Multilayer Coil Layout for Low Resistance and Low Stray Capacitance
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Solution Overview
Problem
Multilayer coil components have high direct current resistance, which hinders the increase of rated current and degrades high frequency characteristics, despite existing designs optimizing for high frequency performance in the GHz band.
Innovation Solution
A multilayer coil component design with a coil length between 85% and 94% of the multilayer body length, featuring specific coil conductor dimensions and spacing, and outer electrodes strategically positioned to reduce stray capacitance and direct current resistance while maintaining high frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the coil length is increased to decrease direct current resistance, then the direct current resistance decreases, but the high frequency characteristics deteriorate due to increased stray capacitance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the coil length to be 85-94% of the multilayer body length, and by optimizing the ratio a/(a+b) where a is the coil conductor length and b is the spacing between adjacent coil conductors. This specific parameter range optimizes the balance between direct current resistance and stray capacitance, achieving both low resistance and good high frequency characteristics simultaneously.
2Loss of energy
If the coil conductor spacing is decreased to reduce direct current resistance, then the direct current resistance decreases, but the stray capacitance increases degrading high frequency performance
Solution Approach 1:
The patent optimizes the spacing parameter b relative to the coil conductor length a by controlling the ratio a/(a+b) within the specified range. This parameter optimization allows the coil conductors to be sufficiently close to minimize direct current resistance while maintaining adequate spacing to control stray capacitance, resolving the contradiction between these two opposing requirements.
Data Source
AI summary
A multilayer coil component includes a multilayer body including insulating layers and having a first end face and a second end face, a first main surface and a second main surface, and a first side surface and a second side surface; a coil provided inside the multilayer body; a first outer electrode spreading from part of the first end face over part of the first main surface; and a second outer electrode spreading from part of the second end face over part of the first main surface. The laminating direction of the insulating layers and a direction of a coil axis of the coil are parallel to the first main surface as a mount surface. The coil has a length in a length direction from 85% to 94% of the length of the multilayer body in the length direction.