scholarly journals The Radial Electric Field Excited Circular Disk Piezoceramic Acoustic Resonator and Its Properties

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 608
Author(s):  
Andrey Teplykh ◽  
Boris Zaitsev ◽  
Alexander Semyonov ◽  
Irina Borodina
Keyword(s):  
Electric Field ◽  
Electrical Impedance ◽  
Electromechanical Coupling ◽  
Surrounding Medium ◽  
Circular Disk ◽  
Radial Electric Field ◽  
Acoustic Resonator ◽  
Electromechanical Coupling Coefficient ◽  
Dimensional Finite Element ◽  
New Type

A new type of piezoceramic acoustic resonator in the form of a circular disk with a radial exciting electric field is presented. The advantage of this type of resonator is the localization of the electrodes at one end of the disk, which leaves the second end free for the contact of the piezoelectric material with the surrounding medium. This makes it possible to use such a resonator as a sensor base for analyzing the properties of this medium. The problem of exciting such a resonator by an electric field of a given frequency is solved using a two-dimensional finite element method. The method for solving the inverse problem for determining the characteristics of a piezomaterial from the broadband frequency dependence of the electrical impedance of a single resonator is proposed. The acoustic and electric field inside the resonator is calculated, and it is shown that this location of electrodes makes it possible to excite radial, flexural, and thickness extensional modes of disk oscillations. The dependences of the frequencies of parallel and series resonances, the quality factor, and the electromechanical coupling coefficient on the size of the electrodes and the gap between them are calculated.

Variation of Material Properties of Piezoelectric Ceramics due to Electric Loading Evaluated by Resonance Frequency

2007 ◽  
Vol 345-346 ◽  
pp. 1521-1524 ◽  
Author(s):  
Mamoru Mizuno ◽  
Nozomi Odagiri ◽  
Mitsuhiro Okayasu
Keyword(s):  
Electric Field ◽  
Resonance Frequency ◽  
Lead Zirconate Titanate ◽  
Material Properties ◽  
Electromechanical Coupling ◽  
Domain Switching ◽  
Piezoelectric Ceramics ◽  
Lead Zirconate ◽  
Electromechanical Coupling Coefficient ◽  
Resonance Frequencies

In the present paper, lead zirconate titanate (PZT) and lead titanate (PT) piezoelectric ceramics were subjected to both high electric field (which is higher than the coercive electric field) with low frequency and low electric field with high frequency (which is the resonance frequency). After applying certain electric field systematically, resonance and anti-resonance frequencies and an electrostatic capacity were measured by means of an impedance analyzer, and an electromechanical coupling coefficient, a dielectric constant, an elastic coefficient and a piezoelectric constant were evaluated from the frequencies and capacity measured. Then variation of the material properties in process of time was investigated experimentally, and the dependence of the variation of the properties due to mainly domain switching on conditions of applied electric field was elucidated.

Research on Electromechanical Properties of Cymbal Piezocomposite Transducer

2005 ◽  
Vol 475-479 ◽  
pp. 1087-1090
Author(s):  
Deng Hua Li ◽  
Ke Li ◽  
Yang Cheng
Keyword(s):  
Electric Field ◽  
Transmission Coefficient ◽  
Coupling Coefficient ◽  
Applied Electric Field ◽  
Piezoelectric Ceramic ◽  
Electromechanical Coupling ◽  
Applied Force ◽  
Electromechanical Coupling Coefficient ◽  
Electromechanical Properties ◽  
Piezoelectric Phase

The electromechanical properties of cymbal piezocomposite transducer were investigated in this paper. Piezoelectric ceramic PZT—5A was used as piezoelectric phase of transducer, and brass foil was used as end cap electrode of cymbal piezocomposite transducer. Several types of this transducer were fabricated. The displacements of this transducer as functions of the applied force and the applied electric field were investigated. It was calculated and analyzed for the energy transmission coefficient and electromechanical coupling coefficient of this transducer which optimum values were obtained.

Methods for improving electromechanical coupling coefficient in two dimensional electric field excited AlN Lamb wave resonators

2015 ◽  
Vol 106 (25) ◽  
pp. 253502 ◽  
Author(s):  
Chengliang Sun ◽  
Bo Woon Soon ◽  
Yao Zhu ◽  
Nan Wang ◽  
Samuel Pei Hao Loke ◽  
...  
Keyword(s):  
Electric Field ◽  
Coupling Coefficient ◽  
Lamb Wave ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Coefficient ◽  
Two Dimensional

scholarly journals Influence of Etching Trench on Keff2 of Film Bulk Acoustic Resonator

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 102
Author(s):  
Chao Gao ◽  
Yang Zou ◽  
Jie Zhou ◽  
Yan Liu ◽  
Wenjuan Liu ◽  
...  
Keyword(s):  
Electromechanical Coupling ◽  
Great Influence ◽  
Acoustic Resonator ◽  
Superior Performance ◽  
Electromechanical Coupling Coefficient ◽  
Rf Filters ◽  
Acoustic Resonators ◽  
Rf Communication ◽  
Film Bulk Acoustic Resonators ◽  
Film Bulk

As radio-frequency (RF) communication becomes more ubiquitous globally, film bulk acoustic resonators (FBAR) have attracted great attention for their superior performance. One of the key parameters of an FBAR, the effective electromechanical coupling coefficient (Keff2), has a great influence on the bandwidth of RF filters. In this work, we propose a feasible method to tune the Keff2 of the FBAR by etching the piezoelectric material to form a trench around the active area of the FBAR. The influence of the position of the etching trench on the Keff2 of the FBAR was investigated by 3D finite element modeling and experimental fabricating. Meanwhile, a theoretical electrical model was presented to test and verify the simulated and measured results. The Keff2 of the FBAR tended to be reduced when the distance between the edge of the top electrode and the edge of the trench was increased, but the Q value of the FBAR was not degraded. This work provides a new possibility for tuning the Keff2 of resonators to meet the requirements of different filter bandwidths.

Low frequency vibration suppression of a moderate thick cabin structure by multiple piezoelectric patches shunted with RL-double negative capacitance circuits

2021 ◽  
Vol 263 (5) ◽  
pp. 1299-1307
Author(s):  
Zhiwei Zheng ◽  
Feng Li ◽  
Xiuchang Huang ◽  
Zhiwei Su ◽  
Hongxing Hua
Keyword(s):  
Electromechanical Coupling ◽  
Vibration Suppression ◽  
Three Dimensional ◽  
Low Frequency ◽  
Electromechanical Coupling Coefficient ◽  
Double Negative ◽  
Low Frequency Vibration ◽  
Dimensional Finite Element ◽  
Trial And Error Method ◽  
Three Dimensional Finite Element

Multiple piezoelectric patches shunted with RL-double negative capacitances circuits, which are bonded on the bulkhead, are proposed to control the resonant response of multiple low frequency modes of a moderate thick cabin structure. Dynamic modeling of the electromechanical coupling system of the cabin structure and the piezoelectric shunt circuit is established by employing the three-dimensional finite element. Optimum tuning strategy is based on the trial and error method. It is shown that the proposed approach is effective in enhancing the generalized electromechanical coupling coefficient and controlling the low frequency modes that exhibits coupled deformation of the bulkhead and cabin structure.

Selective Band Gap to Suppress the Spurious Acoustic Mode in Film Bulk Acoustic Resonator Structures

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Rafik Serhane ◽  
Fayçal Hadj-Larbi ◽  
Abdelkader Hassein-Bey ◽  
Abdelkrim Khelif
Keyword(s):  
Band Gap ◽  
Electromechanical Coupling ◽  
Lamb Waves ◽  
Phononic Crystal ◽  
Longitudinal Mode ◽  
Acoustic Resonator ◽  
Electromechanical Coupling Coefficient ◽  
Spurious Mode ◽  
Film Bulk Acoustic Resonator ◽  
Film Bulk

In this work, we investigate numerically the propagation of Lamb waves in a film bulk acoustic resonator (FBAR) structure formed by piezoelectric ZnO layer sandwiched between two Mo electrodes coupled with Bragg reflectors; the system is thus considered as a phononic-crystal (PnC) plate. The aim is to suppress the first-order symmetric Lamb wave mode considered as a spurious mode caused by the establishment of a lateral standing wave due to the reflection at the embedded lateral extremities of the structure; this spurious mode is superposing to the main longitudinal mode resonance of the FBAR. The finite element study, using harmonic and eigen-frequency analyses, is performed on the section of FBAR structure coupled with the PnC. In the presence of PnC, the simulation results show the evidence of a selective band gap where the parasitic mode is prohibited. The quality factor of the FBAR is enhanced by the introduction of the PnC. Indeed, the resonance and antiresonance frequencies passed from 1000 and 980 (without PnC) to 2350 and 1230 (with PnC), respectively. This is accompanied by a decrease in the electromechanical coupling coefficient from 10.60% to 6.61%.

scholarly journals Fabrication of AlGaN High Frequency Bulk Acoustic Resonator by Reactive RF Magnetron Co-sputtering System

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7377
Author(s):  
Yu-Chen Chang ◽  
Ying-Chung Chen ◽  
Chien-Chuan Cheng
Keyword(s):  
Aluminum Gallium Nitride ◽  
High Frequency ◽  
Electromechanical Coupling ◽  
Acoustic Resonator ◽  
Bragg Reflector ◽  
Center Frequency ◽  
Electromechanical Coupling Coefficient ◽  
Axis Orientation ◽  
Sputtering Power ◽  
Sputtering System

In this study, aluminum gallium nitride (AlGaN) thin films are used as the piezoelectric layers to fabricate solidly mounted resonators (SMR) for high frequency acoustic wave devices. AlGaN film is deposited on a Bragg reflector, composed of three pairs of Mo and SiO2 films, through a reactive radio frequency (RF) magnetron co-sputtering system at room temperature. The optimized deposition parameters of AlGaN film have a sputtering power of 175 W for Al target, sputtering power of 25 W for GaN target, N2 flow ratio (N2/Ar + N2) of 60%, and sputtering pressure of 10 mTorr. The obtained AlGaN film has a smooth surface, uniform crystal grains, and strong c-axis orientation. The contents of Al and Ga in the AlGaN film, analyzed by energy dispersive X-ray spectroscopy (EDS) are 81% and 19%, respectively. Finally, the frequency response S11 of the obtained SMR device shows that the center frequency is 3.60 GHz, the return loss is about −8.62 dB, the electromechanical coupling coefficient (kt2) is 2.33%, the quality factor (Q) value is 96.93 and the figure of merit (FoM) value is 2.26.

The Characterization of Two Dimensional Electrostrictive CuInP2S6 Materials for Transducers

2006 ◽  
Vol 514-516 ◽  
pp. 230-234 ◽  
Author(s):  
Vytautas Samulionis ◽  
Juras Banys ◽  
Yulian Vysochanskii
Keyword(s):  
Electric Field ◽  
Electromechanical Coupling ◽  
Bias Field ◽  
Thin Plates ◽  
Electromechanical Coupling Coefficient ◽  
Two Dimensional ◽  
Coupling Coefficients ◽  
Bias Electric Field ◽  
Two Dimensional Materials ◽  
Dc Electric Field

The electromechanical properties of layered, two-dimensional materials of CuInP2S6 family have been investigated. It was shown that, at room temperature, which is above phase transition and under DC bias electric field, these materials behave as a piezoelectric because of electrostriction. In this case, the piezoelectric and electromechanical coupling coefficients are odd functions of the bias field and have a linear dependence on the bias field. The relative changes of ultrasonic velocity are found to have a quadratic dependence on the bias DC field. In bias fields of about 20 kV/m, the values of square of electromechanical coupling coefficient could be high enough (>20%) for longitudinal vibrations in thin plates of investigated CuInP2(S,Se)6 materials in the paraelectric phase. In the ferroelectric phase, the external DC electric field acts as polarizing field and electromechanical coupling coefficients sufficiently increase. At the transitions, the piezoelectric anomalies have been observed.

scholarly journals Simulation Analysis of Bionic Robot Fish Based on MFC Materials

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Chengguang Zhang
Keyword(s):  
Smart Materials ◽  
Electromechanical Coupling ◽  
Mechanical Load ◽  
Fiber Composite ◽  
Smart Material ◽  
Robotic Fish ◽  
Electromechanical Coupling Coefficient ◽  
Control Analysis ◽  
Underwater Robots ◽  
New Type

With the development of marine resources, research on underwater robots has received unprecedented attention. The discovery and application of new smart materials provide new ideas for the research of underwater robots, which can overcome the issues of traditional underwater robots and optimize their design. A macro fiber composite (MFC) is a new type of piezoelectric fiber composite that combines actuators and sensors. The material has excellent deflection, good flexibility, and a high electromechanical coupling coefficient. Bionic mechatronics design is an effective way to innovate mechatronics in the future and can significantly improve mechatronics system performance. As an important issue for the design of bionic mechatronics, it is necessary to make robots as soft as natural organisms to achieve similar biological movement with both higher efficiency and performance. Compared with traditional rigid robots, the design and control of a soft robotic fish are difficult because the coupling between the flexible structure and the surrounding environment should be considered, which is difficult to solve due to the large deformation and coupling dynamics. In this paper, an MFC smart material is applied as an actuator in the design of bionic robotic fish. Combined with the piezoelectric constitutive and elastic constitutive equations of the MFC material, the voltage-drive signal is converted to a mechanical load applied to the MFC actuator, which makes the MFC material deform and drives the movement of the robotic fish. The characteristics of caudal fin motion during the swimming process of the bionic robotic fish were analyzed by an acoustic-solid coupling analysis method. The motion control analysis of the bionic robotic fish was carried out by changing the applied driving signal. Through numerical analysis, a new type of soft robotic fish was designed, and the feasibility of using an MFC smart material for underwater bionic robotic fish actuators was verified. The new soft robotic fish was successfully developed to achieve high performance.

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