Coil Component Lower Surface Electrodes Stray Capacitance
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Solution Overview
Problem
Existing coil components with embedded coil conductors in composite materials face challenges with high-density mounting and increased stray capacitance due to outer electrodes' placement on side surfaces.
Innovation Solution
A coil component design with a coil conductor embedded in an element assembly containing a filler and resin material, where the coil axis is parallel to the mounting surface, and outer electrodes are disposed on the lower surface, reducing stray capacitance by eliminating lateral extension portions and using a glass layer to enhance insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outer electrodes are located on both end surfaces of the coil component, then insulation between adjacent components can be ensured, but high-density mounting becomes difficult and stray capacitance between the outer electrode and coil conductor increases
Solution Approach 1:
The outer electrodes are moved from the end surfaces to the lower surface of the coil component, changing the spatial dimension of electrode placement. This dimensional repositioning allows the electrodes to be located on the mounting surface, enabling high-density mounting while maintaining insulation through the element assembly structure.
Solution Approach 2:
The element assembly composed of composite material containing metal particles and resin material acts as an intermediary between the coil conductor and the outer electrodes. This intermediary structure provides insulation while allowing electrical connection, resolving the conflict between insulation requirements and mounting density.
2Reliability
If outer electrodes are located on both end surfaces of the coil component, then insulation between adjacent components can be ensured, but stray capacitance between the outer electrode and coil conductor increases
Solution Approach 1:
Relocating the outer electrodes to the lower surface changes the spatial relationship between electrodes and coil conductors, reducing the proximity and thus minimizing stray capacitance effects while maintaining insulation functionality.
Solution Approach 2:
The element assembly serves as an insulating intermediary that reduces the electric field coupling between outer electrodes and coil conductors, thereby minimizing stray capacitance while ensuring proper insulation between adjacent components.
3Ease of manufacture
If the coil component is designed for traditional mounting orientation, then manufacturing is simplified, but the component size cannot be reduced and mounting density is limited
Solution Approach 1:
The coil axis is oriented parallel to the mounting surface rather than perpendicular, and outer electrodes are positioned on the lower surface. This dimensional reconfiguration enables smaller component footprint and higher mounting density while maintaining manufacturability through standard compression molding processes.
Data Source
AI summary
A coil component including an element assembly that contains a filler and a resin material, a coil portion composed of a coil conductor that is embedded in the element assembly, and a pair of outer electrodes electrically connected to the coil conductor. The outer electrodes are disposed on a lower surface, and the coil axis of the coil portion is parallel to a mounting surface.