Single-Anchor Resonator Structure for Lower Anchor Loss
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Solution Overview
Problem
Existing mechanical resonators suffer from high anchor loss, which degrades their quality factor, makes it dependent on substrate boundary conditions and stress, and introduces repeatability and hysteresis issues.
Innovation Solution
The mechanical resonator design includes two identical plates with a decoupling structure and a central anchor, featuring first and second connectors connecting the plates and rings, minimizing anchor loss by canceling acoustic energy leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional anchor structures are used in mechanical resonators, then the device complexity is low, but the quality factor is degraded due to high anchor loss
Solution Approach 1:
The resonator structure is divided into two identical plates separated by a decoupling structure, with each plate connected to the decoupling structure independently. This segmentation allows the acoustic energy leakage from each plate to be managed separately and cancel out at the anchor point, reducing anchor loss while maintaining a manageable structural complexity through modular design
Solution Approach 2:
A decoupling structure is introduced as an intermediary element between the two identical plates and the anchor. This decoupling structure comprises connectors and rings that mechanically couple the plates to the anchor while decoupling the acoustic energy paths, allowing the acoustic leakage to cancel out without requiring direct rigid connection, thus reducing anchor loss with moderate structural complexity
2Reliability
If traditional resonator designs are used, then the manufacturing process is simple, but the quality factor becomes dependent on substrate boundary conditions and stress
Solution Approach 1:
While the overall structure maintains symmetry with two identical plates, the decoupling structure introduces an asymmetric acoustic path configuration where the connectors and rings create different mechanical coupling paths that converge at the central anchor. This controlled asymmetry in the acoustic path geometry enables the acoustic energy leakage to cancel out, making the quality factor independent of substrate boundary conditions and stress
Solution Approach 2:
The decoupling structure extracts and isolates the acoustic energy leakage paths from the main resonator body. By separating the acoustic energy management function into the decoupling structure with its specific connector and ring geometry, the quality factor becomes determined by the decoupling structure's acoustic cancellation mechanism rather than by substrate boundary conditions and stress
3Reliability
If conventional anchor designs are used, then the device is simple to fabricate, but repeatability and hysteresis issues occur
Solution Approach 1:
The anchor system is segmented into a decoupling structure with multiple connectors and rings rather than a single monolithic anchor. This segmentation creates multiple acoustic paths that converge at the central anchor point, enabling acoustic energy cancellation and eliminating the repeatability and hysteresis issues associated with conventional single-anchor designs while maintaining fabrication simplicity through standard lithographic patterns
Solution Approach 2:
The decoupling structure acts as an intermediary between the resonating plates and the final anchor point. This intermediary structure with its specific connector and ring geometry provides a controlled acoustic cancellation mechanism that eliminates hysteresis and improves repeatability, while the overall structure remains compatible with conventional fabrication processes
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
Reduces anchor loss, improving the resonator's quality factor and reducing susceptibility to substrate-dependent issues.
Implementation Method 1
As the resonator is vibrating, part of the acoustic energy leaks into the substrate and gets dissipated. The present disclosure provides the mechanical resonators designed to reduce the anchor losses during the BAW mode (e.g., Lamé mode)... minimize anchor loss by canceling acoustic energy leakage
Data Source
AI summary
A mechanical resonator includes two identical plates, and a decoupling structure comprising at least two first connectors, each first connector connecting the decoupling structure to a respective one of the two identical plates, and an anchor disposed at a center of the decoupling structure. Each of the two identical plates may be a square plate adapted to resonate in Lamé-mode. Further, each of the two identical plates may comprise a plurality of square plates, each square plate disposed next to one another. The decoupling structure further comprises a first ring connected to each of the two identical plates via a respective one of the at least two first connectors. The decoupling structure may further comprise a second ring connected to an inside of the first ring via at least two second connectors, wherein the anchor is disposed at a center of the second ring.