Multisurface Grounded Filter Structure Against Moisture Gaps
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Solution Overview
Problem
Existing filters face reliability issues due to moisture or water intrusion through gaps at the interface between the laminated body and connection portions, leading to deterioration.
Innovation Solution
The filter design incorporates terminal electrodes disposed on multiple surfaces with circular-shaped connection conductors, dispersing stress and minimizing gaps, and includes multiple paths for ground connections to enhance reliability and reduce moisture intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat plate-shaped connection portion is used to connect the ground conductor to the terminal, then the electrical connection is simple, but gaps form at the interface between the laminated body and connection portion allowing foreign matters to intrude
Solution Approach 1:
The connection portion is designed with a circular cross-section instead of a flat plate shape. This circular configuration allows the connection portion to elastically deform and conform to the interface between the laminated body and the terminal, eliminating gaps and preventing foreign matter intrusion while maintaining electrical connectivity.
Solution Approach 2:
The connection portion's physical parameters are optimized by giving it a circular cross-section with specific dimensional relationships (where the diameter is larger than the thickness of the laminated body). This parameter change enables the connection portion to provide both mechanical support and sealing function simultaneously.
2Device complexity
If the terminal electrode is disposed only on the mounting surface, then the structure is simple, but stress concentrates on the connection conductors causing gap formation
Solution Approach 1:
The terminal electrode is segmented and disposed on multiple surfaces (mounting surface, side surfaces, and main surface) of the laminated body rather than being concentrated on a single surface. This segmentation distributes the mechanical stress across multiple connection points, preventing gap formation at any single interface.
Solution Approach 2:
The terminal electrode configuration transitions from a two-dimensional arrangement (only on mounting surface) to a three-dimensional arrangement extending across multiple surfaces. This dimensional expansion distributes stress more effectively throughout the structure.
Data Source
AI summary
A filter includes a first ground conductor disposed at a position closer to a main surface in an element body, a second ground conductor disposed at a position closer to a main surface in the element body, and an inductor conductor and a capacitor conductor disposed in the element body. A third terminal electrode includes a first portion disposed on the main surface, a second portion disposed on the main surface, and a third portion disposed on a side surface and connecting the first portion and the second portion. The first ground conductor and the first portion of the third terminal electrode are electrically connected by connection conductors. The second ground conductor and the second portion of the third terminal electrode are electrically connected by connection conductors.