Reversed-Electrode Resonator Filter for Sharp Band Separation
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Solution Overview
Problem
Existing filter systems struggle to achieve a clear distinction between pass-band and stop-band in acoustic frequency bands, leading to suboptimal performance in signal filtering.
Innovation Solution
A filter system comprising at least two resonators with different resonant frequencies, where the resonators are electrically connected in a reversely connected-electrode structure, allowing for specific phase relationships that enhance filtering characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single resonator or conventional filter is used, then the structure is simple, but the transition region between pass-band and stop-band is wide and the bands are not clearly distinguished
Solution Approach 1:
The patent combines multiple resonators (first resonator and second resonator with different resonant frequencies) into a single filter system. The resonators are electrically connected in series between input and output terminals, creating a composite filtering structure that achieves sharp transition regions and clear band distinction through the synergistic effect of multiple resonant elements rather than through a single complex resonator design.
Solution Approach 2:
The filter system is segmented into multiple independent resonator units, each with specific resonant frequencies. The first resonator handles frequencies around its resonant frequency f1, while the second resonator handles frequencies around f2. This segmentation allows each resonator to be optimized for specific frequency ranges, creating well-defined pass-bands and stop-bands with narrow transition regions.
2Manufacturing precision
If multiple resonators with different resonant frequencies are used, then the transition region becomes narrow and bands are clearly distinguished, but the electrode connection structure becomes complex
Solution Approach 1:
The patent merges the electrode structures of multiple resonators into a shared configuration. The series connection of resonators creates a common electrode interface that simplifies the overall manufacturing process. The input terminal connects to the first resonator, which connects to the second resonator, which connects to the output terminal, creating a linear,易于制造的 connection topology.
3Manufacturing precision
If resonators are electrically connected in series, then the phase relationship creates sharp filtering characteristics, but the electrical connection complexity increases
Solution Approach 1:
The electrical connection is segmented into discrete, manageable stages: input terminal to first resonator, first resonator to second resonator, and second resonator to output terminal. This segmented approach to electrical connection simplifies the implementation of the series configuration and makes the phase relationship control more manageable compared to a monolithic complex connection structure.
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 proposed filter system achieves a sharp skirt characteristic with a narrow transition region and high signal maintenance between resonant frequencies, significantly improving filtering performance.
Implementation Method 1
The first sensor unit may include a first lower electrode, a first piezo-material layer, and a first upper electrode
Implementation Method 2
a first resonator having a first resonant frequency, and a second resonator having a second resonant frequency different from the first resonant frequency
Data Source
AI summary
A filter system includes a first resonator having a first resonant frequency, and a second resonator having a second resonant frequency different from the first resonant frequency, and electrically connected to the first resonator. A first response characteristic of the first resonator and a second response characteristic of the second resonator with respect to a frequency include a first section in which a first phase of the first resonator is equal to a second phase of the second resonator, and a second section in which the first phase is different from the second phase by 180 degrees. A first electrode of the first resonator is reversely connected to a second electrode of the second resonator.