Arc-Shaped Coil Patterns for High-Frequency Q Factor Improvement
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Solution Overview
Problem
High-frequency coil components face challenges in achieving high quality factor (Q) characteristics due to material limitations and require optimization of shape and structure to reduce resistance and improve inductance.
Innovation Solution
A coil component design featuring insulating layers with arc-shaped coil patterns and tangent connection portions, reducing resistance and enhancing Q characteristics by minimizing edge effects and optimizing coil shape and via placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional coil pattern with straight edges is used, then the manufacturing process is simple, but the quality factor (Q) characteristics are poor due to increased resistance
Solution Approach 1:
The patent applies curvature by replacing straight edges with arc-shaped connections between coil segments. Specifically, the connection portions between adjacent coil segments are formed with arc shapes having a predetermined radius of curvature, which reduces edge effects and skin effect at high frequencies, thereby lowering resistance and improving Q characteristics without significantly complicating the manufacturing process
Solution Approach 2:
The patent changes geometric parameters of the coil pattern, specifically introducing arc radius as a new parameter. The connection portions are designed with arc shapes having a predetermined radius of curvature, and the width of these connection portions is optimized to balance between reducing resistance and maintaining manufacturability, thus improving Q characteristics while keeping the design practical
2Volume of moving object
If the coil component is miniaturized for high frequency operation, then the device size is reduced, but the quality factor (Q) characteristics deteriorate due to increased resistance
Solution Approach 1:
The arc-shaped connection portions reduce resistance by minimizing edge effects and skin effect, which is particularly important for miniaturized high-frequency coils where resistance becomes a dominant factor. The curved geometry allows for smoother current flow paths, reducing energy loss and improving Q characteristics in compact designs
Solution Approach 2:
The patent introduces vertical stacking of multiple coil segments on different insulating layers, transitioning from a planar to a three-dimensional structure. This allows the coil to achieve the required inductance in a smaller footprint while the arc-shaped connections maintain low resistance, thus improving Q characteristics in miniaturized devices
3Reliability
If photolithography method is used to achieve low specific resistance, then the material characteristics are optimized, but the quality factor (Q) is still limited by the coil shape and structure
Solution Approach 1:
The arc-shaped connection portions complement the photolithography method by addressing the geometric limitations of conventional straight-edge patterns. The curved geometry reduces resistance through minimized edge effects and optimized current distribution, working synergistically with low-specific-resistance materials to achieve superior Q characteristics
Solution Approach 2:
The patent applies different geometric characteristics to different parts of the coil pattern: arc-shaped connections at the joints between segments and straight or curved segments in between. This local optimization of geometry addresses the specific problem of high resistance at connection points without requiring complete redesign of the entire coil structure
Data Source
AI summary
A coil component may include a body including a plurality of insulating layers having coil patterns disposed on the plurality of insulating layers. The coil pattern may include a coil portion, a leading portion disposed on one side of the insulating layer, and a connection portion connecting the coil portion and the leading portion, a pattern line of the coil portion may have an arc shape, and the connection portion may be formed in a tangent line direction of the coil portion from one end of the leading portion.