Title :
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
fDate :
8/1/2002 12:00:00 AM
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;
Journal_Title :
Electron Devices, IEEE Transactions on
DOI :
10.1109/TED.2002.801254
