Design of Helix Pitch Profile for Broadband Traveling-Wave Tubes

To improve the performance of a broadband traveling-wave tube (TWT), a helix pitch profile incorporating a section with reduced phase velocity followed by a positive phase-velocity taper is used. A simple technique to design a pitch profile of this kind is elaborated upon and later applied to an exi...

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Veröffentlicht in:	IEEE transactions on electron devices 2009-05, Vol.56 (5), p.1135-1140
Hauptverfasser:	Ghosh, T.K., Challis, A.J., Jacob, A., Bowler, D.
Format:	Artikel
Sprache:	eng
Schlagworte:	Amplifiers Applied sciences Broadband Broadband amplifiers Broadband communication Circuit properties Data mining Devices Electric, optical and optoelectronic circuits Electron tubes Electronic circuits Electronic tubes, masers Electronics Exact sciences and technology Gain Harmonic analysis helix taper Noise levels Optimization Performance enhancement Phase velocity phase-velocity tapering pitch optimization Power generation Traveling wave tubes traveling-wave tube (TWT) Tubes (electronic)
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Beschreibung
Zusammenfassung:	To improve the performance of a broadband traveling-wave tube (TWT), a helix pitch profile incorporating a section with reduced phase velocity followed by a positive phase-velocity taper is used. A simple technique to design a pitch profile of this kind is elaborated upon and later applied to an existing 6-18-GHz uniform pitch mini-TWT to improve its interaction efficiency. By using the newly designed helix, a TWT is developed, which shows increases in electronic efficiency and output power up to 8.75% points and 2.6 dB (75 W), respectively. Further application of this method to another uniform pitch baseline tube results in similar improvements.
ISSN:	0018-9383 1557-9646
DOI:	10.1109/TED.2009.2015137