| 摘要 |
In a magnetron of the class comprising an anode cylinder, radial vanes mounted on the inner surface of the anode cylinder, and a cathode structure disposed along the axis of the anode cylinder, non-magnetic annular rings, frustums or cylinders are mounted on the pole pieces of the permanent magnets or on the inner surface of the anode cylinder to cause the end spaces on both ends of the anode cylinder to resonate at the second higher harmonic which is desired to be suppressed.
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