Offset Coil Pattern Layout for Low-Capacitance Inductor Components
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Solution Overview
Problem
Inductor components with a coil conductor inside an element body face challenges in maintaining a high Q factor due to increased stray capacitance when narrowing the interval between conductor patterns, which lowers the self resonant frequency.
Innovation Solution
The inductor component incorporates a coil conductor with conductor patterns arranged on virtual inner surfaces at intervals, featuring coupling conductors that electrically connect adjacent patterns, and includes first and second conductor patterns with centers offset in the axial direction to reduce facing areas and stray capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the interval between conductor patterns is narrowed to increase thickness without increasing element body size, then the conductor pattern thickness increases, but stray capacitance increases and self resonant frequency decreases
Solution Approach 1:
The conductor patterns are designed with asymmetric configurations where adjacent patterns are offset from each other in the axial direction. This asymmetry reduces the facing area between adjacent conductor patterns, thereby decreasing stray capacitance while maintaining the required conductor thickness for high Q factor performance.
Solution Approach 2:
The offset arrangement of conductor patterns in the axial direction introduces a dimensional variation that reduces the effective facing area between patterns. By utilizing the axial dimension for offset positioning rather than maintaining alignment, the design achieves reduced stray capacitance without compromising conductor thickness.
2Length of stationary object
If the interval between conductor patterns is narrowed to increase thickness without increasing element body size, then the conductor pattern thickness increases, but self resonant frequency decreases
Solution Approach 1:
The asymmetric offset configuration of conductor patterns minimizes the facing area between adjacent patterns, reducing stray capacitance generation. This maintains the self resonant frequency at a high level while achieving the necessary conductor thickness for improved Q factor and reliable inductor performance.
Solution Approach 2:
The design accepts the narrow interval between conductor patterns as a given constraint but converts the potential harm (stray capacitance) into a benefit by using the offset arrangement to reduce facing area. This transforms what would be a harmful effect into an opportunity to maintain both thickness and high self resonant frequency.
3Reliability
If conductor patterns are arranged to increase thickness within limited element body size, then the Q factor improves, but stray capacitance generation increases
Solution Approach 1:
Adjacent conductor patterns are offset from each other in the axial direction, creating an asymmetric arrangement that reduces the facing area between patterns. This asymmetry decreases stray capacitance generation while maintaining the conductor thickness necessary for high Q factor, thus resolving the contradiction between improving Q factor and reducing stray capacitance.
Data Source
AI summary
An inductor component includes an element body made of an insulator and a coil conductor inside the element body. The coil conductor includes conductor patterns on a plurality of respective virtual inner surfaces arranged at intervals in an axial direction of the coil conductor to form a portion of an annular track, and a coupling conductor electrically coupling two adjacent conductor patterns among the conductor patterns. At least one conductor pattern among the conductor patterns includes a first conductor pattern and a second conductor pattern that are arranged in the axial direction and are in contact with each other. In a section including an axis of the coil conductor, a center of the first conductor pattern in a direction orthogonal to the axial direction is present at a position different from a position of a center of the second conductor pattern in the direction orthogonal to the axial direction.