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What (who) is Yagi–Uda antenna - definition
Yagi–Uda antenna
![Close-up of Yagi arrays of the [[ASV Mark II radar]] fitted beneath a [[Bristol Beaufort]] aircraft for [[anti-submarine warfare]].](https://commons.wikimedia.org/wiki/Special:FilePath/ASV Mk II radar transmitter antenna on Bristol Beaufort.jpg?width=200 "Close-up of Yagi arrays of the [[ASV Mark II radar]] fitted beneath a [[Bristol Beaufort]] aircraft for [[anti-submarine warfare]].")
![Bf 110]] night fighter aircraft.](https://commons.wikimedia.org/wiki/Special:FilePath/FuG 220 and FuG 202 radar of Me 110 1945.jpg?width=200 "Bf 110]] night fighter aircraft.")
![A three-element Yagi–Uda antenna used for long-distance ([[skywave]]) communication in the [[shortwave]] bands by an [[amateur radio]] station. The longer ''reflector'' element (''left''), the [[driven element]] (''centre''), and the shorter ''director'' (''right'') each have a so-called ''trap'' (parallel [[LC circuit]]) inserted along their conductors on each side, allowing the antenna to be used on more than one frequency band.](https://commons.wikimedia.org/wiki/Special:FilePath/Montreal-tower-top.thumb2.jpg?width=200 "A three-element Yagi–Uda antenna used for long-distance ([[skywave]]) communication in the [[shortwave]] bands by an [[amateur radio]] station. The longer ''reflector'' element (''left''), the [[driven element]] (''centre''), and the shorter ''director'' (''right'') each have a so-called ''trap'' (parallel [[LC circuit]]) inserted along their conductors on each side, allowing the antenna to be used on more than one frequency band.")
![A [[Nakajima J1N]]1-S night fighter with quadruple Yagi radar transceiver antennas](https://commons.wikimedia.org/wiki/Special:FilePath/Nakajima J1N1-S Gekko land based night fighter at the Steven F. Udvar-Hazy Center.jpg?width=200 "A [[Nakajima J1N]]1-S night fighter with quadruple Yagi radar transceiver antennas")
![corner reflector]].](https://commons.wikimedia.org/wiki/Special:FilePath/UHF TV Antenna 001.JPG?width=200 "corner reflector]].")
![director]] (''right''). Exact spacings and element lengths vary somewhat according to specific designs.](https://commons.wikimedia.org/wiki/Special:FilePath/Yagi 3 element.svg?width=200 "director]] (''right''). Exact spacings and element lengths vary somewhat according to specific designs.")
![How the antenna works. The radio waves from each element are emitted with a phase delay, so that the individual waves emitted in the forward direction ''(up)'' are in phase, while the waves in the reverse direction are out of phase. Therefore, the forward waves add together, ([[constructive interference]]) enhancing the power in that direction, while the backward waves partially cancel each other ([[destructive interference]]), thereby reducing the power emitted in that direction.](https://commons.wikimedia.org/wiki/Special:FilePath/Yagi antenna animation 16 frame 1.6s.gif?width=200 "How the antenna works. The radio waves from each element are emitted with a phase delay, so that the individual waves emitted in the forward direction ''(up)'' are in phase, while the waves in the reverse direction are out of phase. Therefore, the forward waves add together, ([[constructive interference]]) enhancing the power in that direction, while the backward waves partially cancel each other ([[destructive interference]]), thereby reducing the power emitted in that direction.")
TYPE OF RADIO ANTENNA
Yagi-Uda Antenna; Yagi Antenna; Yagi Aerial; Yagi-Uda; Uda-Yagi; Yagis; Yagi array; Yagi antenna; Yagi-uda antenna; Yagi-Uda antenna
A Yagi–Uda antenna or simply Yagi antenna, is a directional antenna consisting of two or more parallel resonant antenna elements in an end-fire array; these elements are most often metal rods acting as half-wave dipoles. Yagi–Uda antennas consist of a single driven element connected to a radio transmitter and/or receiver through a transmission line, and additional "passive radiators" with no electrical connection, usually including one so-called reflector and any number of directors.
Yagi antenna
TYPE OF RADIO ANTENNA
Yagi-Uda Antenna; Yagi Antenna; Yagi Aerial; Yagi-Uda; Uda-Yagi; Yagis; Yagi array; Yagi antenna; Yagi-uda antenna; Yagi-Uda antenna
['j?:gi]
¦ noun a highly directional narrowband radio aerial made of several short rods mounted across an insulating support.
Origin
1940s: named after the Japanese engineer Hidetsugu Yagi.
Typhoon Yagi
WIKIMEDIA DISAMBIGUATION PAGE
Typhoon Yagi (disambiguation); List of tropical storms named Yagi; Tropical Storm Yagi; List of storms named Yagi
The name Yagi has been used to name four tropical cyclones in the northwestern Pacific Ocean. The name was submitted by Japan and is the Japanese word for goat or the Japanese name of the constellation Capricornus.
