Multilayer Capacitor Electrode Segmentation for Q-Factor Stability
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Solution Overview
Problem
Conventional multilayer capacitors with high Q-factors suffer from significant capacitance variation due to lamination deviations of internal electrodes, which is particularly problematic for capacitors with small capacitance values, as they have a limited permissible tolerance.
Innovation Solution
The design incorporates a major capacitance forming portion and multiple minor capacitance forming portions, where internal electrodes connected to opposite polarities are arranged in a specific pattern to increase the number of electrodes contributing to capacitance, thereby reducing resistance and maintaining capacitance stability despite deviations in electrode arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of laminated internal electrodes is increased to achieve higher Q-factor, then the resistance decreases and Q-factor increases, but the lamination deviation of internal electrodes becomes more significant causing capacitance variation
Solution Approach 1:
The capacitance forming structure is segmented into multiple independent capacitance units (first capacitance unit with first and second internal electrodes, second capacitance unit with third and fourth internal electrodes). Each unit contributes to the total capacitance independently, allowing the system to achieve high Q-factor with fewer electrodes while reducing sensitivity to lamination deviations
Solution Approach 2:
Dielectric layers are introduced as intermediary elements between the internal electrodes to form distinct capacitance units. These dielectric layers provide electrical isolation and define clear capacitance boundaries, enabling the segmented capacitance structure to function effectively while reducing the impact of electrode position deviations
2Object-generated harmful factors
If internal electrodes are arranged in alternating pattern connected to opposite terminal electrodes, then the number of current-carrying electrodes increases and resistance decreases, but capacitance variation becomes significant due to lamination deviation
Solution Approach 1:
The electrode arrangement is segmented into pairs (first and second internal electrodes forming one capacitance unit, third and fourth internal electrodes forming another capacitance unit) rather than continuous alternating patterns. This segmentation reduces the cumulative effect of lamination deviations on total capacitance while maintaining multiple current paths
Solution Approach 2:
Instead of connecting internal electrodes in a continuous alternating pattern to terminal electrodes, the invention inverts the approach by forming discrete capacitance units with paired electrodes that are electrically isolated by dielectric layers. This inverted structure reduces sensitivity to electrode position variations
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 configuration enhances the Q-factor while minimizing capacitance variation, ensuring that the capacitance remains within tolerance even for small capacitance values, by distributing the impact of electrode deviations across multiple minor capacitance forming portions.
Implementation Method 1
an element body formed in a nearly rectangular parallelepiped shape; and at least a pair of terminal electrodes formed on respective end faces opposed to each other in the element body, and having opposite polarities, wherein the element body includes a major capacitance forming portion to form a capacitance
Data Source
AI summary
An element body has a major capacitance forming portion to form a first capacitance, and a minor capacitance forming portion to form a plurality of second capacitances smaller than the first capacitance. The major capacitance forming portion includes a first internal electrode connected to a first terminal electrode, and a second internal electrode opposed to the first internal electrode and connected to a second terminal electrode. The minor capacitance forming portion includes a third internal electrode connected to the first terminal electrode, a fourth internal electrode arranged as separated from the third internal electrode in an identical layer and connected to the second terminal electrode, a fifth internal electrode opposed to the third and fourth internal electrodes and connected to the first terminal electrode, and a sixth internal electrode opposed to the third and fourth internal electrodes and opposed to the fifth internal electrode through a region between the third and fourth internal electrodes, and connected to the second terminal electrode.