Lamb Wave Electrode Embedding to Reduce Spurious Components
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Solution Overview
Problem
Existing elastic wave devices using Lamb waves and piezoelectric bodies with embedded electrodes face challenges in reducing spurious components and achieving wider bandwidths.
Innovation Solution
The elastic wave device incorporates a piezoelectric body with a groove for embedding at least part of an IDT electrode, which includes electrode fingers located inside the groove, enhancing the device's performance by reducing spurious components and increasing bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an electrode is embedded in a piezoelectric body using conventional methods, then the device structure is formed, but spurious components are not sufficiently reduced and bandwidth is limited
Solution Approach 1:
The electrode is embedded in the piezoelectric body at different depths, creating a multi-level embedded structure. The IDT electrodes are positioned at a first depth while reflector electrodes are at a second depth, utilizing the depth dimension to control wave propagation and reduce spurious components while expanding bandwidth
Solution Approach 2:
Different regions of the piezoelectric body have different electrode configurations. The IDT region has electrodes at one depth level for signal generation, while the reflector region has electrodes at a different depth level for wave reflection, creating localized functional zones that collectively reduce spurious components and widen bandwidth
2Object-generated harmful factors
If the electrode configuration is modified to reduce spurious components, then harmful factors are reduced, but device complexity increases
Solution Approach 1:
The electrode system is segmented into distinct functional components: IDT electrodes for signal generation and reflector electrodes for wave reflection. These segments are positioned at different depths within the piezoelectric body, allowing independent optimization of each segment's function while collectively reducing spurious components
Solution Approach 2:
The electrodes are nested within the piezoelectric body at different depth levels, creating a layered embedded structure. This nesting approach allows multiple electrode layers to coexist within the same substrate volume, reducing spurious components through controlled interference while maintaining a compact device form factor
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 embedded electrode configuration effectively reduces spurious components and widens the bandwidth of the elastic wave device, improving its operational efficiency and performance.
Implementation Method 1
an elastic wave device uses a Lamb wave, including a piezoelectric body and an electrode
Data Source
AI summary
To reduce spurious components of an elastic wave device using a Lamb wave. In the elastic wave device using a Lamb wave, at least a part of an electrode is embedded in a piezoelectric body.