Results 201 to 210 of about 439 (222)
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Materials Research Innovations, 2014
In this paper, the finite element method was employed to study the electrode influence on the effective electromechanical coupling coefficient of thin film bulk acoustic resonators (FBARs). A three-dimensional FBAR model was built to characterise the resonator behaviour. The calculation results revealed that the electrode properties including electrode
R. Zhang +4 more
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In this paper, the finite element method was employed to study the electrode influence on the effective electromechanical coupling coefficient of thin film bulk acoustic resonators (FBARs). A three-dimensional FBAR model was built to characterise the resonator behaviour. The calculation results revealed that the electrode properties including electrode
R. Zhang +4 more
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Integrated Ferroelectrics, 2016
ABSTRACTIn this work, two coupled Artificial Neural Networks (ANNs) were proposed to determine the first two higher-order resonant frequencies in radial vibrational modes and their associate effective electromechanical coupling coefficient (keff) of the ring-shaped piezoelectric transformer.
Chumpol Supatutkul +1 more
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ABSTRACTIn this work, two coupled Artificial Neural Networks (ANNs) were proposed to determine the first two higher-order resonant frequencies in radial vibrational modes and their associate effective electromechanical coupling coefficient (keff) of the ring-shaped piezoelectric transformer.
Chumpol Supatutkul +1 more
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Advanced technologies of FBAR for tuning effective electromechanical coupling coefficient
Applied Physics LettersThe film bulk acoustic wave resonator (FBAR) is one of the most popular devices in the radio frequency field. Numerous researchers are simultaneously working to develop an effective electromechanical coupling coefficient (keff2) tuning technology, aiming to meet the diverse bandwidth requirements of the 5 G era.
Yuanhang Qu +12 more
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Proceedings of the 2004 IEEE International Frequency Control Symposium and Exposition, 2004., 2005
The input electric impedance, Z/sub /spl omega//, for a three-layer (electrode/piezoelectric film/electrode) and a four layer (electrode/piezoelectric film/electrode/substrate) thin film bulk acoustic wave resonator, is derived by a one-dimensional transfer matrix method to describe the thin film resonator behavior, especially the effect of electrode ...
null Qingming Chen +2 more
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The input electric impedance, Z/sub /spl omega//, for a three-layer (electrode/piezoelectric film/electrode) and a four layer (electrode/piezoelectric film/electrode/substrate) thin film bulk acoustic wave resonator, is derived by a one-dimensional transfer matrix method to describe the thin film resonator behavior, especially the effect of electrode ...
null Qingming Chen +2 more
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International Applied Mechanics, 1992
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Ultrasonics, 2000
An approximate formula has been developed to determine the electromechanical coupling coefficient of the piezoelectric film in a four-layer composite resonator, which includes two electrodes. In this formula, the coupling coefficient can be calculated from the distribution of the effective coupling coefficients, k2eff, which are given by the modal ...
, Zhang, , Wang, , Cheeke
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An approximate formula has been developed to determine the electromechanical coupling coefficient of the piezoelectric film in a four-layer composite resonator, which includes two electrodes. In this formula, the coupling coefficient can be calculated from the distribution of the effective coupling coefficients, k2eff, which are given by the modal ...
, Zhang, , Wang, , Cheeke
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Advanced Materials Research, 2012
Electromechanical coupling coefficient of cement-based piezoelectric composites affected by pozzolanic materials and poling field are investigated. Specimens, through a pressure approach, are manufactured by combining PZT powders and cement-based binder with the same volume fraction.
Dung Hung Lin +3 more
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Electromechanical coupling coefficient of cement-based piezoelectric composites affected by pozzolanic materials and poling field are investigated. Specimens, through a pressure approach, are manufactured by combining PZT powders and cement-based binder with the same volume fraction.
Dung Hung Lin +3 more
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Ferroelectrics Letters Section, 2009
PZT-cement composites were produced using PZT ceramic of different particle size (3.8 μ m to 620 μ m). The effect of PZT particle size on the electromechanical coupling coefficient (Kt) of the composites was then investigated. The results showed that the particle size of PZT used to produce the composite has a noticeable effect on the Kt values.
A. CHAIPANICH, N. JAITANONG
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PZT-cement composites were produced using PZT ceramic of different particle size (3.8 μ m to 620 μ m). The effect of PZT particle size on the electromechanical coupling coefficient (Kt) of the composites was then investigated. The results showed that the particle size of PZT used to produce the composite has a noticeable effect on the Kt values.
A. CHAIPANICH, N. JAITANONG
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The European Physical Journal Plus, 2019
The electromechanical coupling factor (K2) presents a key parameter in acoustic devices that reflects the influence of piezoelectricity on the phase velocity of elastic waves. The higher this coefficient, the stronger the dependence of the characteristics of wave propagation on the electric-system parameters.
Cherif Othmani +3 more
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The electromechanical coupling factor (K2) presents a key parameter in acoustic devices that reflects the influence of piezoelectricity on the phase velocity of elastic waves. The higher this coefficient, the stronger the dependence of the characteristics of wave propagation on the electric-system parameters.
Cherif Othmani +3 more
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Smart Structures and Systems, 2014
This paper presents a linear computational homogenization framework to evaluate the effective (or generalized) electromechanical coupling coefficient (EMCC) of adaptive structures with piezoelectric structural fiber (PSF) composite elements. The PSF consists of a silicon carbide (SiC) or carbon core fiber as reinforcement to a fragile piezo-ceramic ...
Yao Koutsawa +3 more
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This paper presents a linear computational homogenization framework to evaluate the effective (or generalized) electromechanical coupling coefficient (EMCC) of adaptive structures with piezoelectric structural fiber (PSF) composite elements. The PSF consists of a silicon carbide (SiC) or carbon core fiber as reinforcement to a fragile piezo-ceramic ...
Yao Koutsawa +3 more
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