Dome trapezoidal staggered double-grid slow-wave structure

The invention discloses a dome trapezoidal staggered double-grid slow-wave structure and belongs to the technical field of electric vacuum devices. The structure includes two undulating portions on upper and lower sides. The undulating portions are mainly composed of a plurality of trapezoidal portions, circular groove portions and dome portions. The plurality of trapezoidal portions are orderly arranged at intervals in a horizontal direction, a circular groove portion for transition is set between adjacent trapezoidal parts, the trapezoidal portions are isosceles trapezoids with heights extending in a longitudinal direction on a longitudinal section parallel to the horizontal direction, upper bottoms of the isosceles trapezoids on the upper and lower sides are set on sides close to a belt-shaped electron injection channel, the dome portions are connected to upper bottoms of the isosceles trapezoids, and a circular groove portion for transition is set between lower bottoms of two adjacent trapezoidal portions