Composite Metal Shielding Cable for EMI Control and Grounding
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Solution Overview
Problem
Signal cables are susceptible to interference from external electromagnetic signals during transmission, and there is a need for improved shielding to prevent signal leakage and enhance stability.
Innovation Solution
A cable design featuring a dual-layer shielding structure with different metal materials, including a copper foil outer layer and an aluminum foil inner layer, integrated through high temperature and high pressure, and a unique joint configuration with overlapping and raised portions to facilitate grounding without a ground wire, enhancing electrical performance and signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional single-layer shielding structure is used, then the cable structure is simple, but the electromagnetic shielding effect is insufficient
Solution Approach 1:
The patent employs a composite shielding structure consisting of an inner aluminum foil layer and an outer copper foil layer. The aluminum layer provides baseline shielding while the copper layer enhances electromagnetic interference protection. This composite material approach resolves the contradiction by achieving superior shielding effectiveness without requiring overly complex structural designs, as the two metal layers work synergistically to block electromagnetic fields across a broader frequency range.
Solution Approach 2:
The shielding structure implements a nested configuration where the inner aluminum foil layer is positioned within the outer copper foil layer, both surrounding the core wire. This nested arrangement maximizes the shielding effect within a compact space, allowing the cable to achieve high electromagnetic protection without increasing overall cable diameter or requiring additional external grounding components.
2Reliability
If a ground wire is added to improve grounding, then the grounding effect is enhanced, but the cable volume increases
Solution Approach 1:
The outer copper foil layer serves multiple functions simultaneously: it provides enhanced electromagnetic shielding, acts as the grounding element itself, and eliminates the need for a separate ground wire. The copper layer is designed with specific electrical conductivity and is directly connected to the grounding system at the cable ends, allowing it to fulfill both shielding and grounding roles, thereby maintaining reliability while minimizing cable volume.
Solution Approach 2:
The patent merges the grounding function with the outer shielding layer by making the copper foil layer itself the grounding element. Instead of adding a separate ground wire, the copper layer is configured to provide both electromagnetic protection and electrical ground connection, consolidating multiple functions into a single integrated component that reduces overall cable complexity and volume.
3Object-affected harmful factors
If the shielding layer is made thicker to improve shielding effect, then the electromagnetic protection is enhanced, but the cable diameter increases
Solution Approach 1:
Rather than increasing the thickness of a single shielding layer, the patent uses a composite structure with two thinner metal foil layers (aluminum and copper). Each layer contributes to the overall shielding effect, and their combined thickness is significantly less than what would be required for a single-layer structure to achieve equivalent protection. This approach enhances electromagnetic shielding while maintaining a compact cable diameter.
Solution Approach 2:
The patent changes the material parameters by selecting aluminum and copper foils with specific thicknesses and electrical conductivities. By optimizing the thickness and material properties of each layer, the design achieves maximum shielding effectiveness per unit thickness, allowing the cable to maintain a small diameter while providing robust electromagnetic protection through carefully selected material parameters.
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 dual-layer shielding structure effectively reduces electromagnetic interference, improves signal transmission reliability, and reduces cable volume by eliminating the need for a ground wire while maintaining robust electrical connections.
Implementation Method 1
the first metal layer and the second metal layer being integrally composited
Data Source
AI summary
A cable includes a core wire, a shielding layer located on a periphery of the core wire, and an insulating skin at least partially located on a periphery of the shielding layer. The shielding layer includes at least a first metal layer and a second metal layer. The first metal layer and the second metal layer have different metal materials. The first metal layer and the second metal layer are integrally composited. With this arrangement, the shielding effect of the cable is improved.