Dielectric Resonator Filter Layout for Stable Attenuation
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Solution Overview
Problem
Existing filters face challenges in maintaining consistent attenuation characteristics due to manufacturing variations and variations in coupling degrees between resonators, leading to suboptimal performance.
Innovation Solution
A filter design featuring a dielectric substrate with resonators arranged in point symmetry and via electrode portions formed by multiple small-diameter via electrodes, which reduce manufacturing complexity and material usage, while ensuring consistent coupling and improved attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resonators are arranged with point symmetry to reduce manufacturing variation, then attenuation characteristics are improved, but device complexity increases due to precise positioning requirements
Solution Approach 1:
The patent applies asymmetry principle by intentionally introducing asymmetric via electrode portions (different numbers of via electrodes on different sides) to compensate for manufacturing variations. This asymmetric design balances the coupling characteristics and improves attenuation without requiring perfect symmetric positioning of all components.
Solution Approach 2:
The patent changes the parameter of via electrode configuration by using different numbers of via electrodes on different sides (e.g., 2 on one side, 1 on the other) to adjust and balance coupling characteristics. This parameter variation compensates for manufacturing tolerances and maintains consistent attenuation performance.
2Manufacturing precision
If via electrode portions use multiple small-diameter via electrodes, then manufacturing precision is improved, but device complexity increases due to multiple components
Solution Approach 1:
The patent segments the via electrode structure into multiple small-diameter via electrodes arranged in arrays on different sides. This segmentation allows precise control of coupling characteristics while maintaining manufacturability through standardized via hole formation processes.
Solution Approach 2:
The patent transitions from a single via electrode approach to multiple via electrodes arranged in two-dimensional arrays. This dimensional change enables fine-tuning of coupling characteristics through spatial distribution while using standard manufacturing techniques.
3Loss of energy
If resonator spacing is increased to improve Q value, then insertion loss is reduced, but filter size increases
Solution Approach 1:
The patent changes the coupling parameter by using asymmetric via electrode configurations to achieve the desired coupling strength at smaller resonator spacings. This allows maintaining high Q values and low insertion loss without increasing filter size, as the via electrode design compensates for reduced spacing.
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 design achieves a small-scale filter with excellent characteristics by minimizing variations in coupling and attenuation, resulting in stable and efficient frequency performance.
Implementation Method 1
a plurality of resonators that are formed within the dielectric substrate and surrounded by shield conductors
Implementation Method 2
the inductive coupling (degree of coupling) between the two resonators can be adjusted by the via holes for coupling adjustment
Data Source
AI summary
This filter comprises: a dielectric substrate; a plurality of resonators that are formed inside the dielectric substrate, and for which the periphery is surrounded by a shielding conductor; and input/output terminals that are formed at a portion at which the shielding conductor is not formed. The resonator closest to the input/output terminal of the plurality of resonators and the resonator that is closest to the input/output terminal of the plurality of resonators are in a point-symmetrical positional relationship.