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

Figure 2

Band structure of single-oscillator acoustic metamaterial in the direction (a); transmission characteristic curve in the direction (b); normalized effective mass density, effective bulk modulus, and effective shear modulus (c–e). The blue regions represent the positions of band gaps. and represent a compression wave (-wave) and shear wave (-wave), respectively.

(a)

(b)

(c)

(d)

(e)