Influence of helix parameters on the reflectance of microwave by chiral composites

1999 ◽  
Vol 41 (4) ◽  
pp. 350-353 ◽  
Author(s):  
G.C. Sun ◽  
Kai-Lun Yao ◽  
Zu-Li Liu
Keyword(s):  
Helix Parameters

Residue helix parameters obtained from dichroic analysis of peptides of defined sequence

Biochemistry ◽  
1993 ◽  
Vol 32 (27) ◽  
pp. 7048-7053 ◽  
Author(s):  
Soon Ho Park ◽  
William Shalongo ◽  
Earle Stellwagen
Keyword(s):  
Helix Parameters

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.

Sign in / Sign up

Export Citation Format

Share Document