11-10-2017, 03:25 PM
A communications satellite is an artificial satellite that retransmits and amplifies radio telecommunication signals through a transponder; creates a communication channel between a source transmitter and a receiver in different parts of the Earth. Communications satellites are used for television, telephone, radio, internet and military applications. There are more than 2,000 communications satellites in Earth's orbit, used by private and government organizations.
Wireless communication uses electromagnetic waves to carry signals. These waves require a line of sight, and therefore are obstructed by the Earth's curvature. The purpose of communications satellites is to retransmit the signal around the Earth's curve allowing communication between widely separated points. Communications satellites use a wide range of radio and microwave frequencies. To avoid signal interference, international organizations have regulations for which frequency ranges or "bands" that certain organizations can use. This band allocation minimizes the risk of signal interference.