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Experimental Verification of the Unified Formula for Electromechanical Coupling Coefficient of Piezoelectric Resonators  

Kim, Jung-Soon (Department of Multimedia Engineering, Tongmyong University)
Kim, Moo-Joon (Department of Physics, Pukyong National University)
Ha, Kang-Lyeol (Department of Physics, Pukyong National University)
Cao, Wen-Wu (Materials Research Institute, the Pennsylvania State University)
Publication Information
The Journal of the Acoustical Society of Korea / v.25, no.3E, 2006 , pp. 110-114 More about this Journal
Abstract
In a previous theoretical paper, we have derived a unified formula by considering 2-D coupled mode vibrations. The unified formula for electromechanical coupling coefficient of piezoelectric resonator was verified experimentally. The capacitance change near the resonant frequency was investigated to estimate the effective coupling coefficient of the resonator instead of the conventional method based on I-D model. The susceptance spectra were measured for the seven samples of piezoelectric resonator with different aspect ratio. Excellent agreement between theoretical and experimental results was obtained.
Keywords
lectromechanical coupling coefficient; Coupled vibration; Aspect ratio; Piezoelectric ceramic resonator; Ultrasonic array transducer;
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