Abstract
Frequency agility is necessary for many applications of high-power microwave sources. To expand the frequency-tuning bandwidth of the backward-wave oscillator (BWO) with an extracting cavity while holding high efficiency and less amplitude fluctuation, a dual-mechanical tuning method by changing the drift length and the cavity length in synchronism is investigated in this paper. A bandwidth of about 750 MHz around 9.6 GHz with power efficiency of over 33% and amplitude fluctuation of about -1 dB is obtained. The total adjusted length is 24 mm. The simulation results demonstrated the frequency-tuning ability of the relativistic BWO with multigigawatt output power.
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