| 摘要 |
PURPOSE: A magnetron is provided to obtain improved oscillation efficiency, sufficiently lowering an unnecessary radiation and to prevent the deterioration of the oscillation efficiency. CONSTITUTION: A magnetron is characterized in that, provided that a radius of an outer periphery of a minor-diameter anode strap(49) of the magnetron is Rs1, a radius of an inner periphery of a major-diameter anode strap(51) is Rs2, a radius of an inner periphery inscribed at a tip of anode vanes(47) is Ra, and a radius of a plane part adjacent to each anode vane at the center of a magnetic pole piece is Rp; Ra, Rs1, Rs2 and Rp are set to satisfy formula (1): 1.85Ra<=(Rs1+Rs2)/2<=1.96Ra, and formula (2): Rs1<Rp<Rs2.
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