| 摘要 |
A magnetron comprises an anode, a cathode disposed at a center of the anode, a plurality of vanes radially protruding from an inner surface of the anode towards the cathode, and an upper end shield and a lower end shield respectively coupled to an upper end and a lower end of the cathode so that a length of an effective heating portion of the cathode may be less than a height of the vane. A heating power for the cathode is reduced thus to decrease an input power for the same output, thereby enhancing an efficiency of the magnetron.
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