Compact broadband slow wave system based on spoof plasmonic THz waveguide with meander grooves

2015 ◽  
Vol 356 ◽  
pp. 336-342 ◽  
Author(s):  
Bao Jia Yang ◽  
Yong Jin Zhou
Keyword(s):  
Slow Wave ◽  
Wave System ◽  
Slow Wave System

scholarly journals Effects of dielectric discontinuity on the dispersion characteristics of the tape helix slow-wave structure with two metal shields

2012 ◽  
Vol 30 (3) ◽  
pp. 329-339 ◽  
Author(s):  
Yu Zhang ◽  
Jinliang Liu ◽  
Shiwen Wang ◽  
Xuliang Fan ◽  
Hongbo Zhang ◽  
...  
Keyword(s):  
Slow Wave ◽  
Wave Structure ◽  
Wave System ◽  
Dispersion Characteristics ◽  
Slow Wave System ◽  
Phase Velocities ◽  
Electric Length ◽  
Spatial Harmonics ◽  
Calculation Results ◽  
Relative Errors

AbstractIn the tape helix slow-wave system, discontinuous dielectrics have great effects on the dispersion characteristics. In this paper, the tape helix slow-wave system, including an inner and an outer metal shield, tape helix, nylon support, and de-ionized water as filling dielectric, was analyzed. Effects of dielectric discontinuity caused by the support dielectric and filling dielectric on the dispersion characteristics were studied in detail. The dispersion relations, phase velocities, slow-wave coefficients, and electric lengths of the spatial harmonics in the system were calculated. Results showed that, if the permittivity of support dielectric was smaller than that of the filling dielectric, frequencies of the spatial harmonics in the system rose, phase velocities and slow-wave coefficients increased, the slow-wave effect of the system was weakened so that the previous electric length was shortened. The reverse condition corresponded to the reverse results, and the electromagnetic simulation also proved it. By use of the helical pulse forming line of accelerator based on the studied tape helix slow-wave system, the electric lengths of the system were tested as 188.5 ns and 200 ns in experiments where the thicknesses of nylon support were 6 mm and 3 mm, respectively. The theoretical calculation results 198 ns and 211 ns basically corresponded to experimental results, which only had relative errors as 5 and 5.5%, respectively.

Structure Optimization of Space Helix TWT Based on Thermal Analysis

2011 ◽  
Vol 130-134 ◽  
pp. 1753-1757
Author(s):  
J.F. Ruan ◽  
J. Yang ◽  
G.Q. Lv ◽  
G.S. Deng ◽  
L. Liu
Keyword(s):  
Thermal Analysis ◽  
Slow Wave ◽  
Structure Optimization ◽  
High Heat ◽  
Electron Gun ◽  
Wave System ◽  
Traveling Wave Tube ◽  
Slow Wave System ◽  
Heat Efficiency ◽  
Main Components

The main components of a space helix TWT (traveling wave tube) are electron gun, helix slow-wave system and collector. Thermal issue is of great importance for space helix TWTs. High heat efficiency of cathode is required for electron gun, as well as high heat transmission capacity for slow-wave system and collector. Some structure optimization for the electron gun, slow-wave system and the collector of some type of space helix TWT has been proposed aiming the above purpose. To evaluate the structural optimization means, the related thermal analysis has been carried out using ANSYS software. The simulation results demonstrate that the structure optimization is effective. And the actual effect needs to be further studied.

Slow-Wave System of Double Shifted Impedance Comb

2019 ◽  
Vol 64 (2) ◽  
pp. 248-264 ◽  
Author(s):  
M. V. Davidovich
Keyword(s):  
Slow Wave ◽  
Wave System ◽  
Slow Wave System

scholarly journals Effects of dielectric discontinuity on the dispersion characteristics of the tape helix slow-wave structure with two metal shields

2011 ◽  
Vol 29 (4) ◽  
pp. 459-469 ◽  
Author(s):  
Yu Zhang ◽  
Jinliang Liu ◽  
Shiwen Wang ◽  
Xuliang Fan ◽  
Hongbo Zhang ◽  
...  
Keyword(s):  
Slow Wave ◽  
Wave Structure ◽  
Wave System ◽  
Dispersion Characteristics ◽  
Slow Wave System ◽  
Phase Velocities ◽  
Electric Length ◽  
Spatial Harmonics ◽  
Calculation Results ◽  
Relative Errors

AbstractIn the tape helix slow-wave system, discontinuous dielectrics have great effects on the dispersion characteristics. In this paper, the tape helix slow-wave system, including an inner and an outer metal shield, tape helix, nylon support and de-ionized water as filling dielectric, was analyzed. Effects of dielectric discontinuity caused by the support dielectric and filling dielectric on the dispersion characteristics were studied in detail. The dispersion relations, phase velocities, slow-wave coefficients and electric lengths of the spatial harmonics in the system were calculated. Results showed that, if the permittivity of support dielectric was smaller than that of the filling dielectric, frequencies of the spatial harmonics in the system rose, phase velocities and slow-wave coefficients increased, the slow-wave effect of the system was weakened so that the previous electric length was shortened. The reverse condition corresponded to the reverse results, and the electromagnetic simulation also proved it. By use of the helical pulse forming line of accelerator based on the studied tape helix slow-wave system, the electric lengths of the system were tested as 188.5 ns and 200 ns in experiment when the thicknesses of nylon support were 6 mm and 3 mm, respectively. The theoretical calculation results 198 ns and 211 ns basically corresponded to experimental results, which only had relative errors as 5 and 5.5%, respectively.

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