Coil Component Narrow External Electrodes Parasitic Capacitance
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Solution Overview
Problem
The existing thin-film coil components face issues with parasitic capacitance due to the proximity of the coil portion and external electrodes, which affects the magnetic body volume and inductance characteristics.
Innovation Solution
A coil component design that includes a support substrate, a coil portion, a body with specific surface configurations, and surface-insulating layers with narrower external electrodes to minimize parasitic capacitance and maintain magnetic body volume, featuring a hexahedral body with magnetic material and resin, and strategically positioned lead-out portions and external electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external electrode is formed on the outside of the body by the plating process, then the electrical connection is improved, but parasitic capacitance occurs between the coil portion and the external electrode
Solution Approach 1:
The external electrode is divided into two distinct parts: a first external electrode formed on the coil portion for electrical connection, and a second external electrode formed on the body for mechanical support. This segmentation separates the electrical function from the structural function, reducing parasitic capacitance while maintaining reliable electrical connection through the first electrode.
2Object-generated harmful factors
If the width of the external electrode is reduced to minimize parasitic capacitance, then the harmful effect is reduced, but the contact area between the body and external electrode is reduced
Solution Approach 1:
The external electrode structure is segmented into a first external electrode with narrow width (for minimizing parasitic capacitance on the coil portion) and a second external electrode with larger area (for providing sufficient contact area on the body). This allows each segment to be optimized for its specific function without compromise.
Solution Approach 2:
The external electrode extends in multiple dimensions: it has a narrow width in the dimension adjacent to the coil portion (to reduce capacitance) but extends in other dimensions on the body surface (to provide adequate contact area). This multi-dimensional configuration resolves the area-capacitance contradiction.
3Object-generated harmful factors
If the distance between the coil portion and external electrode is increased to reduce parasitic capacitance, then the harmful effect is reduced, but the overall device size increases
Solution Approach 1:
By segmenting the external electrode into first and second electrodes positioned at different locations, the design achieves effective capacitance reduction through strategic positioning rather than simply increasing distance everywhere. The first electrode maintains close proximity for connection while the second electrode provides separation for capacitance reduction.
Data Source
AI summary
A coil component includes a support substrate; a coil portion disposed on the support substrate; a body embedding the support substrate and the coil portion therein, and having a first surface and a second surface opposing each other, a third surface and a fourth surface opposing each other and respectively connecting the first and second surfaces; lead-out portions extending from the coil portion and respectively exposed from the third and fourth surfaces of the body; a surface-insulating layer disposed on the third and fourth surfaces of the body and having openings respectively exposing the lead-out portions; and external electrodes arranged on the surface-insulating layer and respectively connected to the lead-out portions respectively exposed through the openings, wherein a width of each of the external electrodes is narrower than a width of the body.