volume | PIER Journals

Abstract

The shaping of dispersion characteristics in a variant of discloaded circular waveguide was studied through electromagnetic analysis for assessing the structure for wideband coalescence of the beam- and waveguide-mode dispersion characteristics that entails the wideband gyrotravelling-wave tube (gyro-TWT) performance. In this variant of disc-loaded circular waveguide, the alternate disc-hole radii were varying, however, the structure was periodic. The structure periodicity coupled with Floquet's theorem and field-matching technique resulted into the dispersion relation of the infinitely long structure. A numerical code was developed to solve the dispersion relation, and the dispersion characteristics of the structure were analyzed for the azimuthally symmetric TE-modes. The effects of structure parameters were studied for getting a straight-line portion of the dispersion characteristics over a wide frequency range. The dispersion shaping was projected for typically chosen TE₀₁-mode. The results were validated against those obtained for the conventional and un-conventional known structures and those obtained using commercially available simulation tool. The variation of azimuthal electric field intensity over the radial coordinate was also studied to examine the control of structure parameter for maximaposition, where the gyrating electron beam would be positioned for optimum beam-wave interaction in a gyro-TWT.

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Dr. Vishal Kesari

Mr. Jaishanker Prasad Keshari