Ceramic Capacitor with Integrated EMI Shielding Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ceramic capacitors in electronic devices generate significant electromagnetic interference (EMI) noise due to exposed pads and pins, which can contribute to substantial EMI noise within the device, especially when numerous capacitors are present.
Innovation Solution
A multi-layered ceramic capacitor (MLCC) with a built-in EMI shield is designed, featuring conductive coatings on its outer peripheral regions to act as a Faraday cage, providing electrical grounding and reducing EMI noise. This design eliminates the need for external EMI shields and enhances volumetric efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ceramic capacitors are used in high speed interfaces, then functional performance is improved, but electromagnetic interference noise increases
Solution Approach 1:
The patent merges the EMI shielding function with the capacitor structure by integrating a conductive coating on the outer peripheral region of the capacitor body. This combines two previously separate components (capacitor and EMI shield) into a single integrated unit, eliminating the need for external shields while maintaining both capacitive function and EMI protection
Solution Approach 2:
The conductive coating acts as an intermediary element between the capacitor's internal electrodes and the external environment. This coating layer provides a controlled interface that manages electromagnetic field interaction, containing internal EMI noise while allowing the capacitor to maintain its electrical function
2Object-affected harmful factors
If external EMI shields are added to reduce noise, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The EMI shielding function is merged directly into the capacitor body through a conductive coating applied to the outer peripheral region. This integration eliminates separate EMI shield components and their associated mounting requirements, reducing overall device complexity while maintaining EMI protection
Solution Approach 2:
The capacitor structure is designed to perform multiple functions simultaneously: the conductive coating provides both electrical connection functionality and EMI shielding. This multi-functionality reduces the need for additional dedicated EMI shield components, simplifying the overall device architecture
3Object-affected harmful factors
If conductive coating is applied to outer peripheral region, then EMI shielding is provided, but manufacturing complexity increases
Solution Approach 1:
The conductive coating is applied during the capacitor manufacturing process itself, before the capacitor is assembled into the final device. This preliminary application of the EMI shielding layer during initial fabrication avoids the need for separate post-assembly shielding operations, simplifying the overall manufacturing workflow
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 built-in EMI shield effectively contains EMI noise emanating from the capacitor, reducing electromagnetic interference and improving the overall efficiency of electronic devices by integrating the shielding directly into the capacitor structure.
Implementation Method 1
conductive coatings on its outer peripheral regions to act as a Faraday cage, providing electrical grounding and reducing EMI noise
Data Source
AI summary
This disclosure describes methods and systems for minimizing electromagnetic interference (EMI) noise emanating from a ceramic capacitor. The ceramic capacitor may include several terminations are on a bottom portion of the capacitor. The capacitor may be designed to include several capacitors formed from electrode layers. The capacitor may include a conductive coating on an outer peripheral portion. The coating may include conductive materials such as Cu, Ni, Ag, and/or graphite. Alternatively, some regions of the capacitor may include electrode layers built into the capacitor that are not associated with capacitors. In this manner, the ceramic capacitor may be free of the conductive coating to locations proximate to the described electrode layers not associated with capacitors. The conductive coating can act as an electromagnetic shielding to prevent the EMI noise from emanating outside the electromagnetic shielding. Also, the conductive coating can be electrically grounded (e.g., to printed circuit board) via terminals.