A Lossy Dielectric-Ring Loaded Waveguide With Suppressed Periodicity for Gyro-TWTs Applications

A dielectric-loaded (DL) waveguide is an attractive possibility for interaction circuits with high-power sources in the millimeter-wave regime down to tenths of millimeters, particularly for gyrotron-traveling-wave-tube amplifiers (gyro-TWTs). We present results on a systematic investigation of the...

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Bibliographic Details
Published in:IEEE transactions on electron devices 2009-10, Vol.56 (10), p.2335-2342
Main Authors: DU, Chao-Hai, LIU, Pu-Kun
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Attenuation
Circuit properties
Circuits
Data mining
Devices
Dielectric losses
Dielectrics
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronic tubes, masers
Electronics
Exact sciences and technology
Gyrotron-traveling-wave-tube amplifier (gyro-TWT)
Harmonic analysis
Harmonics
lossy dielectric
modal transition
Oscillations
Phase velocity
Wave propagation
Waveguide components
Waveguides
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Summary:A dielectric-loaded (DL) waveguide is an attractive possibility for interaction circuits with high-power sources in the millimeter-wave regime down to tenths of millimeters, particularly for gyrotron-traveling-wave-tube amplifiers (gyro-TWTs). We present results on a systematic investigation of the influence of the periodically loaded lossy dielectric on the propagation characteristics of the operating modes, which reveals that a complex mode in the periodic system can be mapped to a corresponding mode in an empty waveguide or a uniform DL waveguide. Dielectric losses not only induce modal transitions between different modes with similar field structures and close phase velocities in the uniform system but also unify the discrete mode spectrum into a continuous spectrum in the periodic system. Since the lossy dielectric functions as a power sink, the higher order Bloch harmonic components arising from the structural periodicity are suppressed, and the mode spectrum of the lossy periodic system degenerates into that of an empty waveguide. This alleviates the potential danger of spurious oscillations induced by the higher order harmonic components, making the periodic lossy DL waveguide promising in a high-power millimeter-wave gyro-TWT.
ISSN:0018-9383
1557-9646
DOI:10.1109/TED.2009.2028384