Novel medium-metal terahertz slow wave structure

Abstract

The invention relates to the technical field of terahertz waves, and discloses a novel medium-metal terahertz slow wave structure, which comprises at least one waveguide for directionally guiding electromagnetic waves. The electromagnetic waves directionally flow in an electron beam channel on the waveguide, and the outer walls of the two sides of the electron beam channel are covered with insulating medium layers, and the phase velocity of the electromagnetic wave is reduced through the insulating dielectric layer. High-density polyethylene with a low loss coefficient in a terahertz frequency band is attached to the rectangular gate of the rectangular staggered gate slow-wave structure, so that the purposes of reducing the phase velocity of electromagnetic waves in the slow-wave structure and improving the coupling impedance in the terahertz frequency band are achieved; the metal gates above and below the electron beam channels are staggered, the top of the rectangular metal gate is covered with graphene to prevent electrons from gathering in a medium, and the medium is prevented from being broken down.

Description

technical field [0001] The invention relates to the technical field of terahertz waves, in particular to a novel dielectric-metal terahertz slow wave structure. Background technique [0002] Terahertz (THz) waves generally refer to electromagnetic waves with a frequency in the range of 0.1-10 THz. The low-frequency region of the THz wave band is connected with millimeter waves, and the high-frequency region is connected with infrared waves. To develop terahertz technology, the first task is to solve the problem of terahertz wave source. At present, there are three types of wave sources that can generate terahertz waves, namely semiconductor lasers, photonic radiation lasers and vacuum electronic devices. Among them, the output power of semiconductor lasers and photonics radiation lasers can only reach the order of microwatts and milliwatts. The urgent need for technology popularization. Vacuum electronic devices are a huge family. Among many electric vacuum devices, trave...

AI Technical Summary

Problems solved by technology

However, most traditional traveling wave tubes, such as folded waveguide traveling wave tubes, sine wave guiding traveling wave tubes, and staggered double-grid traveling wave tubes, have all-metal waveguide structures. The roughness is relatively close to the skin depth in the terahertz band, which will cause the electric field near the metal grid to attenuate sharply, resulting in a decrease in the coupling impedance of the slow wave structure, which cannot meet the gain requirements of the traveling wave tube

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