Gyrotron-traveling wave-tube circuits based on lossy ceramics

Author

Calame, Jeffrey P. ; Garven, Morag ; Danly, Bruce G. ; Levush, Baruch ; Nguyen, K.T.

Author_Institution

Naval Res. Lab., Washington, DC, USA

Volume

49

Issue

8

fYear

2002

fDate

8/1/2002 12:00:00 AM

Firstpage

1469

Lastpage

1477

Abstract

The gyro-traveling wave tube (gyro-TWT) is a microwave amplifier with simultaneous high power, high frequency, and broad bandwidth capabilities. Techniques for providing a controlled loading of the TE₀₁ cylindrical-guide operating mode of a 35 GHz gyro-TWT using monolithic, lossy ceramic structures are presented. The loading scheme, which also suppresses spurious backward-wave oscillations in the TE₁₁, TE₂₁, and TE₀₂ modes, is based on a sequence of alternating ceramic cylindrical shells and metal rings to form the electron beam tunnel. Design techniques for achieving optimal performance and methods for reducing the sensitivity to temperature-induced variations in ceramic dielectric properties are presented.

Keywords

backward wave oscillators; ceramics; dielectric-loaded waveguides; gyrotrons; millimetre wave amplifiers; travelling wave amplifiers; 35 GHz; alternating ceramic cylindrical shells; backward wave oscillators; controlled loading; cylindrical-guide operating mode; dielectric loaded waveguides; electron beam tunnel; gyrotron-traveling wave-tube circuits; interaction space design; lossy ceramics; magnetron injection gun; metal rings; microwave amplifier; monolithic ceramics; optimal performance; small-orbit spiraling beam; spurious backward-wave oscillations; temperature-induced variations; Bandwidth; Ceramics; Circuits; Dielectric losses; Electromagnetic scattering; Electron beams; Space exploration; Stability; Tellurium; Thermal conductivity;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2002.801254

Filename

1019935