Metamaterial-based low-frequency-band slow wave structure

The invention relates to a microwave source device in the field of high-power microwaves, in particular to a metamaterial-based low-frequency-band slow wave structure which comprises a first metamaterial resonance unit, a second metamaterial resonance unit and a circular waveguide. The first metamaterial resonance unit and the second metamaterial resonance unit are in 45-degree rotation coupling arrangement to form a single period of the slow wave structure. The metamaterial-based low-frequency-band slow wave structurehas the following technical advantages that the metamaterial-basedslow wave structure can work below the cut-off frequency of the hollow metal circular waveguides with the same size, and has the advantage of transverse miniaturization; due to the sub-wavelength characteristic of the metamaterial, the slow wave structure is shorter in period and has the advantage of miniaturization in the axial direction; due to the local field enhancement effect of the metamaterial-based slow-wave structure, the