Embedded Ground Plane Flat Cable for EMI and Crosstalk Control
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Solution Overview
Problem
Existing flat flexible cables (FFC) face issues with increased crosstalk and electromagnetic interference (EMI) as trace counts increase and spacing decreases, affecting signal transmission integrity.
Innovation Solution
Incorporation of a multi-layered structure with conductive layers separated by non-conductive layers and an embedded conductive ground plane to reduce crosstalk and EMI, using materials like polyimide to absorb signals and the ground plane to act as an EMI shield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trace counts are increased and spacing is decreased to improve data transmission capacity, then productivity and information capacity are improved, but crosstalk and electromagnetic interference increase, worsening signal transmission integrity
Solution Approach 1:
The cable is divided into multiple layers with conductive layers separated by non-conductive layers. This segmentation isolates adjacent conductive traces, reducing electromagnetic coupling and crosstalk between signals, thereby maintaining signal integrity even with increased trace density
Solution Approach 2:
Non-conductive layers are introduced as intermediary materials between conductive layers. These intermediary layers act as electromagnetic barriers that absorb and shield signals, preventing interference between adjacent conductive traces while allowing the cable to maintain high trace counts
2Quantity of substance
If narrower traces are used to increase trace density, then data transmission capacity is improved, but electromagnetic interference and crosstalk increase, worsening signal integrity
Solution Approach 1:
The solution moves from a two-dimensional planar arrangement of traces to a three-dimensional multi-layered structure. By stacking conductive layers separated by non-conductive layers, the cable achieves high trace density through vertical dimensionality while the non-conductive layers provide electromagnetic shielding in the vertical direction, reducing interference between closely spaced narrow traces
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
The design allows for narrower traces and higher trace density while maintaining acceptable EMI and crosstalk levels, enhancing electrical performance and signal integrity.
Implementation Method 1
using materials like polyimide to absorb signals
Implementation Method 2
the ground plane to act as an EMI shield
Data Source
AI summary
A flat flexible cable including a first conductive layer with a plurality of traces, a second conductive layer with a second plurality of traces, a first non-conductive layer disposed between the first conductive layer and the second conductive layer, and a second non-conductive layer disposed between the second conductive layer and a conductive ground layer, where the first conductive layer, the second conductive layer, and the conductive ground layer are electrically connected.