Antenna Technology by Zana Lane

By Zana Lane

This booklet is a whole package deal for wisdom sharing on Antenna expertise. desk of Contents bankruptcy 1 - Dipole Antenna bankruptcy 2 - Horn Antenna bankruptcy three - Radio Telescope bankruptcy four - Parabolic Antenna bankruptcy five - Antenna (Radio) bankruptcy 6 - tv Antenna bankruptcy 7 - Radio Masts and Towers bankruptcy eight - Omnidirectional Antenna & Directional Antenna

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Antenna Technology

This ebook is an entire package deal for wisdom sharing on Antenna expertise. desk of Contents bankruptcy 1 - Dipole Antenna bankruptcy 2 - Horn Antenna bankruptcy three - Radio Telescope bankruptcy four - Parabolic Antenna bankruptcy five - Antenna (Radio) bankruptcy 6 - tv Antenna bankruptcy 7 - Radio Masts and Towers bankruptcy eight - Omnidirectional Antenna & Directional Antenna

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A parabolic antenna is an antenna that uses a parabolic reflector, a surface with the cross-sectional shape of a parabola, to direct the radio waves. The most common form is shaped like a dish and is popularly called a dish antenna or parabolic dish. The main advantage of a parabolic antenna is that it is highly directive; it functions analogously to a searchlight or flashlight reflector to direct the radio waves in a narrow beam, or receive radio waves from one particular direction only. Parabolic antennas have some of the highest gains, that is they can produce the narrowest beam width angles, of any antenna type.

Alternatively, a radio transmitter will produce a large radio frequency current that may be applied to the terminals of the same antenna in order to convert it into an electromagnetic wave (radio wave) radiated into free space. Antennas are thus essential to the operation of all radio equipment, both transmitters and receivers. They are used in systems such as radio and television broadcasting, two-way radio, wireless LAN, mobile telephony, radar, and satellite communications. Typically an antenna consists of an arrangement of metallic conductors (or "elements") with an electrical connection (often through a transmission line) to the receiver or transmitter.

They are also widely used for terrestrial microwave relay links, ground based and airborne radar antennas, wireless WAN/LAN links, satellite and spacecraft communication antennas, and radio telescopes. History The idea of using parabolic reflectors for radio antennas was taken from optics, where the power of a parabolic mirror to focus light into a beam has been known since classical antiquity. The designs of some specific types of parabolic antenna, such as the Cassegrain and Gregorian, come from similarly named analogous types of reflecting telescope, which were invented by astronomers during the 15th century.

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