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In a radio antenna, a passive radiator or parasitic element is a conductive element, typically a metal rod, which is not electrically connected to anything else. Multielement antennas such as the Yagi–Uda antenna typically consist of a "driven element" which is connected to the radio receiver or transmitter through a feed line, and parasitic elements, which are not. The purpose of the parasitic elements is to modify the radiation pattern of the radio waves emitted by the driven element, directing them in a beam in one direction, increasing the antenna's directivity (gain). A parasitic element does this by acting as a passive resonator, something like a guitar's sound box, absorbing the radio waves from the nearby driven element and re-radiating them again with a different phase. The waves

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  • Parasitäres Element (de)
  • Passive radiator (en)
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  • Ein parasitäres Element ist ein wirksames Element einer Antenne, das nicht wie ein aktives Element über Antennenkabel mit dem Sender oder Empfänger verbunden ist. Bei einer Yagi-Uda-Antenne sind auf dem Antennenträger neben dem aktiven Element (Dipol) typischerweise ein Reflektor und ein oder mehrere Direktoren als parasitäre Elemente angebracht. Diese sind mit dem aktiven Element lediglich über die elektromagnetischen Wellen gekoppelt und verstärken die Richtcharakteristik des Dipols in Richtung der Direktoren. Direktoren sind mechanisch kürzer und Reflektoren länger als der gespeiste Dipol. (de)
  • In a radio antenna, a passive radiator or parasitic element is a conductive element, typically a metal rod, which is not electrically connected to anything else. Multielement antennas such as the Yagi–Uda antenna typically consist of a "driven element" which is connected to the radio receiver or transmitter through a feed line, and parasitic elements, which are not. The purpose of the parasitic elements is to modify the radiation pattern of the radio waves emitted by the driven element, directing them in a beam in one direction, increasing the antenna's directivity (gain). A parasitic element does this by acting as a passive resonator, something like a guitar's sound box, absorbing the radio waves from the nearby driven element and re-radiating them again with a different phase. The waves (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/UHF_TV_Antenna_001.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Antenna_yagi_log_comparison.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Yagi-principe.png
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  • Ein parasitäres Element ist ein wirksames Element einer Antenne, das nicht wie ein aktives Element über Antennenkabel mit dem Sender oder Empfänger verbunden ist. Bei einer Yagi-Uda-Antenne sind auf dem Antennenträger neben dem aktiven Element (Dipol) typischerweise ein Reflektor und ein oder mehrere Direktoren als parasitäre Elemente angebracht. Diese sind mit dem aktiven Element lediglich über die elektromagnetischen Wellen gekoppelt und verstärken die Richtcharakteristik des Dipols in Richtung der Direktoren. Direktoren sind mechanisch kürzer und Reflektoren länger als der gespeiste Dipol. (de)
  • In a radio antenna, a passive radiator or parasitic element is a conductive element, typically a metal rod, which is not electrically connected to anything else. Multielement antennas such as the Yagi–Uda antenna typically consist of a "driven element" which is connected to the radio receiver or transmitter through a feed line, and parasitic elements, which are not. The purpose of the parasitic elements is to modify the radiation pattern of the radio waves emitted by the driven element, directing them in a beam in one direction, increasing the antenna's directivity (gain). A parasitic element does this by acting as a passive resonator, something like a guitar's sound box, absorbing the radio waves from the nearby driven element and re-radiating them again with a different phase. The waves from the different antenna elements interfere, strengthening the antenna's radiation in the desired direction, and cancelling out the waves in undesired directions. (en)
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