Dielectric Filter Resonator Cutouts to Prevent Manufacturing Cracks
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Solution Overview
Problem
The manufacturing of dielectric filters is prone to structural defects due to differences in thermal expansion coefficients between areas of high and low conductor density, leading to cracks and performance degradation.
Innovation Solution
A dielectric filter design with cutouts at the connection points between resonators and shield conductors reduces conductor density, preventing structural defects and maintaining performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductor density in the stacking direction is increased in certain portions, then the electrical performance of the dielectric filter is improved, but structural defects such as cracks occur during manufacturing due to thermal expansion differences
Solution Approach 1:
The patent applies local quality by creating a non-uniform conductor density distribution within the dielectric layers. Specifically, the conductor density is increased in specific regions (such as near resonators or in ground layers) to improve electrical performance locally, while maintaining lower density in other areas to prevent thermal expansion issues. This spatial variation in conductor density allows simultaneous optimization of electrical performance and manufacturing reliability.
Solution Approach 2:
The patent changes the physical parameters of the conductor-dielectric composite structure by controlling the conductor density as a variable parameter. By adjusting the conductor density in different portions of the dielectric layers, the patent optimizes the balance between electrical performance (which benefits from higher density) and manufacturing integrity (which suffers from excessive density variations). This parameter control is achieved through selective placement and density adjustment of conductors during the manufacturing process.
2Manufacturing precision
If the conductor density is reduced at connection portions, then structural defects are prevented during manufacturing, but the current carrying capacity may be affected
Solution Approach 1:
The patent applies local quality by creating distinct conductor density zones: lower density at connection portions to prevent manufacturing defects, and higher density in active regions to ensure adequate current carrying capacity. The connection portions (where conductors join dielectric layers or connect to resonators) have reduced conductor density to minimize thermal expansion differences, while the resonator regions and signal paths maintain higher conductor density for optimal electrical performance.
Solution Approach 2:
The patent segments the conductor density distribution into different functional zones within the dielectric structure. Connection portions are segmented with lower conductor density to prevent cracks during manufacturing, while active portions (resonators, signal paths) are segmented with higher conductor density for electrical performance. This segmentation allows each zone to be optimized independently for its specific function.
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 cutout design prevents structural defects during manufacturing, ensuring consistent performance and reducing conduction loss in dielectric filters.
Implementation Method 1
a difference in thermal expansion coefficient between a portion where the conductor density is large and a portion where the conductor density is small may cause a structural defect such as a crack to occur
Data Source
AI summary
A filter device includes a stack body, plate electrodes, resonators, and shield conductors. The plate electrodes are disposed inside the stack body apart from each other in the stacking direction. The resonators are disposed between the plate electrodes and extend in the Y-axis direction. The shield conductors are disposed on the side surfaces of the stack body, respectively. The shield conductors are connected to the plate electrodes. The resonators are disposed inside the stack body side by side in the X-axis direction. A first end of each of the resonators is connected to the shield conductor, and a second end thereof is separated from the shield conductor. The first end of each of the resonators is formed with a cutout.