Fig. 16: The constructions of AVMs through the coupling of Helmholtz resonance and membrane resonance.
From: Resonance-based acoustic ventilated metamaterials for sound insulation
a AVM composed with a membrane structure and a side Helmholtz resonator and transmission loss. Reproduced with permission from ref. 172. b Meta-muffler constructed with a layer of membrane material in ring-shape embedding in a circle Helmholtz cavity, and transmission loss spectra. Reproduced with permission from ref. 173.
