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Asymmetric-mode competition in a relativistic backward wave oscillator with a coaxial slow-wave structure

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8 Author(s)
Ge, Xingjun ; College of Optoelectronic Science and Engineering, National University of Defense Technology, Changsha 410073, People’s Republic of China ; Huihuang Zhong ; Qian, Baoliang ; Jun Zhang
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The initial experimental results of an L-band relativistic backward wave oscillator with a coaxial slow-wave structure are presented. The asymmetric-mode-competition mechanism in the device is investigated theoretically and experimentally. It is shown that the diode voltage, guiding-magnetic field, and concentricity play a key role in the suppression and excitation of the asymmetric-mode (coaxial quasi-TE11 mode). In the experiments, the asymmetric-mode with a frequency of 2.05 GHz is suppressed and excited, which is in good agreement with the theoretical results.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 24 )

Date of Publication:

Dec 2010

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