Inductor EMI Shielding via Nested Electrode Structure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing inductors fail to effectively mitigate electromagnetic interference (EMI) noise, which can weaken circuit functions and cause malfunctions, especially as semiconductor chip performance improves.
Innovation Solution
An inductor design featuring a substrate with top and bottom coils, an encapsulation portion, terminal electrodes, and a shielding layer made of materials like carbon, aluminum, or iron, which covers the body to shield EMI noise, with an external insulating layer for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is added to cover the inductor body, then EMI shielding function is improved, but device complexity increases
Solution Approach 1:
The shielding layer is integrated within the encapsulation portion that already surrounds the coil assembly, creating a nested structure where the shielding function is embedded within the existing protective housing rather than adding a separate external component
Solution Approach 2:
The shielding layer is implemented as a thin film or coating applied to the inner surface of the encapsulation portion, providing effective EMI shielding without significantly increasing the overall size or complexity of the inductor structure
2Object-affected harmful factors
If multiple terminal electrodes are disposed on the bottom surface, then EMI shielding function is improved, but manufacturing precision requirements increase
Solution Approach 1:
The bottom surface of the inductor is designed to accommodate multiple terminal electrodes (first, second, and third terminal electrodes) that serve dual purposes: electrical connection and EMI shielding reference planes, eliminating the need for separate shielding structures
Solution Approach 2:
The first, second, and third terminal electrodes are configured to create equipotential reference planes on the bottom surface, which effectively suppress EMI by providing stable reference potentials without requiring extremely tight positioning tolerances
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 inductor effectively shields EMI noise, preventing signal interference and ensuring stable circuit performance, while maintaining a compact and ultra-slim profile suitable for various electronic applications.
Implementation Method 1
a shielding layer disposed to cover the body. The shielding layer is connected to the third terminal electrode
Implementation Method 2
a coil portion, including a top coil and a bottom coil disposed on one surface and the other surface of the substrate, respectively
Data Source
AI summary
An inductor includes a body including a substrate, a coil portion, including a top coil and a bottom coil disposed on one surface and the other surface of the substrate, respectively, and an encapsulation portion encapsulating the substrate and the coil portion, a first terminal electrode, disposed on a bottom surface of the body and connected to the top coil, and a second terminal electrode disposed on the bottom surface of the body and connected to the bottom coil, a third terminal electrode disposed between the first and second terminal electrodes and disposed on the bottom surface of the body, and a shielding layer disposed to cover the body. The shielding layer is connected to the third terminal electrode.