Coil Component Shielding Layer for EMI Reduction
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Solution Overview
Problem
Inductors in electronic devices face challenges in miniaturization and multifunctionality, particularly in high-frequency applications, where they struggle to effectively manage electromagnetic interference (EMI) and leakage magnetic flux, impacting the performance and noise shielding of portable devices.
Innovation Solution
A coil component design incorporating a shielding layer with a ceramic insulating layer, which includes a metal ingredient and is anodized, is integrated with a body containing magnetic materials and a coil pattern, providing efficient electromagnetic wave shielding and reducing leakage magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield can is used to enclose the electronic component and board for EMI shielding, then electromagnetic interference shielding is improved, but device size increases and miniaturization is hindered
Solution Approach 1:
The shielding layer is integrated within the multilayer ceramic capacitor structure itself, nested between internal electrodes and external terminals, eliminating the need for external shield cans while maintaining EMI shielding functionality. The capacitor body becomes the container for the shielding function.
Solution Approach 2:
The multilayer ceramic capacitor is designed to perform multiple functions simultaneously: energy storage, EMI shielding, and noise filtering. The shielding layer is incorporated as part of the capacitor structure, allowing a single component to replace what would traditionally require multiple separate components (capacitor plus shield can).
2Volume of moving object
If the inductor size is reduced for miniaturization, then device compactness is improved, but leakage magnetic flux increases
Solution Approach 1:
A magnetic shielding layer containing ferromagnetic powder is introduced as an intermediary material within the capacitor body. This layer acts as a mediator that guides and contains magnetic flux lines, preventing leakage while allowing the inductor to maintain a compact size. The ferromagnetic material provides a low-reluctance path for magnetic flux.
3Productivity
If high-frequency operation is implemented for improved performance, then device functionality is enhanced, but electromagnetic noise and interference increase
Solution Approach 1:
The capacitor structure incorporates specific parameter changes including dielectric constant optimization, loss tangent reduction, and shielding layer configuration that are tailored for high-frequency operation. These parameter adjustments enable the capacitor to effectively filter high-frequency noise while maintaining stable electrical characteristics at elevated frequencies.
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
The design significantly decreases leakage magnetic flux, enhances EMI shielding, and supports miniaturization, ensuring stable operation and improved performance in high-frequency applications.
Implementation Method 1
The ceramic insulating layer may be an anodized layer of the metal ingredient of the shielding layer
Data Source
AI summary
A coil component includes a body, a coil part including a coil pattern and embedded in the body, an external electrode disposed on an external surface of the body and electrically connected to the coil part, a shielding layer disposed on the external surface of the body, and a ceramic insulating layer disposed on a surface of the shielding layer.