Shielded Cable Layout for Stable Low-Cost EMI Protection
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Solution Overview
Problem
Traditional cables with a single ground wire and shielding layer are unstable, while those with two ground wires are costly and inefficient in reducing electromagnetic interference.
Innovation Solution
A cable design featuring a pair of core wires, a shielding layer, an insulating outer layer, a ground wire, and a filler wire arranged symmetrically between the core wires and the shielding layer, which enhances stability and reduces costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one ground wire and a shielding layer are used, then the cable structure is simpler and cost is lower, but the cable structure becomes unstable
Solution Approach 1:
The patent applies asymmetry by using a single ground wire positioned asymmetrically relative to the core wires, combined with a symmetrically arranged filler wire. This asymmetric ground wire configuration simplifies the structure compared to traditional two-ground-wire designs while the filler wire provides structural balance, achieving both cost reduction and structural stability.
2Stability of the object's composition
If two ground wires are used, then the cable structure becomes stable, but the cost increases
Solution Approach 1:
The patent replaces one expensive ground wire with a cheaper filler wire that provides structural support. The filler wire, while not having the same electrical grounding function, maintains structural stability at lower cost, effectively substituting a costly component with a more economical alternative that fulfills a different but complementary function.
Solution Approach 2:
The filler wire serves multiple functions: it provides structural support to maintain cable stability, occupies space to prevent core wire deformation, and works in conjunction with the single ground wire to achieve electromagnetic shielding. This multi-functionality allows the cable to achieve stability without requiring two dedicated ground wires.
3Ease of manufacture
If traditional shielding layer design is used, then manufacturing is simpler, but electromagnetic interference protection is insufficient
Solution Approach 1:
The patent applies local quality by positioning the ground wire in specific locations relative to the core wires and shielding layer. This strategic positioning creates localized electromagnetic shielding zones that effectively block interference from specific directions, enhancing overall EMI protection while maintaining simple manufacturing processes.
Data Source
AI summary
A cable includes: a pair of core wires; a shielding layer covering the pair of core wires; an insulating outer layer covering the shielding layer; a ground wire between the pair of core wires and the shielding layer; and a filler wire between the pair of core wires and the shielding layer, and the filler wire is arranged symmetrically with the ground wire.