Coil Component Corner Width Optimization for High Q Factor
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Solution Overview
Problem
The demand for miniaturized and high-Q coil components is increasing due to the miniaturization and thinning of IT devices, particularly in RF systems, where existing coil components face challenges in achieving both size reduction and high Q characteristics due to insufficient mounting space and increased current density at corner portions leading to resistance and parasitic capacitance issues.
Innovation Solution
A coil component design featuring a body with a coil track that includes corner portions with a greater line width than linear portions, and a radius of 0.008 mm to 0.016 mm, which helps in uniform current distribution and reduces resistance, thereby enhancing the Q factor by alleviating the skin effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the coil component is miniaturized to reduce mounting area, then the mounting area is reduced, but the Q characteristics deteriorate due to increased current density and resistance
Solution Approach 1:
The patent applies local quality by varying the line width of the coil track along its length. Specifically, the coil track has a first line width in linear portions and a second line width in corner portions, where the second line width is greater than the first. This local variation compensates for the increased current density at corner portions, maintaining uniform current distribution and preserving Q characteristics while enabling miniaturization.
2Reliability
If the line width of corner portions is increased to reduce resistance, then the Q factor is improved, but the overall coil size increases
Solution Approach 1:
The patent increases the line width only at corner portions where current density is highest, rather than uniformly increasing the line width throughout the entire coil track. This localized approach reduces resistance at critical areas while minimizing the overall coil size increase, thus improving Q factor without proportionally increasing coil volume.
3Reliability
If the radius of corner portions is optimized to 0.008 mm to 0.016 mm, then current distribution is improved and resistance is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies an optimized radius range of 0.008 mm to 0.016 mm for corner portions, which balances the improvement in current distribution and resistance reduction against manufacturing precision requirements. This parameter optimization ensures that the corner radius is sufficient to reduce current crowding effects while remaining feasible for standard manufacturing processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design increases the Q factor by up to 4.77% while maintaining inductance, with optimal line width adjustments preventing congestion at corner portions and improving inductance, thus addressing the miniaturization and high-Q requirements.
Implementation Method 1
an inductor, which is a component of a coil, is a representative passive element or coil component that forms an electronic circuit together with a resistor and a capacitor to remove noise, and is combined with the capacitor, using electromagnetic properties, to configure a resonance circuit amplifying a signal in a specific frequency band
Implementation Method 2
enhancing the Q factor by alleviating the skin effect
Data Source
AI summary
A coil component includes a body, a coil disposed inside of the body and forming one coil track when being viewed in a laminated direction, external electrodes disposed on an outer surface of the body. The coil track includes corner portions and linear portions connecting the respective corner portions to each other, and a line width of the corner portion is greater than that of the linear portion.