A diode-type vacuum tube in which the flow of electrons is controlled by a magnetic field external to the tube. A magnetron is used to produce high-power electromagnetic energy in the frequency range of 1 to 40 GHz. Magnetron tubes find application in radars. Most magnetrons have a central cathode and a surrounding plate. This plate is usually divided into two or more sections by radial barriers called cavities. The RF (radio frequency) output is taken from a wave-guide opening into the anode. The cathode is connected to the negative terminal of a high-voltage source, while the anode is connected to the positive terminal. The electrons start flowing from the cathode to the anode. Application of the magnetic field in a longitudinal direction causes the electrons to travel outward in a spiral instead of along a straight path. The electrons travel in bunches because of the interaction between the electric and magnetic fields, and this results in oscillations, with the frequency being somewhat stabilized by the cavities. Magnetrons can produce continuous power outputs of more than 1 kW at a frequency of 1 GHz. The output drops as the frequency increases. For example, at 10 GHz, a magnetron can produce about 10 to 20 watts of continuous radio frequency output. For pulse modulation, the peak-power values are much higher.
The magnetron produces oscillation because of the influence of a magnetic field on motion of electrons.

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  • Magnetron — Magnétron Magnétron Magnétron …   Wikipédia en Français

  • Magnétron — Magnétron …   Wikipédia en Français

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  • magnétron — [ maɲetrɔ̃ ] n. m. • 1921; de magné(to ) et (cyclo)tron ♦ Électron. Tube électronique à vide du type diode, soumis à un champ d induction magnétique et utilisé comme oscillateur et amplificateur de puissance en hyperfréquence. ● magnétron nom… …   Encyclopédie Universelle

  • magnetron — mag ne*tron, n. a diode vacuum tube in which the flow of electrons from a central cathode to a cylindrical anode is controlled by crossed magnetic and electric fields; used mainly in microwave oscillators. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • magnetrón — Fuente de energía de microondas utilizada en los aceleradores lineales de uso médico para acelerar los electrones hasta energías terapéuticas. Diccionario Mosby Medicina, Enfermería y Ciencias de la Salud, Ediciones Hancourt, S.A. 1999 …   Diccionario médico

  • magnétron — s. m. [Eletrônica] Válvula eletrónica , usada para gerar ondas eletromagnética muito curtas. • [Brasil] Plural: magnétrones ou magnétrons.   ‣ Etimologia: magnete + [ele]trão   ♦ Grafia em Portugal: magnetrão …   Dicionário da Língua Portuguesa

  • magnetron — mȁgnetrōn m <G magnetróna> DEFINICIJA fiz. elektronska cijev koja proizvodi visoko frekventne mikrovalne oscilacije, koristi se kao izvor signala kod radara ETIMOLOGIJA magnet + v. {{(elekt)ron>> …   Hrvatski jezični portal

  • magnetrón — m. Electr. Tubo electrónico de forma cilíndrica en el que los electrones producidos por un cátodo caliente en el eje son acelerados por un campo eléctrico radial y a la vez sometidos a la acción de un campo magnético axial, generándose microondas …   Diccionario de la lengua española

  • magnetron — [mag′nə trän΄] n. [ MAGNE(T) + (ELEC)TRON] an electron tube in which the flow of electrons from the cathode to one or more anodes is controlled by an externally applied magnetic field: used to generate alternating currents at microwave… …   English World dictionary

  • Magnetron — Das Magnetron ist eine Vakuum Laufzeitröhre zur Erzeugung von elektromagnetischer Strahlung im Mikrowellenbereich (ca. 0,3 bis 300 GHz). Magnetrone haben einen Wirkungsgrad von bis zu 80 % und sind somit sehr effiziente, preiswerte… …   Deutsch Wikipedia

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