Piezoelectric Resonator Combined Thickness Width Modes
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Solution Overview
Problem
Current piezoelectric resonators either rely on thickness vibrational modes for high electromechanical coupling but lack design flexibility for multiple frequencies, or use width vibrational modes for flexibility but with low coupling efficiency, without combining both effectively.
Innovation Solution
Piezoelectric resonators are designed to simultaneously utilize both thickness and width vibrational modes, achieving a coherent combination that enhances electromechanical coupling while maintaining single-chip multiple frequency capability by optimizing the thickness to width ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thickness vibrational mode is used, then electromechanical coupling coefficient is improved, but design flexibility for multiple frequencies is lost
Solution Approach 1:
The patent combines thickness vibrational mode and width vibrational mode in a single resonator device. The resonator structure includes a piezoelectric layer where both thickness-mode vibrations (providing high electromechanical coupling) and width-mode vibrations (providing design flexibility) occur simultaneously, merging the advantages of both modes into one integrated solution.
Solution Approach 2:
The resonator is designed to perform multiple functions simultaneously: it generates both thickness-mode and width-mode vibrational modes within the same device, enabling it to achieve both high electromechanical coupling and multiple frequency operation capabilities that were previously available only through separate resonator designs.
2Adaptability or versatility
If width vibrational mode is used, then design flexibility for multiple frequencies is improved, but electromechanical coupling coefficient deteriorates
Solution Approach 1:
The patent merges width vibrational mode (which provides design flexibility) with thickness vibrational mode (which provides high electromechanical coupling). The combined mode operation allows the resonator to achieve both design flexibility and high coupling efficiency that were previously contradictory.
Solution Approach 2:
The resonator employs a composite structure involving a piezoelectric layer combined with electrode patterns that enable both width-mode and thickness-mode vibrations. This composite approach allows the system to leverage the beneficial properties of both vibrational modes simultaneously.
3Reliability
If thickness-only vibrational mode resonator is used, then electromechanical coupling is high, but multiple frequency operation on single wafer is lost
Solution Approach 1:
The resonator combines thickness-mode and width-mode vibrational characteristics in a single device structure. This merging enables the resonator to maintain high electromechanical coupling from thickness-mode while simultaneously achieving multiple frequency operation capability through width-mode, resolving the productivity limitation.
Solution Approach 2:
The resonator design allows dynamic operation across multiple frequencies by utilizing the width dimension for frequency tuning while maintaining the thickness-mode coupling efficiency. The structure can be configured to operate at different frequencies by adjusting width-related parameters without sacrificing electromechanical coupling.
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 increases the electromechanical coupling coefficient beyond what is achievable with width-only modes while allowing for multiple frequency operation in a single device, improving efficiency and design flexibility.
Implementation Method 1
Piezoelectric resonators may be thought of as solid state transducers which can convert mechanical energy into electrical energy and electrical energy back into mechanical energy
Implementation Method 2
Piezoelectric resonators may be thought of as solid state transducers which can convert mechanical energy into electrical energy and electrical energy back into mechanical energy
Implementation Method 3
the thickness dimension and a width dimension of the piezoelectric substrate are configured to produce a resonance from a coherent combination of a thickness vibrational mode and a width vibrational mode
Data Source
AI summary
A method and apparatus for a piezoelectric resonator having combined thickness and width vibrational modes are disclosed. A piezoelectric resonator may include a piezoelectric substrate and a first electrode coupled to a first surface of the piezoelectric substrate. The piezoelectric resonator may further include a second electrode coupled to a second surface of the piezoelectric substrate, where the first surface and the second surface are substantially parallel and define a thickness dimension of the piezoelectric substrate. Furthermore, the thickness dimension and the width dimension of the piezoelectric substrate are configured to produce a resonance from a coherent combination of a thickness vibrational mode and a width vibrational mode when an excitation signal is applied to the electrodes.