Investigation on the Band Gap and Negative Properties of Concentric Ring Acoustic Metamaterial

Figure 1

Cross-sectional views of 2D acoustic metamaterials in single-oscillator, dual-oscillator, and triple-oscillator systems (a–c); units in square lattice arrangement (lattice constant = 10 mm) and schematic diagram of the first Brillouin zone (d). Note. Shaded area is the irreducible Brillouin zone. Points , , and are irreducible Brillouin vertexes.

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(b)

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