Dispersion characteristics of the two-dimensional sonic crystals consisting of elliptic rods are investigated. Due to the geometric anisotropy of the elliptic rods, we can obtain different structure factors for varying the equifrequency surfaces, (EFSs) and the refractive direction can be tuned. The plane wave expansion method is used to calculate the EFSs for the sonic crystals with a triangular lattice. The pressure distribution in the sonic crystal is also obtained by the finite element method. The refraction angles are found to be dependent on the frequency of the incident wave and the orientation angle of the elliptic rods. By employing the dispersion characteristics of the elliptic rod sonic crystal, we can design and develop new acoustic devices, such as acoustic switches and splitters.
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Wu et al. (2007) studied this question.