Effect of the Matching Circuit on the Electromechanical Characteristics of Sandwiched Piezoelectric Transducers

Abstract

The input electrical impedance behaves as a capacitive when a piezoelectric transducer is excited near its resonance frequency. In order to increase the energy transmission efficiency, a series or parallel inductor should be used to compensate the capacitive impedance of the piezoelectric transducer. In this paper, the effect of the series matching inductor on the electromechanical characteristics of the piezoelectric transducer is analyzed. The dependency of the resonance/anti-resonance frequency, the effective electromechanical coupling coefficient, the electrical quality factor and the electro-acoustical efficiency on the matching inductor is obtained. It is shown that apart from compensating the capacitive impedance of the piezoelectric transducer, the series matching inductor can also change the electromechanical characteristics of the piezoelectric transducer. When series matching inductor is increased, the resonance frequency is decreased and the anti-resonance unchanged; the effective electromechanical coupling coefficient is increased. For the electrical quality factor and the electroacoustic efficiency, the dependency on the matching inductor is different when the transducer is operated at the resonance and the anti-resonance frequency. The electromechanical characteristics of the piezoelectric transducer with series matching inductor are measured. It is shown that the theoretically predicted relationship between the electromechanical characteristics and the series matching inductor is in good agreement with the experimental results.

A Review of Electric Impedance Matching Techniques for Piezoelectric Sensors, Actuators and Transducers

“…Lin and Xu [148] presented a detailed study discussing the effect of series matching inductor on the resonance or anti-resonance frequency, electromechanical coupling coefficient, electrical quality factor and electro-acoustic efficiency. Lee et al [149] used a series capacitor and a shunt inductor to match the electric impedance of dual-frequency oblong-shaped-focused transducers used for imaging intravascular tissue.…”

ePave: A Self-Powered Wireless Sensor for Smart and Autonomous Pavement

“…Lin and Xu [ 43 ] analyzed the effect of series matching inductance on the electromechanical properties of piezoelectric transducers. When the series matching inductor is increased, the resonance frequency is decreased, the anti-resonance unchanged, the effective electromechanical coupling coefficient is increased.…”

Antiresonance and Stabilization in Spatio‐Temporal Dynamics of a Periodically Driven Gray‐Scott Reaction‐Diffusion System

“…First, the phenomenon of antiresonance is well known in coupled systems with additive force and arises due to interference between the coupling and the drive over an appropriate frequency range. This has been observed in coupled quantum oscillators, [41,42] atom-cavity interaction, [43] coupled quantum dot, [44] electrical circuits, [45,46] wave traps in radio-receiver, [47,48] and in manyother cases [49][50][51][52][53][54][55] including Fano antiresonance in plasmon-exciton hybrid systems. [57] Theantiresonance in present case, however, is realized in a single dynamical system driven bya multiplicative periodic forcing and owes its origin to the destructive interference betweentwo oscillations, one due to direct transition and the other due to parametric transition.…”

“…The two transitions may interfere destructively and give rise to antiresonance [25,[41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] response to the parametric drive when its frequency is varied. This is reminiscent of Fano resonance [57,58] in atomic and optical physics, which is a wellknown quantum mechanical interference effect due to two excitation processes first observed in the photo-ionization spectra of noble gases.…”