Circular-waveguide slow-wave structure for angularly loading spiral line

Abstract

The invention relates to a circular-waveguide slow-wave structure for angularly loading spiral lines, which belongs to the technical field of vacuum electrons and comprises a circular waveguide, N identical spiral lines and two circular-ring medium sheets, wherein the radius of the circular waveguide is R1, the outer radii of the two circular-ring medium sheets are R1, and the inner radii of the two circular-ring medium sheets are R5; the two circular-ring medium sheets are respectively fixed on the two end surfaces of the circular waveguide, and the N identical spiral lines are all connected between the two circular-ring medium sheets, so that the N identical spiral lines are angularly and uniformly distributed inside the circular waveguide; and the hollow parts of the two circular-ring medium sheets and a space part surrounded by all the spiral lines together form an electron-beam passage. The circular-waveguide slow-wave structure can work at short millimeter-wave and terahertz-wave bands, the coupling impedance can be effectively improved, and a dispersion curve is more flat, so that a traveling-wave tube adopting the novel slow-wave structure has higher gain and interaction efficiency, and the larger output power is obtained; and in addition, the phase velocity can be greatly decreased in the invention, accordingly a lower working voltage can be adopted, and the circular-waveguide slow-wave structure is favorable to the miniaturization of devices.

Description

technical field [0001] The invention belongs to the technical field of vacuum electronics and relates to a traveling wave tube amplifier. Background technique [0002] Traveling wave tube is the most important type of microwave source in the field of vacuum electronics technology. It has the characteristics of high power, high efficiency, high gain, broadband and long life. It is widely used in radar, guidance, satellite communication, microwave remote sensing, and radiation measurement. And other fields, its performance directly determines the level of equipment. The core component of a traveling wave tube is a slow wave structure. [0003] With the rapid development of modern electronic technology, my country's aerospace engineering and new generation satellites urgently need a large number of millimeter wave sources with broadband, high efficiency, light weight and small size. However, as the operating frequency increases, especially in the short millimeter wave band or...

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Problems solved by technology

[0005] However, because the relative permittivity ε of the medium r It is limited, and its slow wave ratio cannot be very large. According to the law of energy conservation, the operating voltage of the device is proportional to the phase velocity. Therefore, when the phase velocity is too large, the operating voltage of the device will be too large, which is very unfavorable for the miniaturization of equipment.

In addition, if a material with a large dielectric constant is selected, the coupling impedance will also be severely reduced, resulting in a decrease in the power and gain of the entire tube

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