Large-signal field analysis of a linear beam travelling wave tube amplifier for the anisotropically conducting tape helix slow-wave structure supported by dielectric rods

Stanislaus, Richards Joe; Gnanamoorthi, Naveen Babu

doi:10.1080/09205071.2017.1394916

Cited by 13 publications

(1 citation statement)

References 23 publications

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“…surface current density in a perfectly conducting model is negligible and often ignored. The cold test models reported with anisotropic tape material conductivity and dielectric rod support structures were extended to perform a large-signal field analysis in [10].…”

Section: Introductionmentioning

confidence: 99%

Dispersion Analysis of a Planar Rectangular Tape Helix Slow Wave Structures Supported by Dielectric Rods

Babu,

Chauhan

2023

PIER M

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The dispersion equation for a rectangular tape helix with four rectangular dielectric support rods was derived using precise boundary conditions and field-restricting functions. The dispersion equation is a simplified conjoint expression obtained for the axial and transverse directions, derived by solving an infinite set of linear homogeneous simultaneous equations, represented as an infinite-order matrix whose determinant is zero. The dispersion characteristics plotted from the simplified dispersion equation consist of dominant and additional higher-order modes, similar to an open rectangular slow-wave structure (SWS), but with the existence of β0a(k0a) roots everywhere without the limitations of the forbidden region boundary. The phase velocity curves obtained for the corresponding mode of the dispersion characteristics exhibit comparable behavior to the free-space rectangular helix SWS, especially in the third "allowed" region, which offers a wider beam-wave interaction region with phase speed equivalent to the speed of light at higher operating frequencies. The numerically computed dispersion curves and their corresponding phase velocities were plotted. Similar dimensional variations of the structure with discrete support rods were simulated using three-dimensional simulation software. The dispersion characteristics obtained from the simplified dispersion equation along with the dimensional variation of the dielectric-loaded rectangular tape helix SWS determine the capability and limitations of such minuscule traveling wave tubes (TWTs) as planar TWTs suitable for fabrication using micro-machining techniques.

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Section: Introductionmentioning

confidence: 99%