Ventilative meta-window with broadband low-frequency acoustic insulation

Soundproofing ventilation devices can block sound while allowing free airflow simultaneously, which have many important applications in daily lives. In this work, we theoretically design and experimentally implement a broadband low-frequency acoustic meta-window. The meta-window is composed of a central rectangular open area and 12 surrounding identical channels. The total ventilation area is 220cm(2). Interestingly, with a deep subwavelength thickness of 4cm, such a meta-window can exhibit a large acoustic bandgap, leading to the effective blocking of more than 90% of the incident sound energy in the broad range of 605-1050Hz. By cascading such acoustic devices, the sound blocking effect can be further improved. Our work realizes a large-area and ultrathin ventilative meta-window with the function of broadband low-frequency acoustic insulation.

Automated summary

In this study, a broadband low-frequency acoustic meta-window was designed and implemented, which can block more than 90% of incident sound energy in a wide frequency range of 605-1050Hz. By cascading such acoustic devices, the sound blocking effect can be further improved, realizing a large-area and ultrathin ventilative meta-window with the function of broadband low-frequency acoustic insulation.