Flexible Circuit Board With Narrower Line Width
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Solution Overview
Problem
The miniaturization trend of wireless devices necessitates a more compact flexible circuit board for high frequency signal transmission, as conventional coaxial cables occupy excessive space and existing flexible circuit boards are not sufficiently minimized.
Innovation Solution
A flexible circuit board design with reduced line width, featuring a signal line between grounds, dielectric layers, and via holes filled with conductors to connect grounds, where the signal line is laterally bent to minimize space and a shielding portion to prevent noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the line width of the flexible circuit board is reduced to minimize space, then the area occupied by the circuit board is decreased, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies dimensionality change by routing the signal line in a serpentine pattern rather than a straight line, transforming a one-dimensional width constraint into a two-dimensional area optimization. The signal line extends in the longitudinal direction with lateral bending, effectively utilizing both dimensions to achieve compact footprint while maintaining manageable line width.
Solution Approach 2:
The patent employs curvature by introducing lateral bending sections in the signal line path. Instead of a straight linear arrangement, the signal line includes curved or bent portions that allow it to navigate around via holes and ground references, enabling compact packaging while maintaining electrical performance and manufacturability.
2Area of stationary object
If via holes are positioned close to the signal line to reduce overall board size, then the area is minimized, but signal interference and noise increase
Solution Approach 1:
The patent applies local quality by introducing a ground reference line positioned adjacent to the signal line in specific segments. This localized grounding provides electromagnetic shielding exactly where the signal line is most vulnerable to interference, without requiring global shielding structures that would increase overall board area.
Solution Approach 2:
The patent uses a ground reference line as an intermediary element between the signal line and external interference sources. The ground reference acts as a shielding barrier that blocks electromagnetic noise from reaching the signal line, effectively mediating the interaction between the signal and environmental noise while maintaining compact layout.
3Ease of manufacture
If the signal line is routed in a straight line, then manufacturing is simpler, but the board requires more space
Solution Approach 1:
The patent transforms the manufacturing simplicity of straight lines into area efficiency by adding lateral bending in the longitudinal direction. The signal line maintains simple routing characteristics while incorporating serpentine patterns that utilize the longitudinal dimension to compress the overall footprint, achieving both ease of manufacture and compact size.
Data Source
AI summary
In one example, a flexible circuit board includes a signal line disposed between a first ground and a second ground; a dielectric disposed between the first ground and the signal line and between the second ground and the signal line; and via holes formed by filling a plurality of holes, which are formed in a vertical direction such that the first ground and the second ground are electrically connected, with conductors, wherein the signal line is laterally bent so as to be spaced apart from positions where the via holes are formed.