Influence of Initial Stresses and Piezoelectric Constants on the Propagation Bulk Acoustic Waves in an Anisotropic Smart Material (Aluminum Nitrite)

2016 ◽  
Vol 13 (10) ◽  
pp. 6488-6494 ◽  
Author(s):  
Abo-el-nour N Abd-alla ◽  
Fatimah Alshaikh ◽  
Idir Mechai ◽  
I. A Abbas
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
High Performance ◽  
Plane Waves ◽  
Initial Stresses ◽  
Bulk Acoustic Wave ◽  
Sound System ◽  
Bulk Acoustic Waves ◽  
Anisotropic Elastic ◽  
Piezoelectric Constants

The aim of this paper is to illustrate the effect of initial stresses on the propagation of plane waves in a general anisotropic elastic medium. Therefore, an analytical analysis supported by numerical tests to calculate the bulk acoustic wave propagation in Aluminum Nitrite (AlN) as piezoelectric hexagonal elastic material has been presented. In addition, the Christoffel’s equation has been solved and the corresponding eigenvalues and eigenvectors have been obtained. Then, an explicit expressions of the waves propagation with three distinct phase velocities in anisotropic piezoelectric material including the effect of the initial stresses have been derived. The three velocities of bulk acoustic waves (BAW) which are called quasi-longitudinal, quasi-shear vertical and quasi-shear horizontal for Aluminum Nitrite are numerically calculated. The numerical examples are considered to illustrate graphically the effect of initial stresses on the variations of velocities of the BAW versus the angle of the propagation. The velocities of BAW change significantly with initial stresses as well as piezoelectric constants. This research is theoretically useful in signal processing, sound system, wireless communication and for the design of surface acoustic wave (SAW) devices with high performance.

Design of Solid Mounted Components Using Bulk Acoustic Wave Technology for Communication

2012 ◽  
Vol 433-440 ◽  
pp. 7579-7582
Author(s):  
B Venkatalakshmi ◽  
K Radhika
Keyword(s):  
Acoustic Wave ◽  
Communication Systems ◽  
High Performance ◽  
Acoustic Resonator ◽  
Bulk Acoustic Wave ◽  
Design System ◽  
Communication Industry ◽  
Rf Design ◽  
Recent Addition ◽  
Run Up

Low power and portable systems working at high frequency are becoming a significant force in the communication industry. SAW filters have been used in wireless communication systems since the early days of mobile phones. But applications at the higher handset frequencies run up against the capability of conventional SAW structures. Bulk Acoustic Wave (BAW) Technology, a relatively recent addition to this portfolio follows MEMS principle to design high performance microwave components for RF communication. Simulation of the Bulk Acoustic Resonator using Butterworth Van Dyke Model (BVD) Model and design of Ladder Filter with the designed resonator in the RF design platform Agilent ADS (Advanced Design System) have been presented. The simulated results confirm the tuning of operating frequency of designed BAW device at 2.4 GHz.

The mathematical modeling for bulk acoustic wave propagation velocities in transversely isotropic piezoelectric materials

2015 ◽  
Vol 22 (4) ◽  
pp. 823-836 ◽  
Author(s):  
Abo-el-nour N Abd-alladan ◽  
Abdelmonam M Hamdan ◽  
Adel A Almarashi ◽  
Antonio Battista
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
Piezoelectric Effect ◽  
Piezoelectric Materials ◽  
Transversely Isotropic ◽  
Bulk Acoustic Wave ◽  
Acoustic Wave Propagation ◽  
Wave Velocities ◽  
Saw Devices ◽  
Propagation Velocities

The objective of this paper is to study the bulk acoustic wave (BAW) propagation velocities in transversely isotropic piezoelectric materials, aluminum nitride, zinc oxide, cadmium sulfide and cadmium selenide. The bulk acoustic wave velocities are computed for each direction by solving the Christoffel’s equation based on the theory of acoustic waves in anisotropic solids exhibiting piezoelectricity. These values are calculated numerically and implemented on a computer by Bisection Method Iterations Technique (BMIT). The modification of the bulk acoustic wave velocities caused by the piezoelectric effect are graphically compared with the velocities in the corresponding non-piezoelectric materials. The results obtained in this study can be applied to signal processing, sound systems and wireless communication in addition to the improvement of surface acoustic wave (SAW) devices and military defense equipment.

scholarly journals Bulk Acoustic Wave Characteristics of Pseudo Lateral-Field-Excitation on LGT Single Crystal for Liquid Phase Sensing

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1076 ◽  
Author(s):  
Jiachao Xu ◽  
Tingfeng Ma ◽  
Liang Yan ◽  
Mingfei Wang ◽  
Ji Wang ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Acoustic Wave ◽  
High Performance ◽  
Bulk Acoustic Wave ◽  
Shear Mode ◽  
Crystallographic Axis ◽  
Lateral Field ◽  
Wave Characteristics ◽  
Field Excitation ◽  
The One

In the present study, pseudo lateral-field-excitation (LFE) bulk acoustic wave characteristics on LGT crystals are investigated to increase the sensitivity of LFE devices on the liquid characteristic variations. The cut orientation of LGT crystals for pseudo-LFE is investigated and verified experimentally. For an LFE device in the pseudo-LFE mode, the thickness shear mode wave is excited by the thickness field rather than the lateral field. The present work shows that when the (yxl) 13.8° LGT plate is excited by the electric field parallel to the crystallographic axis x, it operates in the pseudo-LFE mode. Moreover, characteristics of devices including the sensitivity and impedance are investigated. The present work shows that sensitivity of LFE devices to variation of the conductivity and permittivity of the aqueous solution are 9 and 3.2 times higher than those for AT-cut quartz crystal based devices, respectively. Furthermore, it has been found that the sensitivity of the LGT LFE sensor to liquid acoustic viscosity variations is 1.4 times higher than the one for the AT-cut quartz sensor. The results are a critical basis of designing high-performance liquid phase sensors by using pseudo-LFE devices.

Bulk-acoustic waves radiated from low-loss surface-acoustic-wave resonators

2004 ◽  
Vol 84 (9) ◽  
pp. 1579-1581 ◽  
Author(s):  
J. V. Knuuttila ◽  
J. J. Vartiainen ◽  
J. Koskela ◽  
V. P. Plessky ◽  
C. S. Hartmann ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Acoustic Waves ◽  
Low Loss ◽  
Bulk Acoustic Waves ◽  
Acoustic Wave Resonators

scholarly journals Acoustic Biosensors and Microfluidic Devices in the Decennium: Principles and Applications

Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 24
Author(s):  
Minu Prabhachandran Nair ◽  
Adrian J. T. Teo ◽  
King Ho Holden Li
Keyword(s):  
Acoustic Wave ◽  
Biological Samples ◽  
Acoustic Waves ◽  
Piezoelectric Materials ◽  
Bulk Acoustic Wave ◽  
Label Free ◽  
The Past ◽  
Microfluidic Actuation ◽  
Materials Used ◽  
Wave Modes

Lab-on-a-chip (LOC) technology has gained primary attention in the past decade, where label-free biosensors and microfluidic actuation platforms are integrated to realize such LOC devices. Among the multitude of technologies that enables the successful integration of these two features, the piezoelectric acoustic wave method is best suited for handling biological samples due to biocompatibility, label-free and non-invasive properties. In this review paper, we present a study on the use of acoustic waves generated by piezoelectric materials in the area of label-free biosensors and microfluidic actuation towards the realization of LOC and POC devices. The categorization of acoustic wave technology into the bulk acoustic wave and surface acoustic wave has been considered with the inclusion of biological sample sensing and manipulation applications. This paper presents an approach with a comprehensive study on the fundamental operating principles of acoustic waves in biosensing and microfluidic actuation, acoustic wave modes suitable for sensing and actuation, piezoelectric materials used for acoustic wave generation, fabrication methods, and challenges in the use of acoustic wave modes in biosensing. Recent developments in the past decade, in various sensing potentialities of acoustic waves in a myriad of applications, including sensing of proteins, disease biomarkers, DNA, pathogenic microorganisms, acoustofluidic manipulation, and the sorting of biological samples such as cells, have been given primary focus. An insight into the future perspectives of real-time, label-free, and portable LOC devices utilizing acoustic waves is also presented. The developments in the field of thin-film piezoelectric materials, with the possibility of integrating sensing and actuation on a single platform utilizing the reversible property of smart piezoelectric materials, provide a step forward in the realization of monolithic integrated LOC and POC devices. Finally, the present paper highlights the key benefits and challenges in terms of commercialization, in the field of acoustic wave-based biosensors and actuation platforms.

scholarly journals Correlation of BAW and SAW properties of langasite at elevated temperatures

2015 ◽  
Vol 4 (2) ◽  
pp. 331-340 ◽  
Author(s):  
M. Schulz ◽  
E. Mayer ◽  
I. Shrena ◽  
D. Eisele ◽  
M. Schmitt ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Acoustic Waves ◽  
Elevated Temperatures ◽  
Surface Acoustic Waves ◽  
Propagation Loss ◽  
Bulk Acoustic Wave ◽  
Coupling Coefficients ◽  
Data Set ◽  
Acoustic Wave Devices ◽  
Bulk Acoustic Wave Resonators

Abstract. The full set of electromechanical data of langasite (La3Ga5SiO14) is determined in the temperature range from 20 to 900 °C using differently oriented bulk acoustic wave resonators. For data evaluation a physical model of vibration is developed and applied. Thereby, special emphasis is taken on mechanical and electrical losses at high temperatures. The resulting data set is used to calculate the properties of surface acoustic waves. Direct comparison with experimental data such as velocity, coupling coefficients and propagation loss measured using surface acoustic wave devices with two different crystal orientations shows good agreement.

Characterization of a Protein Using Saw Resonator

2014 ◽  
Vol 23 (01n02) ◽  
pp. 1420006 ◽  
Author(s):  
Jonathan Kahl ◽  
Vishal M. Dhagat ◽  
Devendra Kalonia ◽  
Faquir C. Jain
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Acoustic Waves ◽  
High Performance ◽  
Applied Pressure ◽  
Acoustic Energy ◽  
Bulk Wave ◽  
Saw Devices ◽  
Operational Capabilities ◽  
Sensing Platform

Surface Acoustic Wave (SAW) propagation on the surface of a piezoelectric crystal is used as a carrier of information. SAW Sensors are micro-electromechanical systems (MEMS) in which high frequency acoustic waves travel close to the surface of a piezoelectric substrate. Because of confined acoustic energy near the surface within the range of one acoustic wavelength, SAW devices are highly sensitive for surface perturbation such as molecular absorption or adsorption and change of viscoelastic properties. Surface acoustic wave (SAW) devices are very promising in providing a high-performance sensing platform with wireless and remote operational capabilities. Research focus is on studying methods to characterize conductance, susceptance, viscosity, and other properties of protein samples, like albumin using SAW related resonator devices quickly and inexpensively using quantities of less than one Nano-liter. Applied pressure or bending of the quartz sets up a condition where a separation of charge occurs (due to change in dipole moment density). The potential difference is proportional to the magnitude of stress. When a mass is deposited on the electrode the resultant decrease in resonant frequency can detect mass changes at nanogram level. We propose to advance the sensitivity of the characterization by use of quartz SAW resonators since they can operate at much higher frequency than bulk wave oscillators.

High-Performance Film Bulk Acoustic Wave Pressure and Temperature Sensors

2007 ◽  
Vol 46 (4A) ◽  
pp. 1392-1397 ◽  
Author(s):  
Kuan-Hsun Chiu ◽  
Hong-Ren Chen ◽  
Star Ruey-Shing Huang
Keyword(s):  
Acoustic Wave ◽  
High Performance ◽  
Temperature Sensors ◽  
Bulk Acoustic Wave ◽  
Wave Pressure ◽  
Film Bulk
Sign in / Sign up

Export Citation Format

Share Document