Multilayer Coil Component With Low-Dielectric Layer
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Solution Overview
Problem
Multilayer coils face challenges in achieving both satisfactory mountability and radio-frequency characteristics, particularly in high-frequency bands, due to issues with stray capacitance and electrode placement.
Innovation Solution
A multilayer coil component design featuring a multilayer body with stacked insulating layers and coil conductors, where low-dielectric-constant layers are used between the body and outer electrodes to reduce stray capacitance, and the electrodes are strategically positioned to enhance mountability and radio-frequency performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If outer electrodes are provided on the mounting surface side of the multilayer coil, then mountability is improved, but stray capacitances are generated between the outer electrodes and inner conductors
Solution Approach 1:
A low-dielectric-constant layer is introduced as an intermediary between the outer electrode and the multilayer body. This intermediate layer has a relative dielectric constant of 5 or less, significantly lower than the insulating layers (relative dielectric constant of 10 or more), thereby reducing the stray capacitance between the outer electrode and inner conductors while maintaining good mountability through proper electrode placement.
2Object-generated harmful factors
If outer electrodes are not provided on the mounting surface side, then stray capacitances are reduced, but mountability deteriorates
Solution Approach 1:
The low-dielectric-constant layer serves as a mediator that enables the outer electrode to be placed on the mounting surface without significantly increasing stray capacitance. This resolves the contradiction by allowing good mountability through proper electrode placement while minimizing harmful capacitance effects through the use of the low-dielectric-constant material layer.
3Ease of manufacture
If conventional multilayer coil structures are used, then manufacturing is simple, but radio-frequency characteristics in high-frequency bands are not satisfactory
Solution Approach 1:
The relative dielectric constant parameter is changed by introducing a low-dielectric-constant layer with εr≤5 between the outer electrode and multilayer body. This parameter change reduces stray capacitance and improves radio-frequency characteristics in high-frequency bands (e.g., GHz band at frequencies ≥50 GHz) while maintaining the conventional multilayer manufacturing process.
Solution Approach 2:
The patent uses composite material structure combining the multilayer body with insulating layers and a separate low-dielectric-constant layer. This composite approach allows optimization of radio-frequency characteristics through material selection while maintaining manufacturing simplicity by integrating the low-dielectric-constant layer into the existing multilayer 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
The design achieves improved mountability and radio-frequency characteristics in high-frequency bands, with reduced stray capacitance and optimized transmission coefficients, making it suitable for applications like optical communication circuits.
Implementation Method 1
A low-dielectric-constant layer having a smaller relative dielectric constant than the insulating layers is provided between the multilayer body and a part of the first outer electrode that extends along the first main surface
Data Source
AI summary
A multilayer coil component includes a multilayer body formed by stacking a plurality of insulating layers in a length direction and that has a built-in coil, and first and second outer electrodes that are electrically connected to the coil. The coil is formed by a plurality of coil conductors stacked in the length direction being electrically connected to each other. The first and second outer electrodes respectively extend along and cover at least parts of first and second end surfaces and parts of a first main surface. A stacking direction of the multilayer body and a coil axis direction of the coil are parallel to the first main surface. A low-dielectric-constant layer having a smaller relative dielectric constant than the insulating layers is provided between the multilayer body and the part of the first outer electrode that extends along the first main surface.