Dielectric Filter Electrode Layout for Dimensional Accuracy
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Solution Overview
Problem
The existing dielectric filters face issues with dimensional accuracy due to variations in electrode lamination density, leading to potential degradation in filter performance.
Innovation Solution
The dielectric filter design incorporates a cuboid laminated body with evenly spaced resonator and capacitor portions, where resonant and capacitive electrode elements are arranged to maintain consistent gaps and non-overlapping ends, reducing electrode lamination density differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the capacitor portion is formed by one electrode element while the resonator portion is formed by multiple electrode elements, then the filter structure is simplified, but the electrode lamination density becomes non-uniform causing degradation in dimensional accuracy
Solution Approach 1:
The capacitor portion is divided into multiple capacitor electrode elements (first, second, third capacitor electrode elements) corresponding to the multiple resonator portions. This segmentation allows the electrode lamination density to be uniform across all layers, resolving the dimensional accuracy issue while maintaining the simplified capacitor design concept.
Solution Approach 2:
Each capacitor electrode element is locally configured to correspond to its respective resonator portion, with specific spacing relationships (e.g., the first capacitor electrode element spaced from the first resonator portion). This local optimization ensures uniform electrode distribution throughout the laminated body while maintaining functional simplicity.
2Reliability
If electrode elements are densely laminated in the resonator region but sparsely in the capacitor region, then the resonator functionality is enhanced, but the overall dimensional accuracy of the filter degrades
Solution Approach 1:
The electrode structure is segmented into multiple pairs of resonator and capacitor electrode elements distributed across different layers. Each pair maintains consistent spacing and configuration, ensuring that electrode lamination density is uniform throughout the laminated body while preserving resonator functionality in each segment.
Solution Approach 2:
The resonator and capacitor functions are merged into integrated electrode pairs where resonator electrode elements and capacitor electrode elements are laminated together in corresponding layers. This merging ensures uniform electrode distribution and consistent dimensional characteristics across the entire filter 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
This design secures dimensional accuracy and enhances filter performance by ensuring even electrode distribution and consistent signal transmission.
Implementation Method 1
a band-pass filter (hereinafter also referred to as a 'dielectric filter') using a dielectric resonator
Implementation Method 2
forms a capacity between the capacitor portion and the resonator portion by a gap between the electrode element in the upper layer and the electrode element in the lower layer
Data Source
AI summary
A filter device includes a laminated body, a plurality of resonator portions, and a plurality of capacitor portions facing the plurality of resonator portions in a Y-axis direction, respectively. Each of the resonator portions is formed by a plurality of resonant electrode elements. Each of the capacitor portions is formed by a plurality of capacitive electrode elements. The plurality of resonant electrode elements in the resonator portion are formed such that all of facing ends with respect to the capacitive electrode elements do not overlap with each other when viewed in a planar view from a Z-axis direction. The capacitive electrode elements in the capacitor portion are formed such that a gap between the capacitive electrode element and the resonant electrode element facing each other in a Y-axis direction is substantially constant in each layer in the Z-axis direction.