Coil Component Shielding Via for EMI Leakage
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Solution Overview
Problem
In electronic devices, coil components face challenges in minimizing leakage magnetic flux while maintaining high inductance and quality factor, which is crucial for effective EMI shielding and performance in miniaturized systems.
Innovation Solution
A coil component design incorporating a shielding via with higher permeability than the body material, embedded in the same direction as the coil turns, to reduce leakage magnetic flux and enhance inductance and quality factor without external shielding cans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield can is used to enclose the electronic component and board, then EMI shielding is improved, but device complexity and size increase
Solution Approach 1:
The patent merges the shielding function with the coil component itself by integrating a shielding layer directly into the coil structure. This eliminates the need for separate shield cans while maintaining EMI shielding effectiveness, thereby reducing device complexity and size.
Solution Approach 2:
The coil component is designed to perform multiple functions simultaneously: it provides inductance through its coil structure while also providing EMI shielding through the integrated shielding layer. This multi-functionality eliminates the need for separate shielding components.
2Object-affected harmful factors
If a shield can is used to enclose the electronic component and board, then EMI shielding is improved, but the component size increases
Solution Approach 1:
The shielding function is merged into the coil component structure itself, eliminating the need for additional external shield cans. This integration maintains EMI shielding effectiveness while significantly reducing the overall component size and volume.
Solution Approach 2:
The shielding layer is nested within the coil component structure, with the shielding layer positioned inside or integrated with the coil windings. This nested arrangement provides shielding functionality without increasing the external dimensions of the component.
3Reliability
If leakage magnetic flux is not controlled, then device simplicity is maintained, but inductance and quality factor deteriorate
Solution Approach 1:
The shielding layer is strategically positioned in specific locations within the coil structure where magnetic flux leakage occurs most significantly. This localized approach controls magnetic flux effectively while minimizing the overall structural complexity of the coil component.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively decreases leakage magnetic flux, improves inductance and quality factor, and supports the miniaturization and high-performance requirements of electronic devices by integrating the shielding within the coil component itself.
Implementation Method 1
a shielding via having a permeability higher than that of a body and extending in the body in the same direction as a turn direction of a coil part
Data Source
AI summary
A coil component includes: a body; a coil part including a coil pattern embedded in the body and having at least one turn winding around on one direction; first and second external electrodes disposed on a surface of the body and connected to the coil part; and a shielding via having a permeability higher than that of the body and extending along the one direction in the body.