Tunable electrical Bragg band gaps in piezoelectric plates

In this paper, a piezoelectric plate poled along its thickness is considered. A periodic grating of electrodes is deposited on its top and bottom surfaces. An analytical model is developed considering wave propagation along the length of the plate. The device exhibits an electrical Bragg band gap that is open or closed, depending on the electrical boundary conditions applied on the electrodes. The analytical model is validated by comparison with the finite element method. Fabrication of the device and first measurements are also presented.