Segmented Inductor Coil Layout for Lower Parasitic Capacitance
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Solution Overview
Problem
The winding method of eight-shaped inductor devices results in significant parasitic capacitance between coils, severely affecting the quality factor (Q) and self-resonant frequency, necessitating a solution to improve these performance metrics.
Innovation Solution
The inductor device comprises a first coil and a second coil with specific circle configurations and connection members, where at least two circles of each coil are located in distinct areas, with connection members coupling circles across these areas, effectively reducing parasitic capacitance and enhancing the quality factor by shifting the self-resonant frequency to a higher frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the traditional eight-shaped winding method is used, then the inductor device can be manufactured with simple structure, but the parasitic capacitance between coils becomes large which seriously affects the quality factor
Solution Approach 1:
The inductor coil is divided into multiple independent circular loops instead of continuous eight-shaped winding. Each circular loop is formed by depositing conductive material in a circular pattern, creating discrete segments that reduce capacitive coupling between adjacent windings while maintaining the overall inductance value.
Solution Approach 2:
The patent transitions from planar eight-shaped winding to three-dimensional stacked circular loops with vertical separation. Multiple layers of circular loops are stacked vertically with insulating layers between them, utilizing the third dimension (height) to spatially separate conductive elements and minimize parasitic capacitance.
2Device complexity
If the eight-shaped winding method is used, then the device structure remains simple, but the self-resonant frequency occurs at lower frequencies which reduces operational performance
Solution Approach 1:
The continuous eight-shaped winding is segmented into discrete circular loops distributed across multiple layers. This segmentation changes the distributed capacitance and inductance characteristics of the coil, pushing the self-resonant frequency to higher values and expanding the usable frequency range for RF applications.
Solution Approach 2:
Insulating layers and spacing structures are introduced as intermediary elements between adjacent circular loops. These intermediaries increase the electrical distance between conductive elements, reducing parasitic capacitance and thereby increasing the self-resonant frequency without requiring changes to the fundamental circular loop geometry.
Data Source
AI summary
An inductor device includes a first coil and a second coil. The first coil includes a first connection member and a plurality of first circles. At least two first circles of the first circles are located at a first area, and half of the first circle of the first circles is located at a second area. The second coil includes a second connection member and a plurality of second circles. At least two second circles of the second circles are located at the second area, and half of the second circle of the second circles is located at the first area. The first connection member is coupled to the at least two first circles and the half of the first circle. The second connection member is coupled to the at least two second circles and the half of the second circle.