Broadband thin sound absorber based on hybrid labyrinthine metastructures with optimally designed parameters

摘要

Schematic illustration of an unit cell. ( ) The schematic configuration of an individual unit cell of the proposed sound absorber which is chosen to consist of 4 resonance elements. The green zigzag line indicates the substantially-elongated propagation distance of incident wave within the th sub-unit cell. ( ) The typical zoom-in view of a single resonance element.