Superstructure-based multiband THz wave absorber

The invention relates to a superstructure-based multiband THz wave absorber, which comprises a plurality of wave absorbing units arranged in sequence. Each wave absorbing unit comprises a conductive reflecting layer, a dielectric layer and a microstructure unit layer which are laminated in sequence from bottom to top, and the microstructure unit layer is provided with a hollow snowflake-shaped structure; the snowflake-shaped structure comprises a regular hexagon center and six large branches which are identical in size and shape, the tail end of each large branch is connected with one edge of the regular hexagon center, and three sets of small branches are symmetrically arranged on the two sides of each large branch; and A group of small branches, B group of small branches and C group of small branches are sequentially arranged from far to near away from the center of the regular hexagon, the three groups of small branches on the same side are parallel to one another, the distance between two adjacent groups