Multilayer Coil Component Stray Capacitance Reduction
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Solution Overview
Problem
Conventional common mode noise filters with spiral-shaped coils exhibit high stray capacitance due to large overlapping areas, leading to decreased high-frequency characteristics.
Innovation Solution
A multilayer-type coil component with first and second coils having conductors shorter than one turn, laminated in a specific direction, and insulated from each other, with outer electrodes connected to the coils to reduce overlapping areas and stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spiral-shaped conductors are used for coils, then the coil structure is simple and easy to manufacture, but the overlapping area between conductors is large causing high stray capacitance
Solution Approach 1:
The patent divides the coil conductors into multiple segments arranged in different layers. Instead of using continuous spiral conductors that overlap extensively, the coil is segmented into multiple conductor sections (first conductor section, second conductor section, etc.) that are distributed across multiple insulator layers, reducing the overlapping area between conductors of the same coil and between different coils.
Solution Approach 2:
The patent transitions from a two-dimensional spiral conductor layout to a three-dimensional multilayer structure. By arranging conductor segments across multiple insulator layers stacked in the vertical direction, the design reduces planar overlap area while maintaining the required inductance, thereby reducing stray capacitance between conductors.
2Reliability
If large overlapping area between coils is used, then the inductance is sufficient, but the stray capacitance increases decreasing high frequency characteristics
Solution Approach 1:
The patent employs a nested multilayer structure where insulator layers are stacked with conductor segments embedded within them. The conductor segments are positioned within the insulator layers in a nested arrangement that minimizes overlap between adjacent coils while maintaining the magnetic coupling necessary for sufficient inductance.
Solution Approach 2:
The patent applies different conductor arrangements to different regions and layers. By optimizing the local configuration of conductor segments in each insulator layer and their relative positions, the design achieves sufficient inductance through controlled magnetic coupling while minimizing stray capacitance by reducing overlapping areas in critical regions.
Data Source
AI summary
A multilayer-type coil component including an element body including insulating layers laminated in a laminating direction; first and second coils inside the element body and insulated from each other; first and second outer electrodes on a surface of the element body and electrically connected to the first coil; third and fourth outer electrodes on the surface of the element body and electrically connected to the second coil. The laminating direction, and respective directions of coil axes of the first and second coils are parallel to a mount surface of the element body along a same direction. The first and second coils include first and second coil conductors, respectively, laminated in the laminating direction. Each of the first coil conductors has a length smaller than one turn of the first coil. Each of the second coil conductors has a length smaller than one turn of the second coil.