Title :
Performance of a wideband, three-stage, mixed geometry gyrotwystron amplifier
Author :
Malouf, Perry M. ; Granatstein, Victor L. ; Park, S.Y. ; Gun-Sik Park ; Armstrong, Carter M.
Author_Institution :
Omega-P Inc., New Haven, CT, USA
fDate :
9/1/1995 12:00:00 AM
Abstract :
A three-stage, mixed geometry gyrotwystron amplifier has recently been operated and characterized at 4.5 GHz. Gyrotwystrons are hybrids of the gyroklystron and gyro-traveling-wave tube (gyro-TWT) amplifiers. In the device which was studied, the first two stages were tunable rectangular resonator cavities, and the third (output) stage was a circular cylindrical waveguide traveling wave section. All three stages operate in fundamental mode, and are separated by cut-off drift regions. This experiment was conceived as an extension of a previous three-cavity gyroklystron experiment, the motivation being to improve upon the gyroklystron instantaneous bandwidth of 0.4% while not sacrificing efficiency or gain. Measurements of gyrotwystron performance showed a 1.5% instantaneous bandwidth, a fourfold increase over that of the gyroklystron. The gain-bandwidth product of the gyrotwystron exceeded that of the gyroklystron by a factor of 6
Keywords :
gyrotrons; klystrons; microwave amplifiers; travelling wave amplifiers; wideband amplifiers; 4.5 GHz; circular cylindrical waveguide; cut-off drift regions; efficiency; fundamental mode; gain-bandwidth product; gyro-traveling-wave tube; gyroklystron; instantaneous bandwidth; tunable rectangular resonator cavities; wideband three-stage mixed geometry gyrotwystron amplifier; Bandwidth; Broadband amplifiers; Dielectric breakdown; Electron beams; Geometry; Klystrons; Periodic structures; Radio frequency; Rectangular waveguides; Resonance;
Journal_Title :
Electron Devices, IEEE Transactions on
