A frame-rod slow wave structure

Abstract

The invention provides a frame-pole slow-wave structure, belonging to the technical field of microwave vacuum devices. The structure comprises a rectangular cylindrical waveguide body (1), a rectangular cylindrical insulating dielectric substrate (2) arranged in the rectangular cylindrical waveguide body (1), a frame-pole metal slow-wave circuit (3) arranged at the surface of the rectangular cylindrical insulating dielectric substrate (2) and a center vacuum interaction region (4) enclosed in the frame-pole slow-wave circuit. The structure is characterized in that the frame-pole metal slow-wave circuit (3) is formed by connection rods among multiple metal wire frames and metal frames with the same shape and size, and the adjacent connection rods are alternately on the center connection line of a metal wire frame top side or bottom side. According to the frame-pole slow-wave structure, an existing rectangular spiral line is deformed to be the frame-pole slow-wave structure, the fundamental coupling impedance is greatly improved, the backward wave oscillation caused by harmonic wave is avoided at the same time, thus the improvement of the output power and efficiency of a traveling wave tube is facilitated, at the same time the frame-pole slow-wave structure can be realized by using the microfabrication technology, and the printed type and small targets of the traveling wave tube can be realized.

Description

technical field [0001] The patent of the invention belongs to the technical field of microwave vacuum electronics, and relates to a traveling wave tube amplifier, in particular to a frame-rod slow wave circuit structure. Background technique [0002] With the rapid development of electronic warfare and space technology in the future, more and more attention has been paid to the application of millimeter waves, and the traveling wave tube is the most important millimeter wave power source. However, in the foreseeable long period of time in the future, traveling wave tubes still have an irreplaceable status and are the most important components of millimeter wave military electronic equipment. [0003] The slow wave line is the core component of the traveling wave tube. It is the mechanism for electron injection and excitation of microwave energy in the traveling wave tube. Therefore, its high-frequency characteristics directly determine the performance of the traveling wave t...

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Problems solved by technology

[0007] However, the fundamental wave coupling impedance of the rectangular helical TWT is relatively small, which is easy to cause harmonic oscillation, thus limiting its application development.

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