A Novel Slow-Wave Structure—Folded Rectangular Groove Waveguide for Millimeter-Wave TWT

Author

Tian, Yanyan ; Yue, Lingna ; Xu, Jin ; Wang, Wenxiang ; Wei, Yanyu ; Gong, Yubin ; Feng, Jinjun

Author_Institution

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

Volume

59

Issue

2

fYear

2012

Firstpage

510

Lastpage

515

Abstract

A novel slow-wave structure (SWS) called the folded rectangular groove guide, its electromagnetic characteristics, and the beam-wave interaction are presented. This structure, evolved from a conventional rectangular groove guide by bending the groove along its longitudinal direction, can operate with the sheet electron beam or the circular electron beam. From our calculations, this SWS possesses larger interaction impedance and lower ohmic loss than those of a folded rectangular waveguide with the same size. This circuit can produce output power of over 260 W with a sheet electron beam in the 3-dB bandwidth range of 88.5.5-98.5 GHz when the cathode voltage and beam current are set to 19.45 kV and 150 mA, respectively, whereas the folded rectangular waveguide can produce output power over 245 W in the 3-dB bandwidth range of 84-89 GHz.

Keywords

millimetre wave tubes; rectangular waveguides; slow wave structures; SWS; bandwidth 84 GHz to 89 GHz; bandwidth 88.5 GHz to 98.5 GHz; beam-wave interaction; circular electron beam; current 150 mA; electromagnetic characteristics; gain 3 dB; millimeter-wave TWT; power 260 W; slow-wave structure-folded rectangular groove waveguide; voltage 19.45 kV; Bandwidth; Educational institutions; Electron beams; Impedance; Power generation; Rectangular waveguides; Folded rectangular groove guide; millimeter-wave; ohmic loss; sheet electron beam; traveling-wave tube (TWT);

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2011.2175929

Filename

6096402