Surface Acoustic Wave Devices for Harsh Environment (original) (raw)
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Modeling of Interdigital Transducer Surface Acoustic Wave Device - Design and Simulation
2015 Fifth International Conference on Communication Systems and Network Technologies, 2015
Linear network model configuration is used to show the transducer as a chain of identical ports which are acoustically in cascade but electrically in parallel. The admittance, impedance, transfer function and insertion loss of the equivalent circuit network of the surface acoustic wave transducers made of 64 0 YZ LiNbO 3 at a frequency of 400 MHz are studied and analyzed with the help of MATLAB. Design formulation are based on a two dimensional piezoelectric transducers operating at 400 MHz The frequency dependence of Radiation Conductance and Acoustic Susceptance are studied with the help of Impulse Response method. The impulse response method is used for the calculation of transducer input admittance and filter frequency response with much less computational effort than required by earlier approaches. A high quality factor with very low insertion loss is obtained.
Interdigital sensors and transducers
Proceedings of The IEEE, 2004
This review paper focuses on interdigital electrodes-a geometric structure encountered in a wide variety of sensor and transducer designs. Physical and chemical principles behind the operation of these devices vary so much across different fields of science and technology that the common features present in all devices are often overlooked. This paper attempts to bring under one umbrella capacitive, inductive, dielectric, piezoacoustic, chemical, biological, and microelectromechanical interdigital sensors and transducers. The paper also provides historical perspective, discusses fabrication techniques, modeling of sensor parameters, application examples, and directions of future research. be used for consumer electronics and in telecommunications. SAW devices have been made to meet the needs of acoustic filter technology [6], and later spanned fields of communication, signal processing, chemical sensing, nondestructive evaluation, and biomedical applications. Extensive reviews of acoustic sensor technology have been written , and somewhat reduce the need for the acoustic sensor technology coverage in this paper.
In this paper, we present study on the mass loading effect of the interdigital transducer (IDT) on surface acoustic wave (SAW) velocity in SAW devices, using COMSOL Multiphysics™. An IDT consists of metallic comb-shaped electrodes normally fabricated over the surface of the piezoelectric substrate. Owing to the mass load of metallic IDTs over substrate the surface wave's velocity reduces. We have simulated a one port SAW resonator represents the mass loaded device made on YZ-cut lithium niobate substrate and investigated the reduction of SAW velocity caused by the mass loading of metal IDT. An Eigen frequency analysis provided by COMSOL Multiphysics™ is useful for finding the true surface and bulk wave velocities in the absence of IDT. The surface wave velocity and the bulk wave velocity are observed. The surface plots of surface and bulk standing waves in the device with IDT and without IDT are shown.
Applied Physics Letters, 2004
Using high-quality epitaxial c-axis Pb͑Zr 0.2 Ti 0.8 ͒O 3 films grown by off-axis magnetron sputtering onto metallic (001) Nb-doped SrTiO 3 substrates, a nonconventional thin-film surface acoustic wave device based on periodic piezoelectric transducers was realized. The piezoelectric transducers consist of a series of ferroelectric domains with alternating polarization states. The artificial modification of the ferroelectric domain structure is performed by using an atomic force microscope tip as a source of electric field, allowing local switching of the polarization. Devices with 1.2 and 0.8 m wavelength, defined by the modulation period of the polarization, and corresponding to central frequencies in the range 1.50-3.50 GHz have been realized and tested.
Design and Fabrication of IDT Surface Acoustic Wave Device For Biosensor Application
The Surface Acoustic Wave (SAW) is one of sensor types that can be used in multifunction in the sensing field. Hence, the purpose of this project is to study and investigate the design of SAW device for biosensor application. Several parameters and design has been varied and proposed to investigate the effect to the SAW Biosensor performance. The parameter such as total SAW IDT fingers and Split IDT design has successfully designed using AutoCAD software and fabricated using conventional lithography method. The Aluminum IDT was fabricated on ZnO/Si piezoelectric substrate and show a good result in term of electrical characterization and frequency response. From result, the proposed design with many fingers can increase the center frequency response while the split design control the insertion loss. It shows that these designs are suitable to apply in the SAW biosensor application.
2013
This paper investigates the effects of electrical loading due to metallic interdigital transducer (IDT) on surface acoustic wave (SAW) velocity in SAW resonators by simulation using FEM in COMSOL Multiphysics. The IDT electrodes fabricated over the piezo-substrate short circuit the parallel electric field associated with SAW under the IDT during wave propagation and affect the SAW phase velocity. The simulation considers a SAW resonator with massless infinite number of IDT fingers on Y Z cut lithium niobate substrate. The changes in resonance frequency and SAW phase velocity of SAW resonator due to electrical loading are studied for various metallization ratios. The electric field distribution at the surface of piezo-substrate is obtained and it is observed that the short circuit of the electric field due to metallic IDT reduces the SAW phase velocity; consequently, the resonance frequency of the SAW device decreases. © 2013 The Authors. Published by Elsevier Ltd. Selection and peer...
Proceedings of SPIE, 2007
Starting with an introduction to surface acoustic waves, their generation and detection using interdigital transducers (IDTs) on piezoelectric materials (e.g. LiNbOj and ZnO) will be reviewed. Then the application of surface acoustic waves in electronic devices will be presented. Moreover, recent studies, using the technique of attaching the material of investigation onto the sound path of the acoustic delay line between the IDTs is discussed.