Elastic Wave Electrode Finger Profile for Higher Power Durability
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Solution Overview
Problem
Existing duplexers in communication devices face challenges in enhancing power durability, which affects the reliability and efficiency of signal filtering and transmission.
Innovation Solution
The design includes a piezoelectric substrate with an excitation electrode featuring electrode fingers that are wider at a first height than at a second height, connected in a ladder pattern with resonators, enhancing power durability by reducing vibration influence and propagation loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode fingers with uniform width are used, then manufacturing is simple, but power durability is insufficient due to vibration influence and propagation loss
Solution Approach 1:
The electrode finger width is varied locally along its length, being wider at the first height (远离基板表面) and narrower at the second height (靠近基板表面). This local quality variation reduces vibration influence and propagation loss in specific regions, thereby improving power durability without requiring complete structural redesign
Solution Approach 2:
The electrode finger cross-section is designed with asymmetric width distribution at different heights. This asymmetric configuration optimizes the distribution of mechanical stress and vibration energy, reducing propagation loss and enhancing the overall power durability of the elastic wave element
2Reliability
If electrode fingers are made wider at the first height than at the second height, then vibration influence and propagation loss are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The electrode finger dimensions are optimized by changing the width parameter at different heights. Specifically, the width at the first height is set to be greater than the width at the second height, creating a gradient structure that reduces vibration influence and propagation loss while maintaining manufacturability through controlled parameter variation
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 power durability by reducing vibration impact and propagation loss, leading to improved reliability and efficiency in signal filtering and transmission.
Implementation Method 1
The elastic wave element utilizes a characteristic that an electric signal and a surface acoustic wave can be converted to each other in accordance with a relationship between the excitation electrode and the piezoelectric substrate
Implementation Method 2
an electric signal and a surface acoustic wave can be converted to each other
Data Source
AI summary
An elastic wave element having a piezoelectric substrate equipped with a first main surface, and an excitation electrode arranged on the first main surface and having multiple electrode fingers, wherein, in a cross-sectional view in the direction orthogonal to the first main surface, the width of the electrode fingers at a first height at a distance from the first main surface is greater than the width at a second height located closest to the first main surface.