Multilayer Capacitor with Segmented Internal Electrodes for Wideband Impedance Control
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Solution Overview
Problem
Existing multilayer capacitors struggle to achieve low impedance over a wider frequency band, as they are limited by the fixed positions and distances of internal electrodes, which restrict the variability of self-resonant frequencies and impedance characteristics.
Innovation Solution
The multilayer capacitor design incorporates multiple types of internal electrodes with varying lead positions and distances, along with narrower interconnection portions, to create multiple self-resonant frequencies and series-connected capacitance components, allowing for a wider range of impedance control across frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple types of first internal electrodes with different lead positions are used, then low impedance over a wider frequency band is achieved, but the device complexity increases
Solution Approach 1:
The first internal electrode is divided into multiple types (first, second, third, fourth) with different lead positions and capacitance values. Each type creates a distinct capacitance component with different self-resonant frequencies, segmenting the frequency response into multiple low-impedance bands that collectively cover a wider frequency range.
Solution Approach 2:
Different regions of the capacitor have different electrode configurations. The first internal electrodes have varying lead positions (first lead portion, second lead portion, third lead portion) that create local variations in equivalent series inductance, while the second internal electrode has a unified structure. This local differentiation enables tailored impedance characteristics across different frequency bands.
2Reliability
If the width of interconnection portion is reduced, then magnetic separation between second main electrode portions is improved and self-resonant frequencies are further separated, but the manufacturing precision requirement increases
Solution Approach 1:
The width of the interconnection portion is specifically controlled to be smaller than the width of the second main electrode portions. This parameter change creates magnetic separation between adjacent second main electrode portions, preventing magnetic coupling that would otherwise cause unwanted resonance and reduce the effectiveness of the multiple self-resonant frequency design.
3Adaptability or versatility
If distances from first lead portions to second lead portion are varied, then equivalent series inductances and self-resonant frequencies are diversified, but the device complexity increases
Solution Approach 1:
The first internal electrodes are segmented into four distinct types with progressively different lead positions and capacitance values. This segmentation creates four different capacitance components, each with unique equivalent series inductance and self-resonant frequency characteristics, enabling the capacitor to maintain low impedance across four different frequency bands.
Solution Approach 2:
The first internal electrodes exhibit asymmetric configurations with different lead positions (first lead portion connected to first terminal electrode, second lead portion connected to second terminal electrode, third lead portion connected to first terminal electrode). This asymmetry creates deliberate variations in equivalent series inductance that, combined with different capacitance values, generate diversified self-resonant frequencies.
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
This design effectively achieves low impedance over a wider frequency band by varying the self-resonant frequencies and equivalent series inductances, ensuring a broader range of impedance characteristics.
Implementation Method 1
a first internal electrode and a second internal electrode are laminated as opposed to each other with a dielectric layer (21) in between
Implementation Method 2
the equivalent series inductance of the capacitor becomes smaller with decreasing distance between the first lead portion of the first internal electrode and the second lead portion of the second internal electrode
Data Source
AI summary
There are a plurality of types of first internal electrodes and each type of first internal electrode includes a first main electrode portion and a first lead portion. A second internal electrode includes a plurality of second main electrode portions forming respective capacitance components with the respective types of first internal electrodes, an interconnection portion connecting between each pair of second main electrode portions, and a second lead portion. Positions of the first lead portions of the respective types of first internal electrodes are different from each other and distances from the first lead portions of the respective types of first internal electrodes to the second lead portion are different from each other. The width of the interconnection portion is smaller than the width of at least one second main electrode portion out of the plurality of second main electrode portions.