Coil Component Non-Uniform Line Width Stray Capacitance
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Solution Overview
Problem
Existing coil components face challenges in achieving high inductance and Q values due to variations in stray capacitance caused by misalignment and pattern variations in conductive layers, leading to decreased performance at high frequencies and increased resistance.
Innovation Solution
A coil component design with circulating conductive layers having wider short side portions and narrower long side portions, along with strategically positioned via pads, to minimize stray capacitance and maintain high Q values while preventing resistance increases, allowing for a more efficient cross-sectional area shape and stable performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the line width of the circulating conductive layers is uniformly increased, then the stray capacitance variations are reduced, but the cross-sectional area of the inside of the coil decreases, causing significant decrease in L value and Q value
Solution Approach 1:
The patent applies local quality by making the line width of the circulating conductive layers non-uniform: wider in regions where via holes are formed and narrower in other regions. This localized variation in line width allows via pads to be properly formed (maintaining stable stray capacitance) while preserving sufficient cross-sectional area in the coil interior (maintaining high L and Q values).
Solution Approach 2:
The patent introduces asymmetry in the line width design of the circulating conductive layers. Instead of uniform width, the line width varies asymmetrically - wider at via hole locations and narrower elsewhere - creating an optimized configuration that simultaneously addresses stray capacitance stability and energy loss reduction.
2Loss of energy
If the line width of the circulating conductive layers is uniformly decreased, then the cross-sectional area of the inside of the coil increases, but the resistance value increases, causing decrease in Q value
Solution Approach 1:
The patent applies local quality by maintaining narrower line widths in most regions (increasing cross-sectional area efficiency) while providing wider line widths specifically at via hole locations (maintaining low resistance and high Q value). This localized differentiation resolves the contradiction between area efficiency and reliability.
3Loss of energy
If the line width of the circulating conductive layers is decreased, then the cross-sectional area of the inside of the coil increases, but the via pad areas become dominant in the cross-sectional area, making it difficult to reduce stray capacitance variations
Solution Approach 1:
The patent applies local quality by creating wider line width regions specifically at via hole locations to form adequate via pads (reducing stray capacitance variations) while maintaining narrower line widths in other regions (preserving cross-sectional area efficiency). This localized differentiation allows both requirements to be satisfied simultaneously.
Data Source
AI summary
A coil conductor has a central axis extending in parallel with a mounting surface. The coil conductor disposed inside a component body extends substantially helically by alternately connecting a plurality of circulating conductive layers and a plurality of via hole conductors. The circulating conductive layers each extend so as to form a part of a substantially quadrangular track having a relatively short side and a relatively long side along an interface between the insulating layers. The via hole conductors each penetrate the insulating layer in a thickness direction. The line width of a short side portion of the circulating conductive layer is wider than that of a long side portion of the circulating conductive layer.