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In this paper we present the microwave measurements from a backward-wave oscillator (BWO) that uses a negative index mode in a waveguide filled with a metamaterial. The metamaterial waveguide supports a mode with negative group velocity that is used to generate microwaves at 2.4 GHz by interacting with a 500 keV, 80 A electron beam. The waveguide is fabricated with complementary-split-ring-resonators...
This paper presents the experimental demonstration of a high power backward-wave oscillator (BWO) that uses a negative index mode in a waveguide filled with a metamaterial (MTM). The MTMBWO uses a 500 keV, 80 A electron beam. Initial tests of a 352 mm long metamaterial structure generated 40 W of power at 2.83 GHz. The measured frequency vs. electron beam voltage is in very good agreement with theory...
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