Interaction Impedance of a Practical Helix Slow-Wave Structure using Tape Helix Model

1999 ◽  
Vol 45 (2) ◽  
pp. 87-96
Author(s):  
R K Gupta ◽  
A K Sinha ◽  
S N Joshi
Keyword(s):  
Slow Wave ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Interaction Impedance

U-shaped meander-line slow-wave structure with stub-loading

2017 ◽  
Vol 31 (16) ◽  
pp. 1750173 ◽  
Author(s):  
Xingwang Bian ◽  
Min Miao ◽  
Zhensong Li ◽  
Xiaole Cui
Keyword(s):  
Millimeter Wave ◽  
Slow Wave ◽  
Traveling Wave ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Traveling Wave Tube ◽  
Wave Tube ◽  
Lower Phase ◽  
Interaction Impedance ◽  
Meander Line

In this paper, a U-shaped meander-line slow-wave structure (SWS) with stub-loading is proposed for applications in Ka-band traveling-wave tube (TWT). This new slow-wave structure, loaded with a stub at the center of the U-turn section, has higher interaction impedance and lower phase velocity compared with conventional U-shaped meander-line SWSs, indicating that the devices based on this structure may have a lower operating voltage and higher output power. The dispersion characteristic, interaction impedance, transmission characteristics, and beam-wave interaction are simulated by utilizing simulation tool. The simulation result predicts that the millimeter-wave traveling-wave tube design based on this slow-wave structure is capable of delivering over 200 W with a gain of 33 dB and interaction efficiency 14.5% at the center frequency 34 GHz. This design, more compact and powerful in comparison with those based on more conventional vacuum electronic mechanisms, is demonstrated as a prospective option for integrated millimeter-wave power modules (MMPMs) empowering a broad spectrum of fields, from target detection, to imaging and telecommunications, among others.

scholarly journals On the new prospects of high power wideband TWT creation

2019 ◽  
Vol 30 ◽  
pp. 02003
Author(s):  
Evgeniia Bogomolova ◽  
Anatoly Galdetskiy ◽  
Irina Natura
Keyword(s):  
Electron Beam ◽  
Slow Wave ◽  
High Power ◽  
Special Form ◽  
Wave Structure ◽  
Slow Wave Structure ◽  
Dispersion Correction ◽  
Magnet System ◽  
Interaction Impedance ◽  
X Band

A new design of a slow - wave structure of a “crossed staircase” type for a powerful broadband multi-beam X-band TWT has been considered. The use of dense packing of beams and diaphragms with bushings allows to increase the interaction impedance to 4-7 Ohm and the dispersion correction makes it possible to expand the band up to 18% using a special form of coupling slots. The calculation of electronics demonstrates a possibility of obtaining the power of 24 kW, gain of 17 dB and efficiency of 28% in the TWT with such a slow-wave structure. The design of the permanent magnet system with an interpole gap of 119 mm was developed which provides 100% transportation of the electron beam to the collector.

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