ucture has acoustic resonant effect. The SHS materials reveal strong sound absorption nearР the resonant frequency. Then, nested SHS (NSHS) model can be designed by integrating two different sized SHS intoР a single structure. The NSHS metasurface materials fabricated by arranging designed NSHS in air matrix presentР high-efficient sound absorption in two frequency band simultaneously. Finally, the NSHS materials with sponge matrixР achieve broadband high sound absorption in low frequency range of 500-1200Hz.РР Key Words: acoustic metasurface; dual-band sound absorption; broadband sound absorption; SHS; NSHS; localР resonanceРРР Received: 2021-12-18； Revised: 2022-01-15； Accepted: 2022-03-11Р Foundation item: Aeronautical Science Foundation of China(2018ZF53071)
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