Multilayer Capacitor Terminal Segmentation for Low Inductance
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Solution Overview
Problem
Multilayer capacitors face challenges in further reducing equivalent series inductance to accommodate higher frequency circuits, as existing designs are limited in their ability to lower impedance effectively.
Innovation Solution
The design incorporates a multilayer capacitor with a conduction path formed within the outer layer portion, connecting different positions of terminal electrodes, which shunts current and reduces equivalent series inductance by utilizing lead conductors and through hole conductors to create multiple shunt paths, thereby shortening the conduction path length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal electrodes are arranged with adjacent electrodes having opposite polarities to cancel magnetic fields, then equivalent series inductance is lowered, but further reduction of equivalent series inductance cannot be achieved
Solution Approach 1:
The terminal electrode is divided into multiple segments (first terminal electrode and second terminal electrode) that are electrically insulated from each other. Each segment connects to different inner electrodes (first inner electrodes and second inner electrodes respectively), creating separate conduction paths. This segmentation allows current to be distributed across multiple paths, reducing the overall equivalent series inductance and enabling adaptation to higher frequency circuits.
2Reliability
If conventional terminal electrode arrangement is used, then magnetic field cancellation is achieved, but conduction path length remains too long for high-frequency applications
Solution Approach 1:
The conduction path is extended into the thickness direction of the multilayer body by forming through-hole conductors that penetrate the dielectric layers. This dimensional change allows current to flow through the thickness of the capacitor rather than only along the lateral surface, significantly shortening the effective conduction path length and reducing equivalent series inductance for high-frequency performance.
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 approach effectively lowers the equivalent series inductance, enhancing the capacitor's performance in high-frequency circuits by creating multiple shunt paths that reduce impedance and inductance, making it suitable for higher frequency applications.
Implementation Method 1
a conduction path electrically connecting a plurality of different positions in at least one of the plurality of terminal electrodes to each other is formed within the outer layer portion
Implementation Method 2
arranges a plurality of terminal electrodes such that those adjacent to each other have polarities opposite to each other, so that magnetic fields generated thereby cancel each other out, thereby lowering the equivalent series inductance
Data Source
AI summary
A multilayer capacitor comprises a multilayer body and a plurality of terminal electrodes formed on a side face of the multilayer body. The multilayer body includes an inner layer portion in which a plurality of dielectric layers and a plurality of inner electrodes are alternately laminated, and an outer layer portion in which a plurality of dielectric layers are laminated. In the outer layer portion, a conduction path electrically connecting a plurality of different positions in at least one of the plurality of terminal electrodes to each other is arranged. A current flowing through the terminal electrode electrically connected to the conduction path is shunted into the conduction path. This lowers the equivalent series inductance of the multilayer capacitor.