Multilayer Coil Component Layered Dielectric Structure
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Solution Overview
Problem
Conventional multilayer coil components face a trade-off between reducing stray capacitance and ensuring the strength of the element body, as materials with low dielectric constants can compromise the structural integrity while improving Q characteristics in high frequency ranges.
Innovation Solution
The multilayer coil component incorporates a layered structure with a first resin layer containing a filler for strength and a second resin layer with a lower dielectric constant between the wiring portions and terminal electrodes, which connects the first and second wiring portions, thereby ensuring strength and reducing stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the element body is made of a material with a low dielectric constant, then stray capacitance is reduced and Q characteristic is improved, but the strength of the element body cannot be ensured
Solution Approach 1:
The element body is divided into multiple resin layers with different dielectric constants. The first resin layer has a lower dielectric constant to reduce stray capacitance, while the second resin layer has a higher dielectric constant to provide strength and structural stability. This segmentation allows each layer to fulfill its specific function without compromising the overall performance.
Solution Approach 2:
Different regions of the element body are assigned different material properties. The first resin layer (with lower dielectric constant) is positioned where stray capacitance reduction is most critical, while the second resin layer (with higher dielectric constant) is positioned to provide structural support. This local differentiation of material properties optimizes both electrical and mechanical performance.
2Object-generated harmful factors
If the element body is made of a material with a low dielectric constant, then stray capacitance formed between terminal electrodes and coil is reduced, but structural integrity is compromised
Solution Approach 1:
The element body is segmented into multiple resin layers with different dielectric constants. The first resin layer has a lower dielectric constant to reduce stray capacitance, while the second resin layer has a higher dielectric constant to provide strength and structural stability. This segmentation allows each layer to fulfill its specific function without compromising the overall performance.
Solution Approach 2:
The element body uses a composite structure of multiple resin layers with different dielectric constants. This composite material approach combines the advantages of low dielectric constant materials (reduced stray capacitance) with high dielectric constant materials (enhanced structural integrity), achieving both electrical performance and mechanical strength.
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 characteristic in high frequency ranges by minimizing stray capacitance while maintaining the structural integrity of the element body, preventing a decrease in self-resonant frequency and potential defects like breakage.
Implementation Method 1
at least one second resin layer having a lower dielectric constant than the first resin layer between the first wiring portion and the terminal electrodes
Data Source
AI summary
A multilayer coil component includes an element body including a main surface (a mounting surface) and a main surface, a pair of terminal electrodes disposed on the main surface of the element body, and a coil that is disposed in the element body and electrically connected to the pair of terminal electrodes, wherein the element body includes at least one element body layer containing a filler and at least one element body layer having a lower dielectric constant than the element body layer between a first wiring portion and the terminal electrodes.