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ID: 114589
Article: Antenna (radio)
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[[File:Moosbrunn SW Antenna.jpg|thumb|right|Short wave [[HRS type antennas|"curtain" antenna]] (Moosbrunn, Austria)]]
[[File:Moosbrunn SW Antenna.jpg|thumb|right|Short wave [[HRS type antennas|"curtain" antenna]] (Moosbrunn, Austria)]]
An '''antenna''' (or '''aerial''') is a [[transducer]] that [[transmitter|transmits]] or [[receiver (radio)|receives]] [[electromagnetic radiation|electromagnetic wave]]s. In other words, antennas convert electromagnetic radiation into electric current, or vice versa. Antennas generally deal in the transmission and reception of [[radio wave]]s, and are a necessary part of all [[radio]] equipment. Antennas are used in systems such as [[radio]] and [[television]] broadcasting, point-to-point radio communication, [[wireless LAN]], [[cell phone]]s, [[radar]], and [[spacecraft]] communication. Antennas are most commonly employed in air or [[outer space]], but can also be operated under water or even through soil and rock at certain frequencies for short distances.
Physically, an antenna is an arrangement of one or more [[conductor (material)|conductor]]s, usually called ''elements'' in this context. In transmission, an [[alternating current]] is created in the elements by applying a voltage at the antenna terminals, causing the elements to radiate an [[electromagnetic field]]. In reception, the inverse occurs: an electromagnetic field from another source [[Radio-frequency induction|induces]] an alternating current in the elements and a corresponding voltage at the antenna's terminals. Some receiving antennas (such as [[parabolic antenna|parabolic]] and [[Horn antenna|horn]] types) incorporate shaped reflective surfaces to collect the radio waves striking them and direct or focus them onto the actual conductive elements.
Some of the first rudimentary antennas were built in 1888 by [[Heinrich Hertz]] (1857–1894) in his pioneering experiments to prove the existence of electromagnetic waves predicted by the theory of [[James Clerk Maxwell]]. Hertz placed the [[Emission (electromagnetic radiation)|emitter]] [[dipole]] in the focal point of a [[parabolic reflector]]. He published his work and installation drawings in ''[[Annalen der Physik und Chemie]]'' (vol. 36, 1889).
Reason: ANN scored at 0.924949
Reporter Information
Reporter: gordon (anonymous)
Date: Saturday, the 15th of October 2016 at 10:16:45 AM
Status: Reported
Thursday, the 23rd of April 2015 at 01:15:09 AM #99088
gordon (anonymous)


Saturday, the 15th of October 2016 at 10:16:45 AM #106593
gordon (anonymous)


Sunday, the 5th of March 2017 at 05:57:06 PM #108466

Not a false positive.