Multilayer Capacitor Electrode Segmentation for Wideband Impedance
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Solution Overview
Problem
Multilayer capacitors struggle to achieve low impedance over a wide frequency band due to their design, which limits their performance in current applications.
Innovation Solution
The design incorporates a capacitor body with specific arrangements of terminal and inner electrodes, including intermediate electrodes, to create multiple capacitance components connected in series and parallel, optimizing the arrangement of electrode portions to minimize equivalent series inductance and enhance capacitance differences across components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single capacitor component is used, then the structure is simple, but low impedance over a wide frequency band cannot be achieved
Solution Approach 1:
The capacitor is divided into multiple capacitor components (first and second capacitor components) with different capacitance values. Each component consists of alternating insulator layers and electrode layers, forming separate capacitive elements that are electrically connected in parallel. This segmentation allows each component to target different frequency ranges, collectively achieving low impedance across a wide frequency band while maintaining a relatively compact structure.
Solution Approach 2:
Different regions of the capacitor have different electrode area ratios to create distinct capacitance values. The first capacitor component has a first electrode area ratio while the second capacitor component has a second electrode area ratio that differs from the first. This local variation in electrode dimensions creates capacitance diversity within a single integrated structure, enabling wideband impedance reduction without requiring completely separate capacitor units.
2Length of moving object
If terminal electrodes are arranged on side faces, then current path is shortened, but equivalent series inductance reduction is limited
Solution Approach 1:
The electrode arrangement utilizes three-dimensional spatial optimization within the layered structure. By alternating electrode layers and insulator layers in the thickness direction while arranging terminal electrodes on side faces, the current path is shortened in multiple dimensions. The inner electrodes extend through multiple insulator layers, creating multiple parallel current paths that reduce equivalent series inductance more effectively than simple planar arrangements.
Solution Approach 2:
The electrode structure employs nested arrangements where inner electrodes are positioned within the capacitor body, surrounded by insulator layers and outer electrode layers. This nested configuration allows current to flow through multiple concentric paths, effectively reducing the equivalent series inductance by providing multiple parallel current channels within the compact capacitor structure.
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 effectively lowers impedance over a wide frequency band by shortening current paths and diversifying capacitance values, improving the capacitor's performance and frequency response.
Implementation Method 1
a first inner electrode connected to a first terminal electrode and disposed within the capacitor body; and a second inner electrode connected to a second terminal electrode and disposed within the capacitor body
Implementation Method 2
the capacitor body including a plurality of insulator layers laminated in the opposing direction of the pair of main faces
Data Source
AI summary
A multilayer capacitor includes a capacitor body having rectangular first and second main faces opposing each other, first and second end faces extending in a shorter side direction of the first and second main faces so as to connect the first and second main faces to each other, and first and second side faces extending in a longer side direction of the first and second main faces so as to connect the first and second main faces to each other. First and second terminal electrodes are arranged on the first and second side faces of the capacitor body, respectively. A first inner electrode connected to the first terminal electrode, a second inner electrode connected to the second terminal electrode, and first and second intermediate electrodes connected to none of the first and second terminal electrodes are arranged within the capacitor body. The first intermediate electrode and first inner electrode form a combined capacitance different from that formed by the second intermediate electrode and second inner electrode.