A method of "weak resonance" for quality factor and coupling coefficient measurement in piezoelectrics

2005 ◽  
Vol 52 (11) ◽  
pp. 2120-2130 ◽  
Author(s):  
A.V. Mezheritsky
Keyword(s):  
Quality Factor ◽  
Coupling Coefficient ◽  
Coefficient Measurement ◽  
Weak Resonance

scholarly journals Coupling Coefficient Measurement Method with Simple Procedures Using a Two-Port Network Analyzer for a Multi-Coil WPT System

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3950
Author(s):  
Seon-Jae Jeon ◽  
Dong-Wook Seo
Keyword(s):  
Coupling Coefficient ◽  
Measurement Method ◽  
Simple Procedure ◽  
Measurement Procedure ◽  
Network Analyzer ◽  
Wireless Power ◽  
S Parameter ◽  
Coefficient Measurement ◽  
Simple Measurement ◽  
Definition Of

In this paper, we propose a measurement method with a simple procedure based on the definition of the impedance parameter using a two-port network analyzer. The main advantage of the proposed measurement method is that there is no limit on the number of measuring coils, and the method has a simple measurement procedure. To verify the proposed method, we measured the coupling coefficient among three coils with respect to the distance between the two farthest coils at 6.78 and 13.56 MHz, which are frequencies most common for a wireless power transfer (WPT) system in high-frequency band. As a result, the proposed method showed good agreement with results of the conventional S-parameter measurement methods.

Efficiency Characterization of Piezoelectrics for Power

2004 ◽  
Author(s):  
J. H. Cho ◽  
J. C. Raupp ◽  
P. D. Hayenga ◽  
R. F. Richards ◽  
D. F. Bahr ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Quality Factor ◽  
Coupling Coefficient ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Coefficient ◽  
Piezoelectric Cantilever ◽  
Quality Factor Q ◽  
Piezoelectric Devices

The efficiency of energy conversion by piezoelectric devices depends upon the quality factor Q, and electromechanical coupling coefficient k2. Efficiency, Q, and k2 were measured for a piezoelectric cantilever and piezoelectric stack, and compared to a model of the efficiency in terms of Q and k2. The model and experiment agree very well.

A novel two-port network model for RCPT system

2013 ◽  
Vol 33 (1/2) ◽  
pp. 157-166 ◽  
Author(s):  
Zhang Xian ◽  
Yang Qingxin ◽  
Chen Haiyan ◽  
Zhang Xin ◽  
Jin Liang ◽  
...  
Keyword(s):  
Quality Factor ◽  
Network Model ◽  
Coupling Coefficient ◽  
System Performance ◽  
Design Methodology ◽  
Power Transmission ◽  
Physical Parameters ◽  
Transmission Experiment ◽  
Content Type ◽  
Leakage Inductance

Purpose – The purpose of the paper is to show that how a contactless power transmission system via electromagnetic (EM) resonantly coupling power transmission (RCPT) technology may be analyzed in-depth by using a detailed T-type two-port network model with leakage inductance variable. Design/methodology/approach – Through the introduction of coupling coefficient and quality factor, the influence of different physical parameters on the system performance is taken into consideration and validated by power transmission experiment. Findings – It is shown that system performance is mainly subject to coupling coefficient and quality factor from the two-port network model in this paper. Moreover, there are three working status of dynamic transmission, which are over coupling, critical coupling and under coupling. Originality/value – Two-port network model applied to practical RCPT system design considering impedance loss on resonators, etc.

scholarly journals Modeling and Structure Optimization of Tapped Transformer

2017 ◽  
Vol 7 (1) ◽  
pp. 41
Author(s):  
Abdelhadi Namoune ◽  
Azzedine Hamid ◽  
Rachid Taleb
Keyword(s):  
Quality Factor ◽  
Coupling Coefficient ◽  
Structure Optimization ◽  
Circuit Model ◽  
Primary Coil ◽  
Physical Understanding ◽  
Good Agreement

In this paper, a simplified circuit model of the tapped transformer structure has been presented to extract the Geometric and technology parameters and offer better physical understanding. Moreover, the structure of planar transformer has been optimized by using changing the width and space of the primary coil, so as to enlarge the quality factor <em>Q</em> and high coupling coefficient <em>K</em>. To verify the results obtained by using these models, we have compared them with the results obtained by employing the MATLAB simulator. Very good agreement has been recorded for the effective primary inductance value, whereas the effective primary quality factor value has shown a somewhat larger deviation than the inductance.

Accurate Determinatuon of Microwave Conductivity by Means of Cavity Coupling Coefficient Measurement

1975 ◽  
Vol 14 (6) ◽  
pp. 909-910 ◽  
Author(s):  
Kenzo Watanabe ◽  
Mitsuaki Ashiki ◽  
Shizuo Mizushina ◽  
Iwao Takao
Keyword(s):  
Coupling Coefficient ◽  
Microwave Conductivity ◽  
Cavity Coupling ◽  
Coefficient Measurement
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