SAW Resonator IDT Layout for Higher Q Without Material Changes
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Solution Overview
Problem
Existing SAW resonators face challenges in achieving high quality factors without increasing costs by altering materials or processes, which is necessary for improving selectivity and reducing insertion loss in RF filters for mobile communication devices.
Innovation Solution
Modulating the structure of the IDT electrode in SAW resonators by adjusting input and output finger metallization and period length to optimize the quality factor without changing the material or manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piezoelectric material of the piezoelectric substrate, the crystal orientation of the piezoelectric material, or the process is changed to improve the quality factor of the SAW resonator, then the quality factor is improved, but the price of the SAW resonator is increased
Solution Approach 1:
The patent changes the geometric parameters of the IDT electrode structure, specifically the finger width, spacing, and arrangement pattern, to optimize the quality factor without changing the piezoelectric material or crystal orientation. This allows performance improvement while maintaining existing manufacturing processes and cost structures
Solution Approach 2:
The IDT electrode is divided into multiple fingers with specific spacing arrangements. By segmenting the electrode structure and optimizing the individual finger dimensions and gaps, the patent achieves improved quality factor through structural optimization rather than material changes
2Reliability
If the structure of the IDT electrode is changed to modulate the surface acoustic wave, then the quality factor can be optimized, but the device complexity increases
Solution Approach 1:
The patent applies different finger widths and spacing configurations to specific regions of the IDT electrode. By optimizing local structural characteristics rather than uniformly changing the entire electrode, the patent achieves quality factor improvement with minimal increase in overall device 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
Improves the quality factor of SAW resonators and filters, achieving low insertion loss and enhanced frequency characteristics.
Implementation Method 1
a surface acoustic wave resonator (hereinafter referred to as a 'SAW resonator') or a surface acoustic wave filter (hereinafter referred to as a 'SAW filter') capable of converting an electrical signal into a surface acoustic wave (SAW) of a piezoelectric material using the piezoelectric effect of the piezoelectric material and converting the converted surface acoustic wave (SAW) back into an electrical signal
Implementation Method 2
an acoustic filter using a surface acoustic wave (SAW) or a bulk acoustic wave (BAW)
Data Source
AI summary
The present invention relates to a SAW resonator design method, a SAW filter and a design method therefor, and a computing device-readable recording medium having same recorded thereon, which may improve a quality factor of the SAW resonator by designing a structure, such as an input IDT finger, an output IDT finger, and an interval between fingers in an IDT electrode of the SAW resonator under optimal conditions without changing a material of the SAW resonator or changing a manufacturing process, and may obtain reduced insertion loss and improved frequency characteristics by configuring the SAW filter by using the SAW resonator described above.