Acoustic Wave Electrode Protrusions to Reduce Energy Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional acoustic wave devices suffer from energy leakage due to manufacturing errors, leading to a degradation in quality factor.
Innovation Solution
An acoustic wave device is designed with a piezoelectric substrate and a transducer that includes a first electrode, a second electrode, and at least one first protrusion. The protrusions are formed at the ends of the electrodes and extend along the direction of the electrodes, partially obstructing the ends and reducing energy leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional acoustic wave devices are manufactured, then the device can be produced, but energy leakage occurs due to manufacturing errors resulting in degradation of quality factor
Solution Approach 1:
The patent applies preliminary anti-action by pre-compensating for manufacturing errors through optimized electrode design. The electrodes are designed with specific geometric parameters (width, spacing, length ratios) that preemptively counteract the effects of manufacturing tolerances, preventing energy leakage before it occurs during device operation
Solution Approach 2:
The patent employs parameter changes by optimizing specific geometric parameters of the electrodes (width w, spacing s, length L, and their ratios) to maximize energy confinement. By carefully selecting these parameters within acceptable manufacturing tolerances, the device achieves high quality factor despite inevitable manufacturing variations
2Reliability
If the transducer electrodes are designed with standard geometry, then fabrication is simplified, but energy leakage increases and quality factor degrades
Solution Approach 1:
The patent applies local quality by optimizing specific regions of the electrode structure (the interdigital pattern geometry) while keeping the overall device structure simple. The localized optimization of electrode width, spacing, and length ratios in the active region provides high quality factor without requiring complex modifications throughout the entire device
Solution Approach 2:
The patent uses partial action by focusing optimization efforts on the critical electrode regions that most influence energy confinement, rather than optimizing every aspect of the device. The electrode geometry is optimized to the extent necessary to achieve high quality factor while avoiding unnecessary complexity
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 enhances the quality factor of the acoustic wave device by reducing energy leakage, thereby improving the device's performance and efficiency.
Implementation Method 1
An acoustic wave device, such as a surface acoustic wave (SAW) device, may be used for the conversion and transmission of electrical and acoustic signals
Implementation Method 2
The transducer is disposed on the surface of the piezoelectric substrate, and includes a first electrode, a second electrode
Data Source
AI summary
An acoustic wave device includes a piezoelectric substrate and a transducer. The piezoelectric substrate has a surface. The transducer is disposed on the surface. The transducer includes a first electrode, a second electrode, and at least one protrusion. The first electrode extends along a first direction and has a first end. The second electrode extends along the first direction and has a second end. The first electrode and the second electrode are spaced apart from each other along a second direction. The at least one protrusion is disposed at the first end of the first electrode. The at least one protrusion extends along the first direction and partially obstruct the first end.