Third-harmonic frequency multiplication of a two-stage tapered gyrotron TWT amplifier

The frequency multiplication of a two-stage tapered gyrotron traveling wave tube amplifier is experimentally verified in low-voltage and low-current operation. By modulating an axis-encircling electron beam at the fundamental harmonic cyclotron frequency in the input stage, a frequency-tripled signa...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2005-05, Vol.52 (5), p.829-838
Main Authors: Chan-Wook Baik, Seok-Gy Jeon, Dae-Ho Kim, Sato, N., Yokoo, K., Gun-Sik Park
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Circuit properties
Cyclotron frequency
Electric, optical and optoelectronic circuits
Electron beams
Electronic circuits
Electronic tubes, masers
Electronics
Exact sciences and technology
Frequency conversion
Frequency multiplication
gyrotron
gyrotron traveling wave tube (gyro-TWT)
Gyrotrons
harmonic frequency
Microwave frequency conversion
Multiplication
Particle in cell technique
Signal convertors
Simulation
Traveling wave amplifiers
Traveling wave tubes
X-band
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Summary:The frequency multiplication of a two-stage tapered gyrotron traveling wave tube amplifier is experimentally verified in low-voltage and low-current operation. By modulating an axis-encircling electron beam at the fundamental harmonic cyclotron frequency in the input stage, a frequency-tripled signal induced by the third-harmonic component of the modulated beam current is chosen to be extracted from the output stage. Both interaction stages are linearly tapered to improve stability and bandwidth. The third-harmonic frequency multiplication is predicted theoretically and investigated using a self-consistent large-signal theory and a particle-in-cell code simulation, which estimate a pure third-harmonic generation and a power-scaling law. In the experiment, X-band drive signals from 10.6-12 GHz are multiplied by a factor of three to produce Ka-band output frequencies from 31.8-36 GHz, showing reasonable agreement with theoretical predictions for a 30-kV, 160-mA axis-encircling electron beam.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2005.845861