A great need exists for vibration and noise control with thinner and smaller devices, especially at lower frequencies than those at which the usual magnetic and electrical metamaterials operate. Acoustic metamaterials have been under development for such purposes. Some of the present authors have experimentally and numerically investigated circular acoustic metamaterials made of lexan plate and silicon membranes. In this work, the authors extend the investigation to the use of some other materials and relative see if and how well such a construction may be utilized for meta-material applications.

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