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.

scholarly journals Нелинейное подавление сигналов в лампе бегущей волны

2021 ◽  
Vol 91 (11) ◽  
pp. 1774
Author(s):  
С.В. Гришин ◽  
Б.С. Дмитриев ◽  
Ф.П. Разуваев ◽  
В.Н. Скороходов ◽  
В.Н. Титов ◽  
...  
Keyword(s):  
Traveling Wave ◽  
Short Pulse ◽  
Radio Pulse ◽  
Beam Current ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Linear Mode ◽  
First Case ◽  
Signal Suppression ◽  
Nonstationary Theory

The results of an experimental and theoretical study of the passage of monochromatic and pulse-modulated microwave signal through a traveling wave tube operating in the nonlinear suppression mode are presented. It was found that the TWT can operate either as a saturable absorber or as a power limiter and these regimes depend on the magnitude of the accelerating voltage and beam current. In the first case, the maximum signal suppression level corresponding to the Kompfner dip is realized in the linear mode, and in the second case - in the nonlinear mode, at a certain input signal power. It is shown that in the case of maximum suppression, a short pulse is formed at the front of the radio pulses. In the nonlinear Kompfner dip mode, the duration of such pulse is decreased with an increase in the power of the input radio pulse. The simulation results obtained using the nonlinear nonstationary theory of a traveling wave tube are in good qualitative agreement with the experimental data.

The Progress of Millimeter / Submillimeter Wave TWT Research

2014 ◽  
Vol 705 ◽  
pp. 219-222
Author(s):  
Hai Wei Jin ◽  
Lan Zhang ◽  
Jie Liu ◽  
Xu Qian
Keyword(s):  
Traveling Wave ◽  
Submillimeter Wave ◽  
Frequency Bandwidth ◽  
High Output Power ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Electronic Warfare ◽  
Power Frequency ◽  
Traveling Wave Tubes ◽  
High Output

Millimeter / Submillimeter wave traveling wave tubes have the merits of high output power, frequency bandwidth, compact, light weight, etc. Millimeter / Submillimeter wave traveling wave tube is an ideal millimeter / submillimeter radiation source, can be used in fields of radar, electronic warfare, communication, etc. The paper introduced and summarized the research status of foreign Millimeter / submillimeter TWT wave tube, analyzed and discussed its trend.

Sign in / Sign up

Export Citation Format

Share Document