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We theoretically and experimentally propose two designs of broadbandlow-frequency acoustic metasurface absorbers (Sample I/Sample II) for thefrequency ranges of 458Hz~968Hz and 231Hz~491Hz (larger than 1 octave), withabsorption larger than 0.8, and having the ultra-thin thickness of 5.2cm and10.4cm respectively ({\lambda}/15 for the lowest working frequency and{\lambda}/7.5 for the highest frequency). The designed supercell consists of 16different unit cells corresponding to 16 eigen frequencies for resonantabsorptions. The coupling of multiple resonances leads to broadband absorptioneffect in the full range of the targeted frequency spectrum. In particular, wepropose to combine gradient-change channel and coiled structure to achievesimultaneous impedance matching and minimal occupied space, leading to theultra-thin thickness of the metasurface absorbers. Our conceived ultra-thinlow-frequency broadband absorbers may lead to pragmatic implementations andapplications in noise control field.

Broadband ultra-thin acoustic metasurface absorber