Laminated Coil Component Stray Capacitance Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional laminated coil components face challenges in reducing stray capacitance, which leads to a decrease in self-resonant frequency and compromised Q characteristics in high frequency ranges.
Innovation Solution
The laminated coil component design features a coil with first and second wiring portions of different widths and thicknesses, along with strategically positioned connection portions, to minimize stray capacitance by adjusting the distances and cross-sectional areas, thereby improving frequency stability and Q characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width of the second wiring portion is increased to match the first wiring portion, then the manufacturing precision is improved, but the stray capacitance increases causing self-resonant frequency to decrease
Solution Approach 1:
The patent applies local quality by making the second wiring portion narrower than the first wiring portion. This localized dimensional variation reduces the overlapping area between adjacent second wiring portions, thereby reducing stray capacitance and preventing self-resonant frequency decrease, while maintaining manufacturing feasibility through controlled width differences.
Solution Approach 2:
The patent employs asymmetry by intentionally creating different widths between the first wiring portion and the second wiring portion. This asymmetric design breaks the symmetry that would otherwise exist in a uniform coil structure, specifically reducing the width of the second wiring portion to minimize parasitic capacitance effects and improve high-frequency performance.
2Reliability
If the distance between adjacent second wiring portions is increased to reduce stray capacitance, then the self-resonant frequency is maintained, but the coil area increases
Solution Approach 1:
The patent applies local quality by selectively reducing the width of the second wiring portion only in regions where it overlaps with adjacent wiring portions. This localized dimensionality control reduces stray capacitance without requiring increased spacing between all wiring portions, thereby maintaining compact coil area while preserving self-resonant frequency characteristics.
3Reliability
If the width of the second wiring portion is reduced to reduce stray capacitance, then the Q characteristic in high frequency range is improved, but the electrical resistance of the second wiring portion increases
Solution Approach 1:
The patent applies local quality by reducing the width of the second wiring portion only in the regions where it overlaps with adjacent second wiring portions, while maintaining adequate width in other regions. This selective width control reduces stray capacitance and improves Q characteristic in the high frequency range, while minimizing the increase in electrical resistance by avoiding uniform width reduction throughout the entire second wiring portion.
Data Source
AI summary
A laminated coil component includes an element body, a first terminal electrode and a second terminal electrode, and a coil, the coil includes a plurality of first wiring portions disposed on a main surface side and disposed side by side in a third direction, a plurality of second wiring portions disposed on a mounting surface side and disposed side by side in the third direction, and a plurality of first pillar portions and second pillar portions that extend in a second direction and connect the first wiring portion with the second wiring portion which correspond to each other, and a width of the second wiring portion in the third direction is smaller than a width of the first wiring portion in the third direction.