Asymmetric Quad-Core Cable Layout to Suppress Suck-Out
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Solution Overview
Problem
The phenomenon of 'suck-out' occurs in multi-core cables, where a sharp decrease in attenuation happens in a certain frequency region, leading to unstable signal transmission.
Innovation Solution
A multi-core cable design featuring a core formed of four insulated wires, where two first wires with a larger outside diameter are twisted together with two second wires of a smaller diameter, arranged such that the first wires are in contact with each other and with adjacent second wires, suppressing the occurrence of suck-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If four insulated wires of the same diameter are twisted together in a quad-structure, then the cable structure is simple and easy to manufacture, but suck-out occurs causing sharp decrease in attenuation at certain frequencies
Solution Approach 1:
The patent applies asymmetry by using two different wire diameters (first wire diameter D1 and second wire diameter D2 where D1 > D2) instead of four identical wires. This asymmetric configuration changes the geometric structure of the core, thereby modifying the electromagnetic field distribution and suppressing the suck-out phenomenon that occurs with symmetric quad-structures.
Solution Approach 2:
The patent applies local quality by assigning different diameters to different wire positions. The first wires have a larger diameter D1 while the second wires have a smaller diameter D2. This local differentiation in wire dimensions creates varying electromagnetic characteristics at different positions within the core, which helps eliminate the resonant conditions that cause suck-out.
2Reliability
If wires are arranged to suppress suck-out, then signal transmission stability improves, but the cable structure becomes more complex
Solution Approach 1:
The asymmetric wire diameter configuration (D1 for first wires, D2 for second wires) provides a relatively simple structural modification compared to more complex solutions like unequal twisting pitches or varying insulation thicknesses. This asymmetry achieves suck-out suppression while maintaining manufacturing feasibility.
Solution Approach 2:
The patent changes the geometric parameter of wire diameter to suppress suck-out. By specifying that D1 > D2 and defining the diagonal contact arrangement, the patent modifies the physical parameters of the cable structure in a controlled manner that improves signal stability without requiring fundamental redesign of the cable architecture.
3Reliability
If different diameter wires are used, then suck-out is suppressed, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies concrete parameter relationships (D1 > D2, with D1 and D2 being the outside diameters of the first and second wires respectively) to suppress suck-out. By defining clear dimensional relationships and contact conditions, the patent provides manufacturable specifications that balance performance improvement with manufacturing capability.
Solution Approach 2:
The patent applies local quality by differentiating wire diameters at specific positions (first wires with diameter D1, second wires with diameter D2). This localized parameter differentiation achieves the desired electromagnetic performance while allowing standard manufacturing tolerances to be applied to each wire type, rather than requiring ultra-precise control of all dimensions.
Data Source
AI summary
A multi-core cable includes a core formed of four insulated wires twisted together, a shield layer, and a jacket. The four insulated wires are constituted by two first wires and two second wires. An outside diameter of each of the first wires is larger than an outside diameter of each of the second wires. In a cross-section of the core perpendicular to a longitudinal direction thereof, a center of each of the first wires is positioned on a first diagonal line of a quadrangular shape formed by a line connecting centers of the four insulated wires, and a center of each of the second wires is positioned on a second diagonal line of the quadrangular shape. The first wires are in contact with each other, and in contact with the second wires adjacent to the first wires.