Dual-Resonator Filter Layout for Sharper Pass-Stop 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 filtering, resulting in suboptimal performance due to broad transition regions and inadequate signal differentiation.
Innovation Solution
A filter system comprising at least two resonators with distinct resonant frequencies and reversely connected electrodes, where the first resonator's phase matches the second resonator's phase in one frequency section and differs by 180 degrees in another, enhancing signal reduction and maintaining constant response characteristics across specific frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single resonator or simple filter structure is used, then the device complexity is low, but the transition region between pass-band and stop-band becomes broad and signal differentiation is poor
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 parallel between the input and output nodes, creating a composite filtering structure that achieves sharp transition regions and clear signal differentiation while maintaining relatively simple overall architecture.
Solution Approach 2:
The filter system is segmented into multiple independent resonator units, each with distinct resonant frequencies. This segmentation allows each resonator to handle specific frequency components, enabling clear distinction between pass-band and stop-band signals while maintaining manageable device complexity through modular design.
2Reliability
If multiple resonators with different resonant frequencies are used, then the transition region becomes narrow and pass-band/stop-band distinction is clear, but the device complexity increases
Solution Approach 1:
Multiple resonators are merged into a parallel configuration sharing common input and output nodes. This merging approach achieves reliable filtering performance with clear pass-band/stop-band distinction while avoiding the complexity of cascaded or series configurations, as all resonators work simultaneously rather than sequentially.
Solution Approach 2:
Each resonator is designed with specific local characteristics (different resonant frequencies) tailored to handle particular frequency ranges. This local quality differentiation within the unified parallel structure enables high reliability filtering performance while keeping the overall device configuration simple and manageable.
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 narrow transition region with a sharp skirt characteristic, significantly improving signal differentiation and filter performance by reducing signal values outside resonant frequencies and maintaining high signal values between them.
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.