Figure 5
From: Bilayer ventilated labyrinthine metasurfaces with high sound absorption and tunable bandwidth
Performance of a 3D printed bilayer labyrinthine metasurface with spacing \(d=0\) and open area ratio \(p_{o}=0.5\). The left curled channel in the unit cell contains an appropriate amount of porous media, and the right curled channel is hollow. Other parameters are \(a=43\) mm, \(b=107\) mm, and \(t=1\) mm. (a)–(c) Measured reflection, transmission, and absorption spectra. (d)–(f) Calculated reflection, transmission, and absorption spectra. Blue and red symbols/curves are for sound waves incident from the left and right, respectively.
