Slow wave structure of coplanar electromagnetic band-gap meander line microwave

Abstract

The invention discloses a slow wave structure of a coplanar electromagnetic band-gap meander line microwave. The slow wave structure comprises a dielectric substrate, wherein an electromagnetic band-gap structure is arranged on the dielectric substrate. The electromagnetic band-gap structure is a two-dimensional electromagnetic band-gap structure composed of periodically-arranged metal patches, the metal patches are connected through planar meander line structures, and the planar meander line connected between two metal patches is symmetric. The structure utilizes the characteristic that the electromagnetic band-gap conducts waves in a conduction band and forbids waves in a forbidden band, so that the transmission loss of a fundamental mode is reduced, the coupling impedance of the slow wave structure is increased. The backward wave oscillation can be effectively inhibited, and the coupling efficiency of the fundamental mode is increased. Meanwhile, the structure can adopt the current microcircuit etching technology to directly manufacture corresponding structures on substrate materials, and the process is simple. As the structure is adopted, the backward wave oscillation can be effectively inhibited, and the defects that the process is complex and the coupling efficiency of the fundamental mode is reduced as a concentrated attenuator is adopted are avoided.

Description

technical field [0001] The invention relates to a coplanar electromagnetic bandgap zigzag line microwave slow wave structure, which belongs to the technical field of physical electronics. Background technique [0002] The slow wave structure is mainly used in traveling wave amplifiers, particle accelerators, and devices that interact between electromagnetic waves and waves of lower speed (such as sound waves, magnetostatic waves, etc.), and its role is to make the interaction over a longer distance and a longer time Ongoing. In this system, the phase velocity of electromagnetic waves is lower than the speed of light in space, so that the energy of moving charged electron particles or low-speed waves can be effectively converted into the energy of electromagnetic waves. [0003] Miniaturization and planar traveling wave tubes are the main ways to reduce the manufacturing cost of traveling wave tubes, reduce the volume and break through the upper limit of frequency. Pioneeri...

AI Technical Summary

Problems solved by technology

Therefore, although the use of the attenuator suppresses the generation of reverse harmonics very well, it also has a certain loss in the microwave working band transmission.

At the same time, the attenuator is at a specific position between the substrate material and the slow-wave circuit, and the coating process is used to build a coating or an insertion loss ceramic sheet, which increases the complexity of the process and is not conducive to improving the reliability of the slow-wave structure.

Images