Differential Signal Cable Shielding With Oxide Layer Adhesion
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Solution Overview
Problem
The unevenness on the outer peripheral surface of the insulating layer caused by etching in existing differential signal transmission cables degrades transmission characteristics in the high frequency region.
Innovation Solution
A differential signal transmission cable design that includes a metal oxide layer between the shield and the insulating layer, with a copper oxide layer covering the outer peripheral surface of an intermediate layer, and a catalyst particle present in the metal oxide layer, enhancing adhesion and maintaining good transmission characteristics in high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If etching is applied to the outer peripheral surface of the insulating layer to improve adhesion, then adhesion between layers is enhanced, but transmission characteristics in the high frequency region are degraded due to surface unevenness
Solution Approach 1:
A metal oxide layer is introduced as an intermediary between the shield and the insulating layer. This intermediate layer provides a smooth surface for high-frequency signal transmission while maintaining adhesion through its interaction with both the shield and the insulating layer, thereby resolving the contradiction between adhesion enhancement and transmission characteristic preservation.
Solution Approach 2:
The surface roughness parameter of the interface between the shield and insulating layer is changed by inserting the metal oxide layer. This allows the surface to be smooth (low roughness) for high-frequency transmission while the metal oxide layer itself provides the adhesion mechanism, thus changing the physical parameter to resolve the contradiction.
2Stability of the object's composition
If the insulating layer is made harder to prevent deformation, then structural stability is improved, but peeling from signal lines occurs when bent
Solution Approach 1:
The insulating layer is designed with different hardness values in different regions: a first hardness value in the region close to the signal line and a second hardness value in the outer peripheral region. The region near the signal line has lower hardness to maintain adhesion and prevent peeling during bending, while the outer region has higher hardness for structural stability and deformation resistance.
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 secures adhesion between the shield and insulating layer, maintaining good transmission characteristics in the high frequency region while preventing peeling of the insulating layer from the signal lines, even when bent.
Implementation Method 1
a metal oxide layer that exists between the shield and the insulating layer
Implementation Method 2
an electroless plating layer that exists on an outer peripheral surface of the insulating layer
Data Source
AI summary
A differential signal transmission cable includes: an insulating layer that extends along a longitudinal direction of the differential signal transmission cable; a pair of signal lines that extends along the longitudinal direction of the differential signal transmission cable and is buried in the insulating layer; and a shield that exists around an outer peripheral surface of the insulating layer.