Results 191 to 200 of about 439 (222)

ScAlN/AlN Film-Based Lamé Mode Resonator With High Effective Electromechanical Coupling Coefficient

Journal of Microelectromechanical Systems, 2021
The effective electromechanical coupling coefficient ( ${K}_{eff}^{2}{)}$ of resonators is crucial for application in radio communication such as fabricating bandpass filters. In this letter, we present a $0^{\text {th}}$ symmetry ( ${S}_{0}{)}$ mode Lame mode resonator (LMR) operating at 2.563 GHz with a high ${K}_{\vphantom {D_{j}}{
Jie Zhou, Yan Liu, Qinwen Xu, Ying Xie, Yao Cai, Jieyu Liu, Wenjuan Liu, Alexander Tovstopyat, Chengliang Sun   +8 more
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Effects of specimen shape on the measurement of the electromechanical coupling coefficient in inclined electrodes

Electronics and Communications in Japan (Part II: Electronics), 1996
AbstractThe electromechanical coupling coefficient k can be determined by measuring the frequency characteristics of admittance. However, it is known that the specimen shape affects the measurement of the admittance frequency characteristics. In this paper, the finite element method was employed to investigate the effects of sample electrode ...
Yutaka Adachi, Tadashi Takenaka
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On the optimizing of the effective electromechanical coupling coefficients of piezoceramic bodies

The Journal of the Acoustical Society of America, 1998
The effective electromechanical coupling coefficients are defined based on the expression for internal energy of a piezoceramic body. By means of this definition, conditions are obtained under which an effective coupling coefficient for any given deformation distribution can be maximized and shown to be equal to a corresponding coupling coefficient of ...
Boris Aronov, David A. Brown
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Incredible negative values of effective electromechanical coupling coefficient for surface acoustic waves in piezoelectrics

Ultrasonics, 2000
The extraordinary case of increase in velocity of surface acoustic waves (SAW) caused by electrical shorting of the surface of the superstrong piezoelectric crystal potassium niobate, KNbO3, is numerically found. The explanation of this effect is based on considering SAWs as coupled Rayleigh and Bleustein-Gulyaev modes.
V G, Mozhaev, M, Weihnacht
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Effect of kerf filler on the electromechanical coupling coefficient of 1–3 piezoelectric composites

Journal of Alloys and Compounds, 2015
Abstract A unified formula has been derived to quantitatively describe the electromechanical coupling factor for the thickness mode of 1–3 piezoelectric composites with rectangular rod. The effect of different kerf filler on the electromechanical coupling factor is analyzed by varying the aspect ratio of piezoelectric rod and the elastic stiffness of
Chunying Wang, Yingchun Liu, Rui Zhang, Wenwu Cao   +3 more
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Effect of kerf filler on the electromechanical coupling coefficient of an ultrasonic transducer array element

Applied Physics Letters, 2007
Electromechanical coupling coefficient directly reflects the electromechanical energy conversion capability of a piezoelectric device. We show theoretically that the kerf filler in the ultrasonic array transducer can degrade this coupling coefficient.
Jungsoon Kim, Moojoon Kim, Wenwu Cao
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Damage indication in smart structures using modal effective electromechanical coupling coefficients

Smart Materials and Structures, 2008
This work explores the use, in structural health monitoring, of the so-called modal effective electromechanical coupling coefficient (EMCC) as a damage indicator for structures with failures such as cracks. For this purpose, a discrete layered finite element (FE) model for smart beams is proposed and applied to short-circuit (SC) and open-circuit (OC ...
M A Al-Ajmi, A Benjeddou
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On the optimization of the effective electromechanical coupling coefficients of a piezoelectric body

The Journal of the Acoustical Society of America, 2003
Effective electromechanical coupling coefficients are defined based on the expression for the internal energy of a piezoelectric body [B. S. Aronov, “Energy analysis of a piezoelectric body under nonuniform deformation,” J. Acoust. Soc. Am. 113, 2638–2646 (2003)].
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Influence of electrodes on the effective electromechanical coupling coefficient distributions of high-overtone bulk acoustic resonator

Ultrasonics, 2015
In this paper, the influence of the electrodes on effective electromechanical coupling coefficient k(2)eff distribution of high-overtone bulk acoustic resonators (HBAR) is investigated using the four-layer thickness extension mode composite resonator model.
Mengwei, Liu, Jian, Li, Chenghao, Wang, Junhong, Li, Jun, Ma   +4 more
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Crystallographic characteristics and effective electromechanical coupling coefficients of AlN thin films for FBAR applications

IEEE Symposium on Ultrasonics, 2003, 2004
In this study, AlN thin films for film bulk acoustic wave resonator (FBAR) device applications were investigated using facing targets sputtering system (FTS) and a DC power supply. The crystallographic characteristics, c-axis preferred orientations, and effective electromechanical coupling coefficients (K/sub 2//sup eff/) of such AlN thin films were ...
G.H. Kim, M.J. Keum, H.I. Seo, D.S. Park, J.B. Lee, K.R. Kim   +5 more
openaire   +1 more source