Piezoelectric Transducer 3D Oscillation Coupling
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Solution Overview
Problem
Existing electroacoustic transducers face limitations in increasing the coupling factor, which affects the efficiency of energy conversion between electrical and mechanical energy, leading to reduced bandwidth.
Innovation Solution
The transducer incorporates a piezoelectric layer structured to excite oscillations in three spatial directions when an alternating electric field is applied, utilizing multiple components of the piezo-tensor for enhanced coupling, including longitudinal and shear oscillations, and features such as planar layers with holes and/or slots to optimize oscillation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a one-dimensional oscillation mode is used in the piezoelectric layer, then the device complexity is low, but the coupling factor is limited
Solution Approach 1:
The patent transitions from one-dimensional oscillation modes to three-dimensional oscillation modes in the piezoelectric layer. By exciting oscillations in three spatial directions (x, y, and z directions) instead of a single direction, the patent utilizes multiple components of the piezo-tensor (up to six elements) to achieve a higher coupling factor while maintaining reasonable device complexity.
2Manufacturing precision
If only one element of the piezo-tensor is utilized, then the manufacturing precision requirement is low, but the coupling factor is reduced
Solution Approach 1:
The patent makes the piezoelectric layer perform multiple functions by utilizing multiple elements of the piezo-tensor simultaneously. The three-dimensional oscillation mode enables the piezoelectric layer to engage up to six different piezo-tensor elements (three for longitudinal oscillations and three for shear oscillations), thereby increasing the coupling factor without significantly increasing manufacturing precision requirements.
3Reliability
If a two-dimensional oscillation mode is used, then the coupling factor is increased compared to one-dimensional mode, but the bandwidth is still limited
Solution Approach 1:
The patent extends from two-dimensional to three-dimensional oscillation modes to further increase the coupling factor and bandwidth. By incorporating oscillations in all three spatial directions, the patent maximizes the utilization of piezo-tensor components, achieving a coupling factor increase to at least 10% and enabling broader bandwidth performance for applications such as filters, duplexers, and resonators.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly increases the coupling factor, enabling broader bandwidth and improved performance in applications like filters, sensors, and resonators, while minimizing disturbance modes and temperature sensitivity.
Implementation Method 1
an electroacoustic transducer having a piezoelectric layer which piezoelectric layer is structured in such a way that, in the case of an alternating electric field applied in one spatial direction, an oscillation mode with oscillations in three spatial directions is excited
Data Source
AI summary
An electroacoustic transducer has a piezoelectric layer, which is structured in such a way that, in the case of an alternating electric field applied in one spatial direction, an oscillation mode with oscillations in three spatial directions is excited.