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Second harmonic suppression in S-band traveling wave tube tapers
Publikationstyp
Journal Article
Publikationsdatum
2015-01-29
Sprache
English
Institut
TORE-URI
Enthalten in
Volume
69
Issue
1-2
Start Page
11
End Page
20
Citation
Frequenz 1-2 (69): 11-20 (2015-01-29)
Publisher DOI
Scopus ID
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.
Schlagworte
filter helix
harmonic injection
helix delay line
second harmonic
TWT