Antennas (antenna) is a electronic components can radiation or collect electromagnetic waves. There are many types of antennas: dipole antennas, antenna arrays. In a radio communication system, the antenna has two basic functions. The main function is to emit RF signals from the transmitter as radio waves or radio waves to convert the RF signals to process in the receiver. Other functions of the antennas is to direct the radiation energy in one or more of the desired direction, or "feel" of the signal from one or more of the desired direction while the remaining direction often is locked again.The antenna has many applications in many areas: -Medicine: ultrasound, screening-Survey: mining and exploration geology, ...-Military: Rada, information, submarines, missile guidance, Minesweeper ...In telecommunications radio communication information, voice transmission, data transmission, television transmission, video ... We divided the information according to the frequency. Most of the bands were to be telecommunication applications (often seen as the Viba). Depending on the characteristics of each frequency that has applications that transmit information differently. They all need to have the antenna.
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