a metal cylinder inside a strong magnetic field
a thermionic vacuum tube which is constructed with a permanent magnet forming a part of the tube and which generates microwave power
A high power electron tube used as an oscillator at microwave frequencies.
The physical component of a microwave system that generates the microwaves.
device that comprises an electric circuit within a strong but variable magnetic field. Electrons are produced at the cathode and are caused to spin in the magnetic field. The effect of their spin is the creation of short-wave radiation. The magnetron is installed within a cavity, which can be set to resonate at the frequency of the radiation being produced by the electrons. The oscillator transmits this as a signal.
A vacuum tube surrounded by a magnet that generates microwave energy. Used in radar sets and microwave ovens.
A diode vacuum tube in which the flow of electrons is controlled by an externally applied magnetic field to generate power at microwave frequencies; the active element of a microwave oven.
A self-excited oscillator used as a radar transmitter tube. Magnetrons are characterized by high peak power, small size, efficient operation, and low operating voltage. Emitted electrons interact with an electric field and a strong magnetic field to generate microwave energy. Because the direction of the electric field that accelerates the electron beam is perpendicular to the axis of the magnetic field, magnetrons are sometimes referred to as crossed-field tubes. Unlike a klystron, a magnetron is not a coherent transmission source, but has a randomly changing phase from pulse to pulse. A coaxial magnetron uses a different architecture and has better stability, higher reliability, and longer life. Magnetrons are used in inexpensive radars and microwave ovens. Compare klystron.
