Four-Layer Flexible Cable Structure for Higher Bandwidth
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Solution Overview
Problem
Traditional flexible electrical cables with two copper layers are limited in bandwidth due to fabrication constraints, making it impractical to increase the number of active traces without compromising flexibility or introducing unwanted electrical interference.
Innovation Solution
The implementation of a flexible electrical cable with four copper layers, where at least two copper layers are separated by a polymeric base layer and an adhesive, allowing for increased trace capacity while maintaining mechanical flexibility and reducing cross-talk through proper shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional two copper layer configuration is used, then manufacturing simplicity is maintained, but bandwidth is limited
Solution Approach 1:
The patent transitions from a two-layer copper configuration to a four-layer copper configuration by adding dimensional complexity in the form of multiple stacked copper layers separated by polymeric base layers. This dimensional expansion enables increased trace capacity and bandwidth while maintaining cable flexibility through the use of thin, flexible polymeric separators.
2Productivity
If more copper layers are added to increase trace capacity, then bandwidth increases, but mechanical flexibility deteriorates
Solution Approach 1:
The patent employs thin polymeric base layers as flexible separators between copper layers, and flexible adhesive layers to bond the cores together. These flexible interlayers maintain the cable's ability to bend and flex while supporting the increased trace capacity provided by the four copper layers, thus resolving the contradiction between trace capacity and mechanical flexibility.
3Ease of operation
If copper layers are placed closer together to maintain flexibility, then mechanical flexibility is maintained, but electrical interference increases
Solution Approach 1:
The patent introduces polymeric base layers and adhesive layers as intermediary materials between the copper layers. These intermediaries provide electrical insulation that reduces cross-talk and electromagnetic interference between adjacent copper layers, while their thin, flexible nature preserves the cable's mechanical flexibility. This intermediary approach resolves the contradiction between maintaining flexibility and reducing electrical interference.
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
This configuration enables higher bandwidth and signal integrity, allowing for reliable transmission of data at higher speeds, such as 800-1000 MB/s, while maintaining flexibility suitable for small, crowded spaces.
Implementation Method 1
an adhesive layer between the first and second cores and bonding the first and second cores together
Implementation Method 2
a first polymeric cover layer bonded to an outer surface of the first core, and a second polymeric cover layer bonded to an outer surface of the second core
Data Source
AI summary
An electrical cable including four copper layers, where at least two of the four copper layers are separated by a polymeric base layer, and where at least two of the four copper layers are separated by an adhesive. The electrical cable further includes a polymeric cover layer adhered to an outermost copper layer.