scholarly journals Comparative study of envelope models for hybrid time- and frequency-domain simulation of traveling-wave tubes

2018 ◽  
Vol 10 (5-6) ◽  
pp. 521-529
Author(s):  
Djamschid Safi ◽  
Philip Birtel ◽  
Sascha Meyne ◽  
Arne F. Jacob
Keyword(s):  
Frequency Domain ◽  
Traveling Wave ◽  
Phase Transfer ◽  
Hybrid Approach ◽  
Traveling Wave Tube ◽  
Transfer Factors ◽  
Frequency Independent ◽  
Tone Signal ◽  
Traveling Wave Tubes ◽  
Selection Of

A selection of hybrid frequency- and time-domain approaches is evaluated with respect to their suitability for predicting the multi-tone behavior of a reference Ku-band helix traveling-wave tube. For this, a frequency-domain code is extended by a selection of frequency-dependent and frequency-independent envelope models and compared to a number of simulated and measured responses to two-tone signal excitation with varying frequency spacing. The selected envelope methods are investigated both in the hybrid approach and based on measured TWT characteristics. Output levels and classical multi-tone metrics, such as intermodulation products and phase transfer factors, are considered. By reducing a modulation scenario to a number of significant sequences, a comparison to full physics-based frequency-domain simulation is presented to show the potential of the proposed approach.

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.

scholarly journals Calculations of three-dimensional frequency-domain nonlinear beam-wave reaction for helix traveling wave tubes

2009 ◽  
Vol 58 (5) ◽  
pp. 3118
Author(s):  
Hao Bao-Liang ◽  
Xiao Liu ◽  
Liu Pu-Kun ◽  
Li Guo-Chao ◽  
Jiang Yong ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Traveling Wave ◽  
Three Dimensional ◽  
Nonlinear Beam ◽  
Beam Wave ◽  
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.

A 2.5-D frequency-domain nonlinear computer model of coupled-cavity traveling wave tubes

2014 ◽  
Vol 33 (5) ◽  
pp. 1777-1793 ◽  
Author(s):  
Chun-Jiang Bai ◽  
Jian-Qing Li ◽  
Yu-Lu Hu
Keyword(s):  
Frequency Domain ◽  
Equivalent Circuit ◽  
Computer Model ◽  
Traveling Wave ◽  
Nonlinear Problems ◽  
Electron Trajectory ◽  
Disk Model ◽  
Content Type ◽  
Traveling Wave Tubes ◽  
Coupled Cavity

Purpose – The purpose of this paper is to present a 2.5-dimensional (2.5-D) frequency-domain nonlinear computer model for the beam-wave interaction of coupled-cavity traveling wave tubes (CC-TWTs). Design/methodology/approach – MKK (proposed by Malykhin, Konnov, and Komarov) equivalent circuit model is used to describe the coupled-cavity slow-wave structure. And the losses are taken into account in the MKK equivalent circuit. Instead of one-dimensional (1-D) disk model, the electron beam is divided into a set of discrete rays and the electron dynamics are treated using the three-dimensional (3-D) Lorentz force equations. Findings – The simulated result obtained show that the computer model can give a good predict for CC-TWTs in V-band. Practical implications – The computer model is capable of treating nonlinear problems. Compared with particle-in-cell simulation, the 2.5-D frequency-domain computer model spends less time. Besides, the 3-D electron trajectory can be used to design high-efficiency collectors for CC-TWTs. Originality/value – The computer model is able to simulate nonlinear problems of coupled-cavity TWT faster.

Application of Multi-Beam Technique in Microwave Tubes

2012 ◽  
Vol 155-156 ◽  
pp. 784-788
Author(s):  
Ze Lun Li ◽  
Zhi Cheng Huang ◽  
You Jun Huang
Keyword(s):  
Traveling Wave ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Dispersion Characteristics ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Coupling Impedance ◽  
Impedance Characteristics ◽  
Traveling Wave Tubes ◽  
Beam Technique

The applications of multi-beam technique in microwave tubes including klystrons and traveling wave tubes have been analyzed. A type of 5-beam traveling wave tube slow-wave structure was designed, and dispersion characteristics and coupling impedance characteristics were simulated. According to the simulated results, it can be concluded that dispersion of multi-beam traveling wave tube is satisfactory and the coupling impedance is high, and multi-beam technique can be widely used in microwave tubes because it can improve the plus and output power of microwave tubes.

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