A low-frequency slow-wave structure based on metamaterials

Abstract

The invention relates to a microwave source device in the field of high-power microwaves, and is a low-frequency slow-wave structure based on metamaterials, comprising a first metamaterial resonance unit, a second metamaterial resonance unit and a circular waveguide; the first metamaterial resonance unit and the The second metamaterial resonant unit is arranged in a 45-degree rotational coupling to form a single period of the slow-wave structure; the present invention has the following technical advantages: using a metamaterial-based slow-wave structure, it can work below the cut-off frequency of a hollow metal circular waveguide of the same size , has the advantage of lateral miniaturization; due to the sub-wavelength characteristics of metamaterials, the slow-wave structure has a shorter period and has the advantage of miniaturization in the axial direction; due to the local field enhancement effect of the metamaterial slow-wave structure, the slow-wave structure has a higher coupling impedance, The device has the advantage of higher beam-wave interaction efficiency; the strong electromagnetic coupling between the slow-wave structures of metamaterials has a strong modulation of the relativistic electron beam, which makes the device have a shorter start-up time.

Description

technical field [0001] The invention relates to microwave source devices in the field of high-power microwaves, and is a low-frequency slow-wave structure based on metamaterials. Background technique [0002] High power microwave source, as the place where high power microwave is generated, is the core device in high power microwave system. Its working principle is to use relativistic electron beams to interact with the eigenmodes of high-frequency structures to obtain high-power microwave radiation. [0003] Traditional low-frequency high-power microwave sources such as relativistic klystrons, magnetically insulated wire oscillators, transition devices, relativistic magnetrons, etc., generally have insufficient miniaturization due to the demand for guiding magnetic fields and other reasons, and the devices are relatively large And the problem of low beam-wave interaction efficiency. [0004] Metamaterials are a kind of artificially designed subwavelength structures, which...

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Problems solved by technology

[0008] A scheme to improve the slow-wave structure of prior art 1 is proposed to overcome the problem of uneven axial electric field distribution in prior art 1, and to improve the beam wave of metamaterial slow-wave structures in the process of high-power microwave generation The interaction efficiency is optimized to obtain a metamaterial slow-wave structure with higher coupling impedance and larger space limit current, giving full play to the advantages of high beam-wave interaction efficiency of the metamaterial slow-wave structure, and improving all aspects of the existing technology 1 performance parameters, while continuing the miniaturization advantages of metamaterial slow-wave structures

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