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- Antenna_(radio) abstract "An antenna (or aerial) is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (i.e. a high frequency alternating current (AC)) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.Antennas are essential components of all equipment that uses radio. They are used in systems such as radio broadcasting, broadcast television, two-way radio, communications receivers, radar, cell phones, and satellite communications, as well as other devices such as garage door openers, wireless microphones, bluetooth enabled devices, wireless computer networks, baby monitors, and RFID tags on merchandise.Typically an antenna consists of an arrangement of metallic conductors (elements), electrically connected (often through a transmission line) to the receiver or transmitter. An oscillating current of electrons forced through the antenna by a transmitter will create an oscillating magnetic field around the antenna elements, while the charge of the electrons also creates an oscillating electric field along the elements. These time-varying fields radiate away from the antenna into space as a moving transverse electromagnetic field wave. Conversely, during reception, the oscillating electric and magnetic fields of an incoming radio wave exert force on the electrons in the antenna elements, causing them to move back and forth, creating oscillating currents in the antenna.Antennas may also include reflective or directive elements or surfaces not connected to the transmitter or receiver, such as parasitic elements, parabolic reflectors or horns, which serve to direct the radio waves into a beam or other desired radiation pattern. Antennas can be designed to transmit or receive radio waves in all directions equally (omnidirectional antennas), or transmit them in a beam in a particular direction, and receive from that one direction only (directional or high gain antennas).The first antennas were built in 1888 by German physicist Heinrich Hertz in his pioneering experiments to prove the existence of electromagnetic waves predicted by the theory of James Clerk Maxwell. Hertz placed dipole antennas at the focal point of parabolic reflectors for both transmitting and receiving. He published his work in Annalen der Physik und Chemie (vol. 36, 1889).".
- Antenna_(radio) thumbnail AntennaSymbol.png?width=300.
- Antenna_(radio) wikiPageExternalLink aerial%20positioningtests.html.
- Antenna_(radio) wikiPageExternalLink aerials.html.
- Antenna_(radio) wikiPageExternalLink FMandDABaerialTests.
- Antenna_(radio) wikiPageExternalLink www.antenna-theory.com.
- Antenna_(radio) wikiPageExternalLink www.antennas.gr.
- Antenna_(radio) wikiPageExternalLink 1_5_PRODUCTS.html.
- Antenna_(radio) wikiPageExternalLink 0105downs.pdf.
- Antenna_(radio) wikiPageExternalLink qsl-antenna4.htm.
- Antenna_(radio) wikiPageExternalLink emfields.pdf.
- Antenna_(radio) wikiPageExternalLink kbaseresultdetl?id=2146.
- Antenna_(radio) wikiPageExternalLink www.dipoleanimator.com.
- Antenna_(radio) wikiPageExternalLink Antennas.
- Antenna_(radio) wikiPageExternalLink ewa.
- Antenna_(radio) wikiPageExternalLink mwt_mpa.htm.
- Antenna_(radio) wikiPageExternalLink tut_1.htm.
- Antenna_(radio) wikiPageExternalLink index.htm.
- Antenna_(radio) wikiPageExternalLink index.htm.
- Antenna_(radio) wikiPageExternalLink index.php?page=technical-documents-and-calculators.
- Antenna_(radio) wikiPageExternalLink article-27.
- Antenna_(radio) wikiPageExternalLink microwave-antenna-design-calculator.
- Antenna_(radio) wikiPageExternalLink Diyantennas.html.
- Antenna_(radio) wikiPageExternalLink defs343.htm.
- Antenna_(radio) wikiPageExternalLink simusoft_twoaerials.html.
- Antenna_(radio) wikiPageExternalLink 65969707?tab=editions.
- Antenna_(radio) wikiPageExternalLink ~chenzn.
- Antenna_(radio) wikiPageID "187317".
- Antenna_(radio) wikiPageRevisionID "606005334".
- Antenna_(radio) hasPhotoCollection Antenna_(radio).
- Antenna_(radio) subject Category:Antennas_(radio).
- Antenna_(radio) subject Category:Radio_electronics.
- Antenna_(radio) comment "An antenna (or aerial) is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency (i.e. a high frequency alternating current (AC)) to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves).".
- Antenna_(radio) label "Antena".
- Antenna_(radio) label "Antena".
- Antenna_(radio) label "Antena".
- Antenna_(radio) label "Antenna (radio)".
- Antenna_(radio) label "Antenna".
- Antenna_(radio) label "Antenne (straling)".
- Antenna_(radio) label "Antenne radioélectrique".
- Antenna_(radio) label "Antennentechnik".
- Antenna_(radio) label "Антенна".
- Antenna_(radio) label "هوائي".
- Antenna_(radio) label "アンテナ".
- Antenna_(radio) label "天线".
- Antenna_(radio) sameAs Anténa.
- Antenna_(radio) sameAs Antennentechnik.
- Antenna_(radio) sameAs Κεραία.
- Antenna_(radio) sameAs Antena.
- Antenna_(radio) sameAs Antena.
- Antenna_(radio) sameAs Antenne_radioélectrique.
- Antenna_(radio) sameAs Antena_(radio).
- Antenna_(radio) sameAs Antenna.
- Antenna_(radio) sameAs アンテナ.
- Antenna_(radio) sameAs 안테나.
- Antenna_(radio) sameAs Antenne_(straling).
- Antenna_(radio) sameAs Antena.
- Antenna_(radio) sameAs Antena.
- Antenna_(radio) sameAs m.019mbd.
- Antenna_(radio) sameAs Q131214.
- Antenna_(radio) sameAs Q131214.
- Antenna_(radio) wasDerivedFrom Antenna_(radio)?oldid=606005334.
- Antenna_(radio) depiction AntennaSymbol.png.
- Antenna_(radio) isPrimaryTopicOf Antenna_(radio).