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What (who) is dipole antenna - definition
Dipole antenna
![Feedpoint impedance of (near-) half-wave dipoles versus electrical length in wavelengths. Black: [[radiation resistance]]; blue: reactance for 4 different values of conductor diameter.](https://commons.wikimedia.org/wiki/Special:FilePath/DipoleImpedance.png?width=200 "Feedpoint impedance of (near-) half-wave dipoles versus electrical length in wavelengths. Black: [[radiation resistance]]; blue: reactance for 4 different values of conductor diameter.")
![induced EMF method]], an approximation that breaks down at larger conductor diameters (dashed portion of graph).](https://commons.wikimedia.org/wiki/Special:FilePath/DipoleReductionFactor.jpg?width=200 "induced EMF method]], an approximation that breaks down at larger conductor diameters (dashed portion of graph).")
![Q factor]] that the feed voltage is much smaller in relation to the standing wave. Since the antenna is fed at its resonant frequency, the input voltage is in phase with the current (blue bar), so the antenna presents a pure resistance to the feedline. The energy from the driving current provides the energy radiated as radio waves. In a receiving antenna the phase of the voltage at the transmission line would be reversed, since the receiver absorbs energy from the antenna.](https://commons.wikimedia.org/wiki/Special:FilePath/Dipole antenna standing waves animation 6 - 5fps.gif?width=200 "Q factor]] that the feed voltage is much smaller in relation to the standing wave. Since the antenna is fed at its resonant frequency, the input voltage is in phase with the current (blue bar), so the antenna presents a pure resistance to the feedline. The energy from the driving current provides the energy radiated as radio waves. In a receiving antenna the phase of the voltage at the transmission line would be reversed, since the receiver absorbs energy from the antenna.")
![Dipole antenna used by the [[radar altimeter]] in an airplane](https://commons.wikimedia.org/wiki/Special:FilePath/Dipole radar altimeter antenna.jpg?width=200 "Dipole antenna used by the [[radar altimeter]] in an airplane")
![Animated diagram of a [[half-wave dipole]] antenna receiving a radio wave. The antenna consists of two metal rods connected to a receiver ''R''. The [[electric field]] ''(<span style="color:green;">E, green arrows</span>)'' of the incoming wave pushes the [[electron]]s in the rods back and forth, charging the ends alternately positive ''<span style="color:red;">(+)</span>'' and negative ''<span style="color:blue;">(−)</span>''. Since the length of the antenna is one half the [[wavelength]] of the wave, the oscillating field induces [[standing wave]]s of voltage ''(<span style="color:red;">V, represented by red band</span>)'' and current in the rods. The oscillating currents ''(black arrows)'' flow down the transmission line and through the receiver (represented by the resistance ''R'').](https://commons.wikimedia.org/wiki/Special:FilePath/Dipole receiving antenna animation 6 800x394x150ms.gif?width=200 "Animated diagram of a [[half-wave dipole]] antenna receiving a radio wave. The antenna consists of two metal rods connected to a receiver ''R''. The [[electric field]] ''(<span style=\"color:green;\">E, green arrows</span>)'' of the incoming wave pushes the [[electron]]s in the rods back and forth, charging the ends alternately positive ''<span style=\"color:red;\">(+)</span>'' and negative ''<span style=\"color:blue;\">(−)</span>''. Since the length of the antenna is one half the [[wavelength]] of the wave, the oscillating field induces [[standing wave]]s of voltage ''(<span style=\"color:red;\">V, represented by red band</span>)'' and current in the rods. The oscillating currents ''(black arrows)'' flow down the transmission line and through the receiver (represented by the resistance ''R'').")
!["Rabbit-ears" VHF [[television antenna]] (the small loop is a separate UHF antenna).](https://commons.wikimedia.org/wiki/Special:FilePath/Rabbit-ears dipole antenna with UHF loop 20090204.jpg?width=200 "\"Rabbit-ears\" VHF [[television antenna]] (the small loop is a separate UHF antenna).")
![A [[reflective array antenna]] for radar consisting of numerous dipoles fed in-phase (thus realizing a ''broadside array'') in front of a large reflector (horizontal wires) to make it uni-directional.](https://commons.wikimedia.org/wiki/Special:FilePath/SCR-270 Radar Antenna2.jpg?width=200 "A [[reflective array antenna]] for radar consisting of numerous dipoles fed in-phase (thus realizing a ''broadside array'') in front of a large reflector (horizontal wires) to make it uni-directional.")
![UTR-2]] radio telescope. The 8 m by 1.8 m diameter galvanized steel wire dipoles have a bandwidth of 8–33 MHz.](https://commons.wikimedia.org/wiki/Special:FilePath/UTR-2 - P3094042 (wiki).jpg?width=200 "UTR-2]] radio telescope. The 8 m by 1.8 m diameter galvanized steel wire dipoles have a bandwidth of 8–33 MHz.")
ANTENNA
Half wave radiator; Quater wave radiator; Dipole Antenna; Hertz antenna; Hertzian dipole; Hertzian Dipole; Quarter wave receiver; Off Center Fed antenna; Folded dipole; Dipole aerial; Half-wave antenna; Half wave dipole; Doublet antenna; Half-wave dipole; Rabbit ear antenna; Doublet Antenna; Half-wave radiator
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating structure supporting a line current so energized that the current has only one node at each end.
Electric dipole moment
!['''E'''-field]] (not shown) coincide everywhere with those of the '''D'''-field, but inside the sphere, their density is lower, corresponding to the fact that the '''E'''-field is weaker inside the sphere than outside. Many of the external '''E'''-field lines terminate on the surface of the sphere, where there is a bound charge.](https://commons.wikimedia.org/wiki/Special:FilePath/Dielectric sphere.svg?width=200 "'''E'''-field]] (not shown) coincide everywhere with those of the '''D'''-field, but inside the sphere, their density is lower, corresponding to the fact that the '''E'''-field is weaker inside the sphere than outside. Many of the external '''E'''-field lines terminate on the surface of the sphere, where there is a bound charge.")
VECTOR PHYSICAL QUANTITY MEASURING THE SEPARATION OF POSITIVE AND NEGATIVE ELECTRICAL CHARGES WITHIN A SYSTEM
Electric dipole; Electric Dipole Moment; Anomalous electric dipole moment; Coulomb-metre; Coulomb-meter; Separation of charge; Electrical dipole moment; Electric moment; Dipole moments of molecules
The electric dipole moment is a measure of the separation of positive and negative electrical charges within a system, that is, a measure of the system's overall polarity. The SI unit for electric dipole moment is the coulomb-meter (C⋅m).
antennule
![Olfactory receptors (scales and holes) on the antenna of the butterfly ''[[Aglais io]]'', electron micrograph](https://commons.wikimedia.org/wiki/Special:FilePath/Tykadlo.jpg?width=200 "Olfactory receptors (scales and holes) on the antenna of the butterfly ''[[Aglais io]]'', electron micrograph")
![Electron micrograph]] of antenna surface detail of a wasp ''([[Vespula vulgaris]])''](https://commons.wikimedia.org/wiki/Special:FilePath/Vespula vulgaris SEM Antenna 03.jpg?width=200 "Electron micrograph]] of antenna surface detail of a wasp ''([[Vespula vulgaris]])''")
APPENDAGES USED FOR SENSING IN ARTHROPODS
Antennule; Antennomere; Flagellomere; Antenna (Biology); Antennomeres; Antennal; Antennary; Antennation; Antenna (arthropod anatomy); Flagellomeres; Antennae (biology); Geniculate antenna; Pedicel (antenna); Antenna of insects; Antennules; Insect antenna; Antenna (anatomy); Antenna (insect); Arthropod antennae
[an't?nju:l]
¦ noun Zoology a small antenna, especially either of the first pair of antennae in a crustacean.
