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A square helix slow wave structure is proposed for high gain millimeter wave TWTs. The electromagnetic characteristics of this structure are calculated by HFSS. It is shown that, compared with the equivalent circular helix with the same cross section perimeter, the square helix structure holds higher interaction impedance and lower normalized phase velocity, which indicates higher output power and...
The folded rectangular groove guide, an original slow-wave structure (SWS) , which is evolved from a conventional rectangular groove guide by bending the groove along its longitudinal direction, can operate with the sheet electron beam or the circular electron beam. The groove shape can be various,such as triangle, circle, trapezoid, etc. The electromagnetic characteristics, and the beam-wave interaction...
A novel electromagnetic structure, sine waveguide, is introduced. Its electromagnetic characteristics at terahertz range will be reported in this paper. From our calculations, this electromagnetic structure possesses quite low transmission loss compared to the rectangular waveguide. So it can be regarded as a good terahertz wave transmission line. As a periodical structure, it possesses filter characteristics,...
In this paper, the electromagnetic scattering from a conducting circular cylinder coated with an elliptic dielectric cylinder is derived rigorously by using the mode-matching technique. The effects of dielectric loss on scattering cross section are presented here by numerical techniques.
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