Capacitor Side Margin Electrodes for ESL Reduction
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in miniaturization and high-capacity demands due to high equivalent series inductance (ESL), which affects their ability to effectively remove high-frequency noise signals beyond the self-resonant frequency.
Innovation Solution
The capacitor component design includes a body with internal and external electrodes, and side margin portions with dielectric layers and margin electrodes, which disperse current to reduce ESL by minimizing the step difference between internal electrodes and dielectric layers, thereby improving current distribution and reducing capacitance loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the capacitor component uses traditional internal electrode structure without side margin portions, then the manufacturing process is simpler, but the equivalent series inductance (ESL) is high which limits high-frequency noise removal capability
Solution Approach 1:
The capacitor component is segmented into multiple functional regions: central electrode area and side margin portions. The side margin portions are further divided into first and second margin portions with different electrode configurations. This segmentation allows current to flow through multiple parallel paths, reducing ESL while maintaining manufacturability through modular design.
Solution Approach 2:
The patent extends the electrode structure from a single-plane configuration to a three-dimensional multi-layer structure with electrodes arranged in the first, second, and third directions. Margin electrodes are positioned on side surfaces and connected to external electrodes through conductive paths, creating additional current flow dimensions that reduce inductance without significantly increasing manufacturing complexity.
2Quantity of substance
If the capacitor component increases capacity through more internal electrodes, then the capacitance increases, but the equivalent series inductance also increases reducing high-frequency performance
Solution Approach 1:
The electrode system is divided into multiple independent electrode pairs arranged in different directions (first, second, and third directions). Each electrode pair functions as an independent capacitance element while also serving as a current path. The side margin portions with margin electrodes create additional parallel current paths that reduce overall ESL while the cumulative capacitance of multiple electrode pairs increases total capacity.
Solution Approach 2:
The internal electrodes serve dual functions: they create capacitance through dielectric layers and simultaneously act as current conduction paths. The margin electrodes on side surfaces also serve dual purposes by providing additional current paths for ESL reduction and by extending the effective electrode area for increased capacitance. This multi-functionality allows simultaneous optimization of both capacity and high-frequency performance.
Data Source
AI summary
A capacitor component includes a body including a first surface and a second surface opposing each other in a first direction, a third surface and a fourth surface connected to the first and second surfaces and opposing each other in a second direction, a fifth surface and a sixth surface connected to the first to fourth surfaces and opposing each other in a third direction, and including a first dielectric layer, and a first internal electrode and a second internal electrode disposed to oppose each other in the first direction with the first dielectric layer interposed therebetween, and a first side margin portion and a second side margin portion, respectively including a second dielectric layer, a first margin electrode, and a second margin electrode, disposed in parallel with the fifth and sixth surfaces of the body, and respectively disposed on the fifth and sixth surfaces of the body.