Multilayer Coil Layout for GHz Impedance and Deflection Resistance
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Solution Overview
Problem
Existing multilayer coil components face issues with insufficient impedance characteristics in high-frequency regions and inadequate resistance to deflection, particularly in GHz bands and when subjected to mechanical stress.
Innovation Solution
A multilayer coil component design with a specific aspect ratio (L/W < 1) and strategic placement of outer electrodes and coil conductors, along with a gap between insulating layers and coil conductors, to minimize stray capacitance and enhance mechanical resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the multilayer coil component uses a conventional configuration with laminated insulating layers and coil conductors, then the basic structural integrity is maintained, but the impedance characteristics in high-frequency regions become insufficient
Solution Approach 1:
The patent introduces a gap portion between the insulating layer and coil conductor at specific locations where stray capacitance occurs. This localized modification creates different electrical properties in different regions of the component - the gap area has reduced capacitance while other areas maintain normal lamination, thereby improving high-frequency impedance characteristics without compromising overall structural integrity
Solution Approach 2:
The patent extracts or removes the insulating material in specific regions to create gap portions between the insulating layer and coil conductors. By taking out the insulating material where it contributes to harmful stray capacitance, the design reduces parasitic effects while maintaining the necessary insulation elsewhere, thus improving high-frequency performance
2Reliability
If the multilayer coil component is mounted on a substrate, then electrical connectivity is achieved, but the component exhibits insufficient resistance to deflection under mechanical stress
Solution Approach 1:
The patent introduces gap portions between insulating layers and coil conductors beforehand, which act as cushioning spaces that can absorb mechanical stress during mounting and operation. These pre-designed gaps prevent stress concentration that would otherwise occur at rigid interfaces, thereby protecting the component from deflection damage while maintaining electrical functionality
3Reliability
If the coil conductors are tightly laminated with insulating layers, then structural stability is improved, but stray capacitance increases reducing high-frequency performance
Solution Approach 1:
The patent removes insulating material to create gap portions between the insulating layer and coil conductors at specific locations. By extracting the insulating material where it creates harmful stray capacitance, the design reduces parasitic capacitance effects while maintaining necessary insulation in other critical areas, thereby improving high-frequency impedance characteristics
Solution Approach 2:
The patent converts the potentially harmful tight lamination that creates stray capacitance into a beneficial structure by intentionally creating controlled gaps. These gaps, which might seem to reduce structural stability, actually reduce stray capacitance and improve high-frequency performance by eliminating capacitive coupling between adjacent conductive elements
Data Source
AI summary
A multilayer coil component includes a multilayer body including laminated insulating layers, a coil including electrically connecting coil conductors laminated together with the insulating layers, and first and second outer electrodes electrically connected to the coil. The body has first and second end surfaces opposing each other in a length direction in which the first and second outer electrodes face each other, first and second main surfaces opposing each other in a height direction orthogonal to the length direction, and first and second side surfaces opposing each other in a width direction orthogonal to the length direction and the height direction. The second main surface is a mounting surface. A lamination direction of the body and a coil axis of the coil are along the length direction, and a relationship between a length dimension L and a width dimension W of the body is L/W<1.