A microwave gyro amplifier with a ferroelectric cathode

Moshe Einat, Eli Jerby*, Gil Rosenman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


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.

Original languageEnglish
Pages (from-to)1227-1230
Number of pages4
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number4
StatePublished - Apr 2002


  • Cold-cathode tubes
  • Electron emission
  • Electron guns
  • Ferroelectric materials
  • Gyrotrons


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