A microwave gyro amplifier with a ferroelectric cathode

Author

Einat, Moshe ; Jerby, Eli ; Rosenman, Gil

Author_Institution

Fac. of Eng., Tel Aviv Univ., Israel

Volume

50

Issue

4

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

1227

Lastpage

1230

Abstract

A ferroelectric cathode is employed for the first time as the electron-beam source in a microwave amplifier tube. A PLZT 12/65/35 ferroelectric ceramic with a high dielectric constant (ε_r~4000) is used in a form of a hollow cathode. The tube is operated in poor vacuum conditions (2×10^-5 Torr) at room temperature, in a mechanism of a cyclotron-resonance maser amplifier. The device operates near the waveguide cutoff frequency at 6927 MHz. A 22-dB electronic gain and a 25-W output power are measured in this experiment

Keywords

cathodes; cyclotron masers; ferroelectric ceramics; ferroelectric devices; gyrotrons; lanthanum compounds; lead compounds; microwave amplifiers; microwave tubes; permittivity; 2×10^-5 torr; 22 dB; 25 W; 6927 MHz; PLZT; PLZT ferroelectric ceramic; PbLaZrO3TiO3; cyclotron resonance maser amplifier; dielectric constant; electron beam source; electronic gain; ferroelectric cathode; hollow cathode; microwave gyro amplifier tube; output power; waveguide cutoff frequency; Cathodes; Ceramics; Cutoff frequency; Electron tubes; Ferroelectric materials; High-K gate dielectrics; Masers; Microwave amplifiers; Power generation; Temperature;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.993430

Filename

993430