shown in Figure 17.6.
Transmitter/receiver
Antenna
Diplexer
Signal
Receiver Processing Transmitter
Figure 17.6: Block diagram for transponder
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