Parabolic antenna

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In the field of telecommunications, parabolic antenna is an open antenna with a parabolic mirror, called reflector, and can be used both in transmission and in reception. When used in reception, it is equipped with a receiving element incorporating a low noise amplifier (LNA) and often a frequency converter. In this case, the integrated element is called the low noise block converter (LNBC or LNB). When used in broadcast, the parabolic antenna is equipped with a transmitting element that takes the name of an illuminator, or feeder, often consisting of a small trumpet antenna. The main features of this type of antenna are the high directivity and gain: 1] these magnitudes depend on the ratio between its effective diameter and the wavelength used in the transmission-transmission: the higher the higher the ratio is the Gain and directivity. Small receiver antennas (diameters of 60 cm) are used, for example, to receive television broadcasts from telecommunications satellites located in geostationary orbit. Larger parabolic antennas are used in radio bridge systems, while large parabolic antennas, with diameters reaching more than 30 m, are used for communications between satellites and their ground control stations, such as satellite networks. #antenna #Parabolic_antenna