We present a low-frequency dual-band (303 and 356Hz) perfect acoustic absorption (PA) metaporous. The metaporous composite is constructed by introducing Helmholtz resonance and Fabry–Prot resonance in porous materials. Our simulations show that the dual-band metaporous absorber has an ultra-thin thickness (λ/18 for 356Hz). Using the coupling of the three dual-band PA absorbers, the low-frequency high-efficiency (>90%) broadband acoustic absorption is obtained in the frequency range of 332–562Hz. Experiments confirm the dual-band perfect acoustic absorption and high-efficiency broadband acoustic absorption. The metaporous composite could have promising potential for low-frequency noise reduction.

我们提出了一种低频双频带（303 和 356Hz）完美的吸声 (PA) 变孔。通过在多孔材料中引入亥姆霍兹共振和法布里-普罗共振来构建介孔复合材料。我们的模拟表明，双波段变孔吸收器具有超薄的厚度（356Hz 的λ /18）。利用三个双频PA吸波器的耦合，在332-562Hz频率范围内获得低频高效率（>90%）宽带吸声。实验证实了双频段完美吸声和高效宽带吸声。这种介孔复合材料可能具有降低低频噪声的潜力。