Multilayer Inductor Layout for Lower Stray Capacitance
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Solution Overview
Problem
Multilayer inductor components experience stray capacitance issues between the inductor wire and electrodes, leading to a decreased Q value due to excessive capacitance.
Innovation Solution
The configuration of the multilayer inductor component is optimized by ensuring the top surface-side conductor area is 1.1 times or more of the bottom surface-side conductor area, reducing stray capacitance by minimizing conductor area opposition to electrodes and maintaining a uniform wire width for inductor conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the inductor wire is positioned closer to the bottom surface electrode, then the magnetic flux is enhanced, but the stray capacitance increases and Q value decreases
Solution Approach 1:
The patent applies asymmetry by making the top surface-side conductor area 1.1 times or more of the bottom surface-side conductor area. This asymmetric distribution shifts the inductor wire position relative to the electrode opposition, reducing stray capacitance between the inductor wire and bottom surface electrode while maintaining magnetic flux generation efficiency.
Solution Approach 2:
The patent changes the geometric parameter of conductor area distribution by specifying that the top surface-side conductor area must be 1.1 times or more of the bottom surface-side conductor area. This parameter change optimizes the balance between magnetic flux generation and stray capacitance reduction, thereby improving Q value.
2Quantity of substance
If the conductor area near the bottom surface is increased, then the current carrying capacity is improved, but the stray capacitance with the electrode increases
Solution Approach 1:
The patent applies local quality by creating different conductor area characteristics at different locations: the top surface-side conductor area is made 1.1 times or more of the bottom surface-side conductor area. This local differentiation allows sufficient current carrying capacity at the top while minimizing stray capacitance effects near the bottom surface electrode.
Solution Approach 2:
The asymmetric conductor area distribution (top surface-side area ≥ 1.1 × bottom surface-side area) creates an optimal balance between current carrying capacity and stray capacitance reduction, preventing excessive capacitance formation between the inductor wire and bottom surface electrode.
3Volume of moving object
If the inductor component is miniaturized, then the mounting density is improved, but the wire breaking risk increases due to internal stress
Solution Approach 1:
The patent changes the conductor area distribution parameter to reduce internal stress in miniaturized components. By making the top surface-side conductor area 1.1 times or more of the bottom surface-side conductor area, the stress distribution is optimized, reducing wire breaking risk while maintaining small component size for high mounting density.
Data Source
AI summary
A multilayer inductor component includes an element body and an inductor wire. The element body has a bottom surface, and a surface parallel to the bottom surface is a top surface. The inductor wire has inductor conductors extending parallel to the bottom surface and via conductors extending along an orthogonal axis orthogonal to the bottom surface. The area of each inductor conductor when viewed in the direction along the orthogonal axis is a conductor area, and the number of the inductor conductors is N. In the direction along the orthogonal axis, a top surface-side conductor area that is a sum of conductor areas of the inductor conductor closest to the top surface to the N/2th inductor conductor is 1.1 times or more of a bottom surface-side conductor area that is a sum of conductor areas of the inductor conductor closest to the bottom surface to the N/2th inductor conductor.