▎ 摘　　要

NOVELTY - The structure has a waveguide which is used for directional guidance of electromagnetic waves. The electromagnetic waves flow directionally in electron injection channels (2a) on the waveguide. The electron injection channels on both sides have an outer wall covered with an insulating medium layer (1). The phase velocity of the electromagnetic wave is reduced by the insulating medium layer. The electromagnetic wave is a terahertz wave. A material of the insulating dielectric layer includes polyethylene. An easily conductive material (3) includes graphene. USE - Medium-metal terahertz slow wave structure for use in semiconductor laser, photonics radiation laser and vacuum electronic device. ADVANTAGE - The outer wall of two sides of the electronic injection channel is covered with a layer of medium capable of effectively reducing the phase speed of the electromagnetic wave, so as to achieve the purpose of stable and reduce the normalized phase speed curve. The electromagnetic wave passes through two times of refraction and reflection of the medium and the metal, to enhance the electric field intensity in the injection channel and to improve the coupling impedance. The high density polyethylene with low loss coefficient of terahertz frequency band is attached on the rectangular grid of the rectangular staggered grid slow wave structure, to realize the purpose for reducing electromagnetic wave phase speed in slow wave structures and to improve tera hertz frequency bands coupling the metal grid on the upper and lower of the injection channels are staggered. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a single-period slow-wave structure of a new-type medium-metal terahertz slow-wave structure. Insulating medium layer (1) Electron injection channel (2a) Upper rectangular grid (2b) Easily conductive material (3)