Multilayer Coil End-Portion Layout for Lower Stray Capacitance
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Solution Overview
Problem
Existing multilayer coil components face issues with increased direct current resistance and reduced self-resonant frequency due to overlapping end portions of coil conductors, leading to proximity effects and stray capacitance, which hinder compactness and desired characteristics.
Innovation Solution
A multilayer coil component design where the end portions of coil conductors are arranged such that some overlap partially while others do not, reducing current path differences and minimizing proximity effects and stray capacitance, allowing for a compact configuration with desired characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the plurality of end portions are arranged close to each other to reduce the current path difference, then the direct current resistance is reduced, but the proximity effect and stray capacitance increase causing deterioration of characteristics
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement of end portions to a three-dimensional stacked arrangement. Multiple end portions are positioned at different heights (stacked in the first direction) while maintaining close horizontal spacing. This dimensional change allows the end portions to be electrically connected with short current paths while physically separating them to reduce proximity effects and stray capacitance between adjacent end portions.
Solution Approach 2:
The patent employs a nested arrangement where end portions are stacked vertically one above another, similar to nested dolls. Each end portion is positioned within the projection area of the element body, with subsequent end portions stacked in the first direction (vertical stacking). This nesting approach minimizes the horizontal footprint while maintaining electrical connectivity, thereby reducing current path differences without increasing proximity effects between laterally adjacent end portions.
2Object-affected harmful factors
If the distance between the end portions is increased to suppress the proximity effect, then the harmful effects are reduced, but the current path difference increases causing increased direct current resistance
Solution Approach 1:
Instead of increasing horizontal distance between end portions, the patent utilizes the vertical dimension by stacking end portions in the first direction. This allows maintaining small horizontal spacing (suppressing proximity effects) while keeping current paths short through vertical stacking. The current flows vertically through stacked end portions rather than horizontally across large distances.
Solution Approach 2:
The patent applies different spatial arrangements to different end portions based on their positions. End portions are selectively stacked in the first direction at specific locations, creating local variations in the arrangement. This localized stacking optimizes the balance between current path length and proximity effect suppression for each group of end portions.
3Reliability
If the plurality of end portions are completely separated to eliminate stray capacitance, then the self-resonant frequency is improved, but the device complexity and difficulty of achieving compact configuration increase
Solution Approach 1:
The patent resolves the complexity issue by utilizing the vertical dimension for separation. End portions are separated in the vertical direction (stacked in the first direction) rather than requiring complex horizontal routing. This simple vertical stacking approach achieves both compactness and reduced stray capacitance without complicating the overall device structure.
Data Source
AI summary
In a multilayer coil component, a coil is disposed in an element body. The coil includes a plurality of coil conductors. The plurality of coil conductors include first, second, and third end portions. The first, second, and third end portions are exposed from the element body on a first surface and connected to a first external electrode. The first, second, and third end portions are arranged in order in a first direction when viewed from a second direction along the first surface and orthogonal to the first direction. The first end portion and the third end portion overlap each other when viewed from the first direction at least in part. Each of the first end portion and the third end portion has a region not overlapping the second end portion when viewed from the first direction.