Multilayer Coil Component Stray Capacitance Reduction
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Solution Overview
Problem
Existing multilayer inductor components fail to provide satisfactory radio-frequency characteristics, especially in the GHz band, due to complex manufacturing methods and reduced coil turns per unit volume, which affects their performance as noise absorbing components.
Innovation Solution
A multilayer coil component is designed with a stacked structure of insulating layers and coil conductors, featuring expanded regions with larger line widths and strategically positioned outer electrodes to reduce stray capacitance and enhance radio-frequency characteristics, while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of via sheets connected between coil conductors is increased to adjust the distance between coil conductors, then the distance between coil conductors can be controlled, but the manufacturing method becomes complicated and the number of turns of the coil per unit volume decreases
Solution Approach 1:
The patent extracts the function of distance adjustment from the via sheets and transfers it to the insulating layers. By controlling the thickness of insulating layers between coil conductors, the distance is adjusted without requiring multiple via sheets, thus simplifying the manufacturing method while maintaining manufacturing precision.
Solution Approach 2:
The patent changes the parameter of insulating layer thickness to control the distance between coil conductors. This parameter change approach allows precise distance control through a single structural modification rather than adding multiple components, reducing manufacturing complexity.
2Manufacturing precision
If the number of via sheets connected between coil conductors is increased to adjust the distance between coil conductors, then the distance between coil conductors can be controlled, but the number of turns of the coil per unit volume decreases
Solution Approach 1:
The patent extracts the distance control function from the via sheets and assigns it to the insulating layers. This eliminates the need for multiple via sheets, allowing more coil turns to be packed into the same volume while maintaining precise distance control through insulating layer thickness.
Solution Approach 2:
The patent moves the distance control mechanism from the vertical stacking dimension (multiple via sheets) to the lateral thickness dimension (insulating layer thickness). This dimensional shift allows better space utilization and increases the number of turns per unit volume.
3Reliability
If the winding interval between turns is monotonically decreased from one end to the other end, then changes in impedance are suppressed and signal reflection is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making the insulating layer thickness vary at different positions along the coil. The insulating layer thickness is set to be different in first and second regions, creating local variations that achieve monotonic winding interval reduction without complex overall structural changes, thus maintaining impedance stability.
Solution Approach 2:
The patent changes the insulating layer thickness parameter across different regions to achieve the desired winding interval variation. This parameter change approach simplifies the winding structure complexity by using a controlled gradient in insulating layer thickness rather than complex winding patterns.
Data Source
AI summary
A multilayer coil component that includes a multilayer body formed by stacking a plurality of insulating layers on top of one another and that has a coil built into the inside thereof; and a first outer electrode and a second outer electrode that are electrically connected to the coil. The coil is formed by electrically connecting a plurality of coil conductors, which are stacked together with insulating layers, to one another. A first main surface of the multilayer body is a mounting surface. A stacking direction of the multilayer body and an axial direction of the coil are parallel to the mounting surface. At least one of the coil conductors is provided with an expanded region that has a line width that is larger than a coil line width in a plan view from the stacking direction.