Wireless drive of a piezoelectric plate by dipole antenna

Wireless drive of a piezoelectric plate using an electric dipole antenna-like structure is explored in this work. The AC electric field, produced by plate-shaped live and ground electrodes of the antenna-like structure is transmitted to the piezoelectric plate placed at the center 6 mm away from the electrode plane. When the driving frequency is close to mechanical resonance frequency of the piezoelectric plate operating in the thickness vibration mode, a maximum output power of 3.12 mW is achieved with 1200 V_rms, 2500 cm² each electrode area and 5 cm electrodes separation of dipole antenna-like structure. An equivalent circuit of the wirelessly driven piezoelectric plate is developed which has a current source that is different from the equivalent circuit of conventional piezoelectric plate driven by a voltage applied via lead wires. The electric field pattern is studied by finite element method to assess the field on the surface of the piezoelectric plate. The theoretical output power characteristics well agree with the experimental results. It shows that the method has potential applications in the wireless drive of small-dimension piezoelectric devices.