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A clean SWS stuffing method (Hot Stuffing) has been developed for improving the heat-dissipation capability of a helix traveling-wave-tube slow-wave structure (SWS). This method has been compared with the traditional method of cold-stuffing. Special fixtures have been designed and feasibility of this method has been verified by experimental tests on SWSs using tungsten-rhenium helices and APBN support...
Electromagnetic field analysis of a helical slow-wave structure was carried out following tape-helix model incorporating the effects of space-harmonic propagating modes and the effects of finite width of the tape. Using this analysis, RF loss in the structure due to the finite conductivities of the constituent materials was estimated. The analysis was validated against published results for a segment-less...
Slow-wave characteristics of a broadband `semi-vane' helical SWS have been studied using 3D electromagnetic modeling in CST-studio. The geometry has shown promises for better broadbanding potential compared to a conventional segment loaded configuration. Also, the results have shown that placement of segments closer to the support rods provides a better negative dispersion.
In a broadband coupled-cavity slow-wave structure, the problem of bandedge oscillation is overcome by resonant loss technique by introducing lossy dielectric resonators in the cavity. To reduce the dimensions of the dielectric resonators, high lossy and high dielectric constant, materials are used. In this paper, the effects of introducing 2, 4 and 8 lossy dielectric resonators (operating either on...
Simple closed-form formulas for the estimation of the π-mode stopband and the stopband attenuation in an azimuthally asymmetric helical slow-wave structure (SWS) are developed, following the coupled-mode analysis of multiple reflections. The formulas are simple and amenable to easy computation, and also allow the use of the dispersion characteristics of the structure obtainable from any standard electromagnetic...
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