Coil Component Electrode Geometry for High Q Factor
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Solution Overview
Problem
High-frequency inductors require smaller and thinner designs with a high quality (Q) factor to reduce loss at application frequencies, while maintaining effective mounting and inspection capabilities, which existing designs struggle to achieve due to limitations in electrode geometry and magnetic flux interference.
Innovation Solution
The coil component features a body with internal coils and external electrodes designed in a concave-convex structure, where the electrodes have varying widths and line-symmetrical end surfaces to enhance adhesion, reduce magnetic flux blocking, and improve contact force, thereby maintaining a high Q factor and facilitating easier inspection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inductor size is reduced to meet mounting space requirements, then the inductor becomes smaller and thinner, but the quality factor decreases and loss increases
Solution Approach 1:
The external electrode structure is designed with different widths in different regions: a first width at the base portion and a second width (narrower) at the extending portion. This local variation in electrode geometry optimizes the distribution of current density and magnetic flux in different areas, reducing energy loss while maintaining compact size
Solution Approach 2:
The electrode design extends in the thickness direction with varying widths, utilizing three-dimensional space more effectively. The extending portion projects upward from the base portion, creating a stepped structure that optimizes magnetic flux distribution without increasing the planar footprint
2Ease of manufacture
If the external electrode width is uniform, then the manufacturing is simpler, but magnetic flux blocking occurs and Q factor decreases
Solution Approach 1:
The external electrode is designed with non-uniform width: the base portion has a first width while the extending portion has a second width that is narrower. This local variation prevents magnetic flux blocking by creating optimal current distribution paths, reducing energy loss while maintaining manufacturability through standard fabrication processes
3Area of stationary object
If the electrode extends fully to the edges of the body surface, then the contact area is maximized, but inspection becomes difficult and mounting is compromised
Solution Approach 1:
The extending portion of the external electrode is designed with a narrower width and is spaced apart from the edges of the body surface, creating a distinct visual boundary that facilitates inspection while maintaining sufficient contact area through the broader base portion
Solution Approach 2:
The external electrode is segmented into two functional portions: the base portion that provides substantial contact area and the extending portion that provides electrical connection while being spaced from edges. This segmentation resolves the conflict between contact area and inspectability
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 a high Q factor comparable to bottom electrode inductors, improves contact force and adhesion, and simplifies appearance inspection, outperforming L-shaped and bottom electrode inductors in terms of mounting and inspection challenges.
Implementation Method 1
an internal coil wound inside the body and including a first end and a second end
Implementation Method 2
first and second external electrodes respectively connected to the first and second ends and respectively disposed on first and second opposing surfaces of the body
Data Source
AI summary
A coil component includes a body including an internal coil and first and second external electrodes respectively disposed on outer surfaces of the body. The first and second external electrodes extend from a lower surface of the body to first and second end surfaces connected thereto, respectively. The first external electrode on the first end surface and the second external electrode on the second end surface each include a base portion and an extending portion extending from the base portion in a height direction, having a predetermined height, and having a width narrower than a width of the base portion.