| 摘要 |
A magnetron oscillator having the normally provided cavities of a magnetron oscillator, has a further resonant cavity coupled to one of the normally provided cavities by an inductive loop. The further cavity is provided with two electrodes facing one another, the opposing faces being coated with a secondary electron emissive material. The two electrodes are spaced apart such that an electron released from one surface takes a time equal to half a cycle of the R.F. voltage developed between the two electrodes to cross the gap to the other electrode thereby producing a multipactor discharge between the two electrodes. While multipactor discharging occurs the further cavity is effectively short circuited so that the magnetron frequency of oscillation is the resonant frequency of its anode cathode resonator. The multipactor discharge is stopped by application of a D.C. voltage to the two electrodes so that the further cavity pulls the magnetron frequency.
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