Microstrip slow-wave structure transmission system suitable for wide dielectric substrate

Abstract

The invention discloses a microstrip slow-wave structure transmission system suitable for a wide dielectric substrate, and relates to the technical field of microwave electric vacuum. The system is characterized in that the side wall of a vacuum cavity is provided with two groups of first protrusions and two groups of second protrusions, and the two groups of first protrusions and the two groups of second protrusions are located on the side, where a microstrip slow-wave line is arranged, of the dielectric substrate; the two groups of first protrusions and the two groups of second protrusions are arranged at intervals along the microwave propagation direction of the microstrip slow-wave line, and the two groups of second protrusions are located between the two groups of first protrusions; and the transverse width of the first protrusions is larger than that of the second protrusions. By creatively changing the shape of the inner wall of a metal shell, the cut-off frequency of microwaves transmitted at multiple positions is suddenly changed, namely new capacitive reactance and inductive reactance are introduced into the slow-wave structure, and the effects of filtering out a waveguide mode and improving the transmission performance of the slow-wave structure are achieved; and the problem that the reflection and transmission loss of the wide dielectric substrate microstrip slow-wave structure during microwave signal transmission is effectively solved.

Description

technical field [0001] The invention relates to the field of microwave electric vacuum technology, more specifically, it relates to a microstrip slow-wave structure transmission system suitable for wide dielectric substrates. Background technique [0002] Microwave electric vacuum device refers to an electronic system that uses the movement of charged particles between electrodes to realize the oscillation or amplification of microwave signals in a vacuum state. It has the advantages of high power, high frequency, radiation resistance, and strong environmental adaptability. It is used in many fields of national defense weaponry and national economy. [0003] Currently, traveling wave tubes are one of the most widely used power amplifiers in microwave vacuum electronics. As the core place where the electron beam and the microwave interact with each other in the TWT, the performance of the slow-wave structure greatly affects the working performance of the TWT. The traditiona...

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Problems solved by technology

However, when the lateral width of the dielectric substrate is wide, it will be difficult to achieve a good match between the microstrip slow-wave structure and the input and output waveguides, resulting in that part of the microwave is not converted into the quasi-TEM mode required for microstrip propagation after being input from the waveguide, but is still in the waveguide mode. Propagate in the slow wave structure, which leads to large reflection and poor transmission performance of the microstrip slow wave transmission system, which will affect the normal operation of the slow wave structure

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