A Modified Slow-Wave Structure for Backward-Wave Oscillator Design in THz Band

Author

Minghao Zhang ; Yanyu Wei ; Xianbao Shi ; Lingna Yue ; Wanghe Wei ; Jin Xu ; Guoqing Zhao ; Minzhi Huang ; Zhanliang Wang ; Yubin Gong ; Wenxiang Wang ; Dazhi Li

Author_Institution

Vacuum Electron. Nat. Lab., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

4

Issue

6

fYear

2014

fDate

Nov. 2014

Firstpage

741

Lastpage

748

Abstract

In this paper, a novel slow-wave structure (SWS), called quasi-parallel-plate (QPP), is proposed for terahertz (THz) backward-wave oscillator BWO design. Compared with the conventional SWSs, the novel SWS has a wider “cold” bandwidth and higher interaction impedance. The Particle-in-cell (PIC) results show that the BWO can produce over 0.82 W output power in the operating frequency range from 0.82 to 1 THz by utilizing an operating voltage range from 5 to 10 kV. The interaction efficiency over the entire operating frequency band is above 2.8%. This SWS, which employing a circular electron beam of 3 mA, can be considered as a promising THz SWS for BWO design with characteristics of moderate operating voltage, wide tunable bandwidth, high efficiency, and compact structure.

Keywords

backward wave oscillators; slow wave structures; terahertz wave devices; THz band; circular electron beam; current 3 mA; frequency 0.82 THz to 1 THz; interaction impedance; modified slow-wave structure; particle-in-cell results; power 0.82 W; quasiparallel-plate; terahertz backward-wave oscillator BWO design; voltage 5 kV to 10 kV; Dispersion; Electron beams; Impedance; Oscillators; Rectangular waveguides; Submillimeter wave technology; Backward-wave oscillator (BWO); quasi-parallel-plate (QPP); slow-wave structure (SWS); terahertz (THz) source;

fLanguage

English

Journal_Title

Terahertz Science and Technology, IEEE Transactions on

Publisher

ieee

ISSN

2156-342X

Type

jour

DOI

10.1109/TTHZ.2014.2360778

Filename

6920092