Multilayer Ceramic Capacitor Electrode Geometry for GHz ESR Control
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Solution Overview
Problem
Existing capacitors face challenges in achieving low equivalent series resistance across a broad range of frequencies, particularly at high frequencies, which is crucial for modern electronic applications.
Innovation Solution
A multilayer ceramic capacitor with a unique electrode configuration and specific material selection, featuring a monolithic body with alternating dielectric and electrode layers, and a Y-shaped electrode configuration that reduces equivalent series resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrode configurations are used in multilayer ceramic capacitors, then manufacturing is simpler, but equivalent series resistance increases at high frequencies
Solution Approach 1:
The electrode is divided into multiple segments (first electrode segment, second electrode segment, third electrode segment) arranged in a specific pattern. This segmentation allows optimization of current distribution and reduction of equivalent series resistance at high frequencies while maintaining manufacturability through standardized layering processes.
Solution Approach 2:
The electrode configuration employs asymmetric arrangement where the first electrode segment is positioned differently relative to dielectric layers compared to the second and third segments. This asymmetric design optimizes the current path and reduces parasitic inductance, thereby lowering equivalent series resistance without significantly complicating the manufacturing process.
2Speed
If high-capacitance coupling capacitors are designed for high-frequency applications, then performance characteristics improve, but equivalent series resistance becomes increasingly problematic
Solution Approach 1:
The electrode configuration extends in multiple dimensions within the capacitor structure, with electrodes arranged across different layers and positions. This multi-dimensional arrangement reduces current path length and parasitic inductance, enabling high-frequency operation with low equivalent series resistance while maintaining high capacitance values.
Data Source
AI summary
The present invention is directed to a multilayer ceramic capacitor. The multilayer ceramic capacitor has a first end and a second end that is spaced apart from the first end in a longitudinal direction that is perpendicular to a lateral direction wherein the lateral direction and longitudinal direction are each perpendicular to a Z-direction. The multilayer ceramic capacitor comprises a monolithic body comprising a plurality of dielectric layers and a plurality of electrode layers parallel with the lateral direction. At least one electrode layer includes a first electrode comprising a connecting portion and a central portion extending from the connecting portion in the longitudinal direction wherein the central portion includes a Z-directional edge and the connecting portion includes an edge extending in both the longitudinal direction and the Z-direction and wherein the Z-directional edge of the central portion forms a first angle of from greater than 90° to less than 180° with the edge of the connecting portion. A first external termination disposed along the first end and a second external termination disposed along the second end.