Multilayer Ceramic Capacitor Point-Symmetric Electrodes ESL Reduction
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in reducing equivalent series inductance (ESL) and increasing capacitance while maintaining insulating breakdown voltage, especially with the miniaturization of electronic devices, where the internal via structure often deteriorates ESL and ESR and decreases capacitance.
Innovation Solution
A multilayer ceramic capacitor design featuring point-symmetric internal electrodes with regions devoid of electrodes, connected by external electrodes, which increases the overlap area with the dielectric layer, thereby enhancing capacitance and offsetting mutual inductance to improve ESL, while maintaining or improving insulating breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an internal via structure is used to connect internal electrodes, then the capacitor can be miniaturized, but ESL and ESR deteriorate and capacitance decreases
Solution Approach 1:
The patent removes the internal via structure from the capacitor design. Instead of using through-holes filled with via electrodes to connect internal electrodes, the invention uses surface-only connection electrodes that extend from external electrodes to internal electrodes without penetrating the body. This extraction of the via structure eliminates the associated ESL and ESR problems while maintaining miniaturization benefits.
Solution Approach 2:
The patent inverts the conventional connection approach by placing connection electrodes on the surface rather than through the interior. Instead of internal vias penetrating the body to connect electrodes, the connection electrodes are positioned externally and connect to internal electrodes through the dielectric layer without forming through-holes, thereby improving electrical performance.
2Reliability
If the overlap area between internal electrodes and dielectric layer is increased to enhance capacitance, then capacitance increases, but the structure becomes more complex
Solution Approach 1:
The patent extends connection electrodes not only in the vertical direction (thickness direction) but also in the horizontal direction (width and length directions) beyond the edges of internal electrodes. This dimensional extension increases the overlap area between connection electrodes and dielectric layer, thereby increasing capacitance without requiring additional internal electrode layers or complex internal structures.
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 design effectively increases capacitance and reduces ESL, while maintaining or improving insulating breakdown voltage, making it suitable for compact electronic devices such as smartphones and embedded substrates.
Implementation Method 1
the first and second internal electrodes include a region in which an electrode is not disposed
Implementation Method 2
a body including a dielectric layer and first and second internal electrodes disposed with the dielectric layer interposed therebetween
Implementation Method 3
a body including a dielectric layer and first and second internal electrodes disposed with the dielectric layer interposed therebetween
Data Source
AI summary
A multilayer ceramic capacitor includes a body including a dielectric layer and first and second internal electrodes disposed with the dielectric layer interposed therebetween and disposed in point-symmetry with each other; first and second connection electrodes penetrating the body in a direction perpendicular to the dielectric layer and connected to the first internal electrode; third and fourth connection electrodes penetrating the body in a direction perpendicular to the dielectric layer and connected to the second internal electrode; first and second external electrodes disposed on both surfaces of the body and connected to the first and second connection electrodes; and third and fourth external electrodes spaced apart from the first and second external electrodes and connected to the third and fourth connection electrodes, and the first and second internal electrodes include a region in which an electrode is not disposed.