Capacitive Coupling Filter Layout for Stable Resonator Performance
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Solution Overview
Problem
There is a need for a technology that can realize more satisfactory filter characteristics, as existing filters do not effectively address this requirement.
Innovation Solution
A filter is designed with a plurality of resonators formed inside a dielectric substrate, each equipped with a via electrode portion, and a first capacitive coupling structure. This structure includes electrode patterns connected to the via electrode portions and a coupling capacitance electrode with a specific dimensional difference relative to the electrode patterns, ensuring effective overlap and non-overlap regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the coupling capacitance electrode is made smaller to reduce device complexity, then manufacturing precision becomes more difficult to maintain due to positional shifting
Solution Approach 1:
The patent changes the dimensional parameters by creating a specific size difference between the coupling capacitance electrode and the electrode pattern, and by establishing a specific ratio relationship between the dimensional difference and inter-electrode distance. This parameter optimization allows the coupling capacitance to remain stable even when positional shifting occurs during manufacturing, thereby resolving the contradiction between reducing device complexity and maintaining manufacturing precision.
2Ease of manufacture
If the filter design is simplified to improve ease of manufacture, then filter characteristics become less satisfactory
Solution Approach 1:
The patent optimizes specific parameters including the dimensional difference between electrodes and the ratio of this difference to the inter-electrode distance. These parameter changes enable the filter to maintain satisfactory characteristics while using a relatively simple capacitive coupling structure, thus resolving the contradiction between ease of manufacture and filter performance.
3Reliability
If the electrode dimensions are increased to improve coupling capacitance stability, then device area increases
Solution Approach 1:
Instead of simply increasing electrode dimensions, the patent changes the parameter relationship by creating an optimal dimensional difference and establishing a specific ratio with the inter-electrode distance. This approach maintains coupling capacitance stability while avoiding unnecessary increases in device area, as the stability is achieved through the proportional relationship rather than absolute size.
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 filter achieves satisfactory characteristics by effectively managing the coupling capacitance, which is maintained even with positional shifting during manufacturing, ensuring consistent filter performance.
Implementation Method 1
a first capacitive coupling structure including a first electrode pattern connected to any one from among the plurality of via electrode portions, a second electrode pattern connected to any one from among the plurality of via electrode portions, and a first coupling capacitance electrode
Data Source
AI summary
A filter is provided with a plurality of resonators and a first capacitance coupling structure including a first electrode pattern, a second electrode pattern, and a first coupling capacitance electrode. A first dimensional difference, which is a value obtained by subtracting a dimension of the first coupling capacitance electrode in a width direction of the first coupling capacitance electrode from a dimension of the first electrode pattern in the width direction of the first coupling capacitance electrode, is 1.4 times or more of a first inter-electrode distance, which is a distance between the first coupling capacitance electrode and the first electrode pattern in a thickness direction of the first coupling capacitance electrode.