Acoustic ventilation barrier realized by impedance modulation via non-local metasurface

Conventional acoustic barriers often face inherent compromises among noise insulation, ventilation efficiency, bandwidth, and pressure loss. In this study, we introduce a broadband acoustic ventilated barrier utilizing an impedance-modulated non-local metasurface, which enables precise control of the effective acoustic impedance through coupled neck-embedded Helmholtz resonator (NEHR) units. The innovative parallel configuration of these units facilitates strong non-local coupling, effectively suppressing anti-resonance and overcoming the narrowband limitations typical of traditional resonant sound-insulating structures. Experimental results validate the theoretical framework based on the mode matching method, demonstrating that the proposed barrier achieves over 90 % sound energy isolation (exceeding 10 dB transmission loss) across the 600–1600 Hz frequency range while maintaining a 20 % open ventilation area. This work establishes a new paradigm for ventilated sound-insulating barriers and offers a promising solution for broadband acoustic insulation in practical applications requiring simultaneous ventilation.