Recent advances in metamaterial klystrons
University of Electronic Science and Technology of China, Chengdu 610054, PR China
2 School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, PR China
3 Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, PR China
4 College of Advanced Interdisciplinary Studies, National University of Defence Technology, Changsha 410073, PR China
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Accepted: 1 January 2021
Published online: 10 February 2021
As a kind of artificially structured media, electromagnetic metamaterials (MTMs) have exotic electromagnetic properties that are not found or difficult to achieve in natural materials. This class of metal/dielectric-structured artificial media has attracted great attention during the past two decades and made important breakthroughs. A variety of passive and active devices based on MTMs have been developed rapidly. Especially MTM klystrons, which show very remarkable advantages, including miniaturization, high gain, and high efficiency in the microwave band. MTM extended interaction klystrons creatively combine the advantages of MTMs, extended interaction technology, and klystrons. It provides a new design idea for the development of brand-new klystrons with high performance. In this review paper, we report the recent advances in MTM klystrons including MTM extended interaction oscillator and MTM extended interaction klystron amplifier. Furthermore, the prospects and challenges of MTM klystrons are discussed. Finally, the development trend is concluded.
Key words: Metamaterial / klystron / miniaturization / high power / high efficiency
© X. Wang et al., published by EDP Sciences, 2021
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