Acoustic Resonator Connection Electrode Thickness Symmetry
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Solution Overview
Problem
Existing bulk acoustic wave (BAW) resonators face challenges in minimizing resonance energy loss, which affects their performance and frequency band selection characteristics, particularly due to asymmetry caused by connection electrodes in typical designs.
Innovation Solution
The acoustic resonator design incorporates a connection electrode with a thickness less than that of the resonance part electrodes, along with a frame part that is symmetrically shaped and made of a different material, to reduce resonance energy loss and maintain symmetry, thereby improving the quality factor and frequency band selection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a connection electrode with the same thickness as resonance part electrodes is used, then electrical connection is ensured, but asymmetry is caused and resonance energy loss increases
Solution Approach 1:
The connection electrode is designed with a different thickness than the resonance part electrodes, creating local variation in electrode structure. Specifically, the connection electrode has a smaller thickness to maintain symmetry of the frame part while still providing adequate electrical connection functionality, thus reducing resonance energy loss without completely sacrificing connection performance
Solution Approach 2:
The patent intentionally introduces asymmetry in the electrode thickness distribution to achieve overall symmetry in the frame part structure. By making the connection electrode thinner than the resonance part electrodes, the frame part maintains its symmetrical configuration, which is crucial for minimizing resonance energy loss and improving device performance
2Reliability
If the connection electrode thickness is reduced, then symmetry of the frame part is maintained and resonance energy loss is reduced, but electrical connection capability may be compromised
Solution Approach 1:
The thickness parameter of the connection electrode is specifically optimized to be less than that of the resonance part electrodes. This parameter change maintains the symmetrical structure of the frame part while ensuring adequate electrical connection, thereby improving quality factor and frequency band selection characteristics without excessive manufacturing difficulty
Solution Approach 2:
The connection electrode thickness is reduced to a level that is sufficient for maintaining symmetry and reducing energy loss, but not excessively thin to compromise electrical connection. The thickness is optimized to provide just enough conductive capability while achieving the primary goal of structural symmetry
3Loss of energy
If a frame part with different material properties is used, then acoustic wave reflection is improved, but manufacturing complexity increases
Solution Approach 1:
The frame part is constructed with materials having specific acoustic reflection properties at the relevant location. By selecting materials with appropriate acoustic impedance for the frame part, acoustic waves are effectively reflected, reducing energy loss while the overall structural complexity remains manageable
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 configuration enhances the quality factor and reduces insertion loss and attenuation, leading to improved performance in frequency band selection and resonance energy confinement within the acoustic resonator.
Implementation Method 1
a resonance part mounted on the substrate and including resonance part electrodes, the resonance part being configured to generate acoustic waves
Implementation Method 2
a frame part disposed on at least one electrode among the resonance part electrodes, and being configured to reflect the acoustic waves
Data Source
AI summary
An acoustic resonator includes: a substrate; a resonance part mounted on the substrate and including resonance part electrodes, the resonance part being configured to generate acoustic waves; a cavity disposed between the resonance part and the substrate; a frame part disposed on at least one electrode among the resonance part electrodes, and being configured to reflect the acoustic waves; and a connection electrode configured to connect the at least one electrode to an external electrode, and having a thickness less than a thickness of the at least one electrode.