A novel multi-pin rectangular waveguide slow-wave structure based backward wave amplifier at 340 GHz

doi:10.1088/1674-1056/24/7/079402

Abstract A backward wave amplifier (BWA) in a terahertz regime with a novel slow-wave structure (SWS) composed of multi parallel grating pins inside a rectangular waveguide is analyzed. The multi-pin rectangular waveguide SWS possesses good performance and is compatible with micro-fabrication technologies. The dispersion and interaction impedance of the multi-pin SWS are presented. The stopbands of the modes cling together in a Brillouim zone. The SWS has a high interaction impedance that is suitable for the interaction of multi cylindrical beams. The design, which is based on three parallel pins supporting the wave–beam interaction with four cylindrical beams, is verified by three-dimensional particle-in-cell simulations. A BWA with the central frequency at 340 GHz is demonstrated, and the output power is more than 100 mW. A tuning frequency range of 15 GHz (333–348 GHz) is obtained with a gain of more than 20 dB.

Keywords: backward wave amplifier (BWA) multi-pin structure slow-wave structure (SWS) terahertz

Received: 15 November 2014
Revised: 30 January 2015
Accepted manuscript online:

PACS:	94.05.Pt	(Wave/wave, wave/particle interactions)
	41.20.Jb	(Electromagnetic wave propagation; radiowave propagation)
	41.60.-m	(Radiation by moving charges)
	84.40.Fe	(Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.))

Fund: Project supported by the National Basic Research Program of China (Grant No. 2014CB339801) and the National High Technology Research and Development Program of China (Grant No. G060104012AA8122007B).

Corresponding Authors: Zhang Kai-Chun
E-mail: zh.kch@163.com

Cite this article:

Zhang Kai-Chun (张开春), Qi Zhong-Kuo (漆中阔), Yang Zhao-Long (杨召龙) A novel multi-pin rectangular waveguide slow-wave structure based backward wave amplifier at 340 GHz 2015 Chin. Phys. B 24 079402

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A novel multi-pin rectangular waveguide slow-wave structure based backward wave amplifier at 340 GHz

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