Two metasurface absorber designs using 16-unit supercells with coiled and gradient channels achieve >0.8 absorption from 458-968 Hz (5.2 cm thick) and 231-491 Hz (10.4 cm thick).
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Broadband ultra-thin acoustic metasurface absorber
Two metasurface absorber designs using 16-unit supercells with coiled and gradient channels achieve >0.8 absorption from 458-968 Hz (5.2 cm thick) and 231-491 Hz (10.4 cm thick).