Two-dimensional high-performance resonator
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Solution Overview
Problem
Existing resonator technologies face challenges in achieving high electromechanical coupling coefficients and quality factors, especially at high frequencies, which limits their performance in meeting the demands of advanced RF filters required for 5G standards, and they struggle with spurious mode elimination.
Innovation Solution
A two-dimensional high-performance resonator design featuring a piezoelectric layer with electrodes arranged in a specific configuration, including a bridge structure that connects adjacent electrodes, generating multi-directional electric fields to enhance electromechanical coupling, and using materials like lithium niobate or aluminum nitride to achieve high resonance frequencies and coupling coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional one-dimensional Lamb wave resonator structure is used, then the resonator can be manufactured with simple process, but the electromechanical coupling coefficient and quality factor are limited and cannot meet high-performance requirements
Solution Approach 1:
The patent transitions from conventional one-dimensional interdigital transducer structures to two-dimensional electrode arrangements. The electrodes are positioned at specific distances (greater than four wavelengths) and connected via bridge structures, creating multi-directional electric fields that couple with the piezoelectric layer in multiple dimensions. This dimensional expansion enables significantly higher electromechanical coupling coefficients while maintaining manufacturability through standard lithography processes.
2Reliability
If electrode distance is reduced to increase coupling, then electromechanical coupling improves, but spurious modes are generated that degrade performance
Solution Approach 1:
The patent implements non-uniform electrode positioning with specific local characteristics. Electrons are arranged at distances greater than four wavelengths from each other, and bridge structures connect specific electrode pairs rather than all electrodes uniformly. This localized structural quality control creates electric field distributions that enhance coupling in desired directions while suppressing spurious mode generation, achieving high performance without the harmful side effects of uniform close-spaced electrode arrangements.
3Speed
If high frequency operation is implemented, then bandwidth requirements are met, but phase velocity limitations and lithography constraints prevent maintaining excellent performance
Solution Approach 1:
The patent employs composite material structures combining piezoelectric layers (such as lithium niobate or aluminum nitride) with metal electrode materials. This composite approach enables high-frequency operation by leveraging the superior acoustic properties of the piezoelectric materials while the metal electrodes provide the necessary electrical coupling. The two-dimensional electrode configuration further enhances the electromechanical coupling coefficient, allowing excellent performance to be maintained at high frequencies where conventional structures fail.
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
The design achieves an ultra-high frequency of 6 GHz with an electromechanical coupling coefficient greater than 40% and significantly improved quality factor, effectively meeting the requirements of 5G technology by reducing spurious modes and enhancing filter performance.
Implementation Method 1
a piezoelectric layer, wherein an electrode layer is distributed on an upper surface of the piezoelectric layer
Implementation Method 2
a bridge structure is arranged on an upper portion of the electrode layer... generating multi-directional electric fields to enhance electromechanical coupling
Data Source
AI summary
The disclosure discloses a two-dimensional high-performance resonator, which is specifically an ultra-high-frequency resonator structure capable of improving an electromechanical coupling coefficient of the resonator. The resonator includes a piezoelectric layer, where an electrode layer is distributed on the upper surface of the piezoelectric layer, the electrode layer includes a plurality of electrodes arranged in a horizontal direction with a distance therebetween greater than four wavelengths, and a bridge structure is arranged on an upper portion of the electrode layer. The resonator structure can effectively improve the resonance frequency and the electromechanical coupling coefficient of the resonator, and can meet the requirements of the 5G market, and the quality factor is greatly improved.