Abstract
In this letter, a dual-cavity TM01 and TM02 mixed modes to TM01 mode converter is proposed for a dual-mode relativistic backward-wave oscillator (RBWO) application. This converter is more compact than the conventional converters and the TM02 mode is cutoff in the output waveguide, which forces the purity of the output TM01 mode to 100%. Especially, the converter is adjustable, and by simply replacing the waveguides in it, the converter can be well-matched to different proportional mixed modes. Electromagnetic simulation results show that the conversion efficiency of the converter is higher than 99%. The converter is validated in the high-power microwave (HPM) generation experiment of the dual-mode RBWO and a conversion efficiency of 98% is realized. A pure TM01 microwave with power of 4.6 GW and pulse duration of 42 ns at 10 GHz was obtained.
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