Telecommunication is the extension of communication over a distance. In practice it also recognizes that something may be lost in the
process; hence the term 'telecommunication' covers all forms of distance
and/or conversion of the original communications, including radio,
telegraphy, television, telephony, data communication and computer
networking.
The elements of a telecommunication system are a transmitter, a medium and possibly a channel imposed upon the medium
and a receiver. The transmitter is a device that transforms or encodes the message into a physical
phenomenon; the signal. The transmission medium, by its physical nature, is likely to modify or degrade the signal on its path from the transmitter to the
receiver.
The receiver has a decoding mechanism capable of recovering the message within certain limits of signal
degradation. In some cases, the final "receiver" is the human eye
and/or ear and the recovery of the message is done by the brain.
Most simply, an antenna is an electronic component designed to send or receive radio
waves.
More specifically, an antenna is an arrangement of conductors designed to radiate
(transmit) an electromagnetic field in response to an applied alternating electromotive force
(EMF) and the associated alternating electric current. |
