Tunable piezoelectric phononic crystal plates

Propagation of guided Lamb waves in a piezoelectric phononic plate, on which metallic electrodes are laid on periodically, is studied. Electric boundary conditions (EBCs) applied on the electrodes induce some changes in the effective elastic properties of the plate. More particularly, the case of inductive impedance charges connected on the PC is investigated. This configuration enables the creation of low-frequency gap in the sub-wavelength regime.