Multilayer Capacitor Electrode Geometry for Thin Low-ESR MLCCs
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining electrical characteristics and manufacturing efficiency while being miniaturized, particularly in securing sufficient electrical performance and moisture resistance with reduced thickness.
Innovation Solution
The design includes a multilayer capacitor with specific internal and external electrode structures, featuring inclined and connection portions that optimize current paths, reduce equivalent series resistance (ESR) and equivalent series inductance (ESL), and enhance manufacturing efficiency, with a focus on a four-terminal structure and specific geometric configurations to improve contact areas and alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the multilayer ceramic capacitor is made thinner to reduce size, then the thickness is reduced, but the electrical characteristics and moisture resistance deteriorate
Solution Approach 1:
The lead-out portion of the internal electrode is divided into multiple segments: an inclined portion with a specific angle (45-60 degrees) and a connection portion. This segmentation allows each part to fulfill specific functions - the inclined portion optimizes current flow and reduces ESR, while the connection portion ensures reliable connection to external electrodes, thereby maintaining electrical characteristics even in thin capacitors
Solution Approach 2:
The lead-out portion is designed with asymmetric geometry where the inclined portion has a specific angle range (45-60 degrees) relative to the main portion, rather than a symmetric straight extension. This asymmetric design optimizes the current path and electrical field distribution, improving electrical characteristics while maintaining reduced thickness
2Length of moving object
If the dielectric layer and internal electrodes are made thinner to reduce capacitor size, then the thickness is reduced, but the manufacturing efficiency and electrical performance deteriorate
Solution Approach 1:
The internal electrode is designed with different local geometries: the main portion has a standard configuration while the lead-out portion features an inclined section with specific angle (45-60 degrees) and a connection portion. This local quality variation optimizes both manufacturing alignment (easier positioning at corners) and electrical performance without requiring overall thickening of the capacitor
Data Source
AI summary
A multilayer capacitor includes a body including a dielectric layer and first and second internal electrodes, first external electrodes respectively be connected to the first internal electrode and second external electrodes respectively connected to the second internal electrode. The first internal electrode includes a first main portion and a first lead-out portion. The first lead-out portion includes a first inclined portion and a first connection portion. The first inclined portion is connected to the first main portion and has a side surface, at least a portion of which is inclined with respect to a side surface of the first main portion connected thereto. The first connection portion is connected to the first inclined portion and the first external electrode, and has a side surface, at least a portion of which is inclined with respect to the side surface of the first inclined portion connected thereto.