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We propose a new structure of ZnO or AlN thin film bulk acoustic wave filters using a ring-dot driving electrode operating with thickness-extensional modes. A theoretical analysis is performed to show the operating frequencies and modes of the proposed filter. The scalar differential equation by Tiersten and Stevens (1983) is used. An analytical solution is obtained. Numerical calculations based on...
In this paper, the electromagnetic energy harvesting scheme by using a Terfenol-D/PZT/Terfenol-D composite magnetoelectric (ME) transducer and a circuit is presented. In the experiments, the electrodes on the piezoelectric layer are connected by a circuit whose impedance is denoted by Z, which is the load impedance. we have analyzed and observed the load dependence of the ME coefficient and the basic...
Propagation of Rayleigh surface acoustic waves in a piezoelectric-piezomagnetic layered structure affected by a biasing electric field is studied analytically. Based on the three-dimensional equations of linear elasticity and the Maxwell equations, the differential equations of motion under a biasing electric field are derived and solved. The dispersion relations are obtained and discussed by regarding...
The paper analyzes the propagation of Rayleigh-type surface acoustic waves in a layered piezomagnetic/piezoelectric structure affected by a biasing magnetic field. The materials are assumed to be transversely isotropic. The governing equations under a biasing magnetic field are acquired based on three dimensional magnetoelectric theory. The dispersion relations are obtained and the phase velocities...
An analytical approach is taken to investigate shear horizontal surface acoustic wave propagation in viscoelastic/piezoelectric structure, where a viscoelastic material thin layer is bonded to a semi-infinite piezoelectric substrate. The analytical solution of dispersion relations are obtained for electrically open and shorted boundary conditions. The phase velocity, displacement and stresses are...
The paper investigates SH surface acoustic wave propagating in layered functionally graded piezomagnetic/piezoelectric structures loaded with viscous liquid. The coupling wave equations are obtained based on linearly the three-dimensional piezoelectric theory. The governing equations are solved by means of analytical method with consideration of electrically open and electrically shorted cases. The...
An analytical approach is taken to investigate Love wave propagating in layered piezoelectric structure where a thin piezoelectric film with a mass layer bonded to a semi-infinite elastic substrate. The governing equations of Love waves can be obtained on the basis of the linearly piezoelectric theory. The displacements, electric potential, stresses and electric displacement are continuous across...
With the rapid sophistication of film bulk acoustic resonators (FBAR) technology and increased demands for precision frequency control products, it is natural to make use of the detailed analysis of acoustic waves propagating in the FBAR structures for design and estimating electrical parameters before actual fabrication. To this purpose, it is essential to consider the material viscosity, which is...
The wireless communication technology demands for smaller size, high frequency, high performance, low energy consumption, and low cost RF components. Current products based on dielectric or SAW resonators are not enough either due to the size or the circuit loss. Film bulk acoustic resonators (FBAR) are the latest technology offering small size and high frequency RF components to the fast growing...
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