Asymmetric Multilayer Ceramic Capacitor Electrode Design
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in minimizing capacitance variations as frequency bands increase, particularly due to variations in the effective area of internal electrodes during stacking, which affects capacitance value and connectivity.
Innovation Solution
The design includes internal electrodes with different main portions and lead out portions, where the second main portion is larger and has a corner open space to compensate for capacitance variations caused by overlapping areas, minimizing effective area variations and maintaining uniform connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the internal electrodes are stacked with standard overlapping areas, then the manufacturing process is simple, but capacitance variations occur due to effective area deviations
Solution Approach 1:
The patent applies asymmetry by making the second internal electrode larger than the first internal electrode. Specifically, the second main portion has a greater area than the first main portion, creating an asymmetric electrode structure. This asymmetric design compensates for capacitance variations caused by overlapping area deviations during stacking, thereby improving capacitance precision without requiring complex manufacturing processes
Solution Approach 2:
The patent applies local quality by creating a corner open space in the second main portion at a corner where the first lead out portion and second main portion would overlap. This localized modification (the corner open space) specifically addresses the capacitance variation problem in the overlapping region without affecting the overall electrode structure, thus improving capacitance precision while maintaining manufacturing simplicity
2Reliability
If the effective area of internal electrodes is controlled to minimize capacitance deviation, then capacitance stability improves, but the design complexity increases
Solution Approach 1:
The patent uses asymmetry by designing the second internal electrode with a greater area than the first internal electrode. The second main portion is specifically designed to be larger, which compensates for effective area variations during stacking. This asymmetric design improves capacitance stability by ensuring that capacitance variations due to stacking deviations are minimized, while the design remains relatively simple and manufacturable
Solution Approach 2:
The patent applies local quality by introducing a corner open space in the second main portion at the specific location where overlap with the first lead out portion occurs. This localized feature specifically addresses effective area variations in the critical overlapping region, improving capacitance stability without requiring complex overall electrode design changes
Data Source
AI summary
A multilayer ceramic capacitor includes a body including a dielectric layer and first and second internal electrodes alternately disposed with the dielectric layer interposed therebetween, and first and second external electrodes disposed on one surface of the body and respectively connected to the first and second internal electrodes. The first internal electrode includes a first main portion and a first lead out portion connecting the first main portion and the first external electrode, the second internal electrode includes a second main portion and a second lead out portion connecting the second main portion and the second external electrode, and the second main portion has a greater area than the first main portion and includes a corner portion defining an open space to compensate for a capacitance formed by an area in which the first lead out portion and the second main portion overlap each other.