Second Harmonic Suppression for Broadband Helix Traveling-Wave Tubes Using the Phase Velocity Variation of Output Circuit

2016 ◽  
Vol 25 (3) ◽  
pp. 577-582
Author(s):  
Jinling Zhang ◽  
Jinsheng Yang ◽  
Hongxin Zhang
Keyword(s):  
Phase Velocity ◽  
Traveling Wave ◽  
Second Harmonic ◽  
Velocity Variation ◽  
Harmonic Suppression ◽  
Output Circuit ◽  
Traveling Wave Tubes

Second Harmonic Suppression in S-Band Traveling Wave Tube Tapers

Frequenz ◽  
2014 ◽  
Vol 69 (1-2) ◽  
pp. 11-20
Author(s):  
Elke Gehrmann ◽  
Philip Birtel ◽  
Wolfgang Dürr ◽  
Frédéric André ◽  
Arne F. Jacob
Keyword(s):  
Traveling Wave ◽  
Second Harmonic ◽  
Harmonic Suppression ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Filter Performance ◽  
Signal Suppression ◽  
Measurement Results ◽  
Traveling Wave Tubes ◽  
Helix Parameters

Abstract Traveling wave tubes (TWTs) operating at S-band are to be improved by suppressing the second harmonic frequency. Among the different possibilities, two techniques, namely harmonic injection and a filter helix for frequency selective signal suppression, are studied in more detail and applied to S-band tubes in both simulation and measurement. In addition, their suitability to improve tube performance by reducing the second harmonic is discussed. Moreover, filter helix implementation in TWTs with an arbitrary pitch profile along the interaction area is considered. In this context, the dependence of the pitch discontinuity reflection coefficient on several filter helix parameters is investigated. The influence of those parameters on the filter performance is shown by filter helix optimization. Measurement results of the optimized filter helix TWT are presented.

Origin of Second-Harmonic Signals in Octave Bandwidth Traveling-Wave Tubes

2018 ◽  
Vol 65 (2) ◽  
pp. 710-715 ◽  
Author(s):  
Patrick Y. Wong ◽  
Y. Y. Lau ◽  
David Chernin ◽  
Brad W. Hoff ◽  
Ronald M. Gilgenbach
Keyword(s):  
Traveling Wave ◽  
Second Harmonic ◽  
Harmonic Signals ◽  
Traveling Wave Tubes

Efficiency Improvement of Broadband Helix Traveling Wave Tubes Using Hybrid Phase Velocity Tapering Model

2008 ◽  
Vol 22 (7) ◽  
pp. 1013-1023 ◽  
Author(s):  
Z. Y. Duan ◽  
Y. B. Gong ◽  
Y. Y. Wei ◽  
W. X. Wang ◽  
B.-I. Wu ◽  
...  
Keyword(s):  
Phase Velocity ◽  
Traveling Wave ◽  
Efficiency Improvement ◽  
Traveling Wave Tubes

Positive phase-velocity tapering of broadband helix traveling-wave tubes for efficiency enhancement

2002 ◽  
Vol 80 (16) ◽  
pp. 3000-3002 ◽  
Author(s):  
Sun-Shin Jung ◽  
Andrei V. Soukhov ◽  
Baofu Jia ◽  
Gun-Sik Park
Keyword(s):  
Phase Velocity ◽  
Traveling Wave ◽  
Positive Phase ◽  
Efficiency Enhancement ◽  
Traveling Wave Tubes

Filter Helix for Harmonic Suppression in Traveling Wave Tubes

2014 ◽  
Vol 61 (6) ◽  
pp. 1859-1864 ◽  
Author(s):  
Elke Gehrmann ◽  
Philip Birtel ◽  
Wolfgang Durr ◽  
Arne F. Jacob
Keyword(s):  
Traveling Wave ◽  
Harmonic Suppression ◽  
Traveling Wave Tubes
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