Tunable composite waveguide based on piezoelectric phononic crystal

The acoustic artificial structures with tunable parameters have attracted much research interest in these days. In this paper, we present a tunable composite waveguide based on the piezoelectric phononic crystal shunted by an inductor circuit. A pass band based on local resonance will emerge in the complete band gap through modulating the shunted inductor circuit. This local-resonant pass band can be used to realize a waveguide. Both the work frequency and the shape of this waveguide can be tuned simultaneously by modulating the inductance and the space distribution of the external inductor circuit. For the excellent tunable ability, the proposed tunable composite waveguide could be useful in elastic wave sensors and frequency filters.