Title :
A microwave gyro amplifier with a ferroelectric cathode
Author :
Einat, Moshe ; Jerby, Eli ; Rosenman, Gil
Author_Institution :
Fac. of Eng., Tel Aviv Univ., Israel
fDate :
4/1/2002 12:00:00 AM
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 (εr ~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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
