Figure 11
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Based on a third-stage CCFFPCs with a filling ratio of K = 3 and M = 5, while maintaining r1 = 0.1667 a and r2 = 0.06 a unchanged, circular cores of different radii are filled at the center of the edge of the basic phononic crystal. The band structures of the configurations are as follows: (a) r3 = 0 m, (b) r3 = 0.0479 a, (c) r3 = 0.0958 a, (d) r3 = 0.1917 a.
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