Twisted Communication Cable Insulator Foam Ratio
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Solution Overview
Problem
Existing communication cables face challenges in balancing flexibility and signal transmission characteristics, as shielded twisted pair wires suffer from uneven conductor-to-foil distance leading to attenuation, while shielded parallel pair wires lack flexibility and are prone to bending issues.
Innovation Solution
A communication cable design featuring two insulated electric wires twisted together with a drain wire and covered by a metal foil, where the insulator has a foaming ratio between 41% and 45% to enhance flexibility and prevent suck-out frequency overlap with signal frequencies, while maintaining stable impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two insulated electric wires are twisted together to improve flexibility, then flexibility is improved, but the distance between conductor and metal foil becomes uneven causing suck-out
Solution Approach 1:
The insulator uses a foamed material with a specific foam ratio (30-60%) to change the physical parameters of the insulator structure. This foam structure compensates for the uneven distance caused by twisting, maintaining stable impedance and preventing suck-out while preserving the flexibility benefits of the twisted configuration
Solution Approach 2:
The insulator is constructed as a composite material combining foam material with specific density characteristics. This composite structure provides both the mechanical flexibility needed for twisted wiring and the electrical stability required to maintain consistent conductor-to-foil distance, resolving the contradiction between flexibility and transmission characteristics
2Reliability
If two insulated electric wires are arranged in parallel to prevent suck-out, then transmission characteristics are maintained, but flexibility deteriorates
Solution Approach 1:
By changing the insulator material to a foamed structure with optimized foam ratio, the patent enables the twisted pair configuration to maintain stable electrical characteristics. The foam structure absorbs the dimensional variations caused by twisting, allowing the cable to achieve both flexibility and reliable transmission characteristics simultaneously
3Reliability
If foam ratio is increased to increase suck-out frequency, then suck-out frequency increases, but insulator may be crushed and impedance changes greatly
Solution Approach 1:
The patent optimizes the foam ratio parameter within the specific range of 30-60%, balancing two competing requirements: higher foam ratio increases suck-out frequency to avoid signal interference, while lower foam ratio maintains insulator strength. This precise parameter control resolves the contradiction between electrical performance and mechanical strength
Data Source
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AI summary
The communication cable includes a two-core communication line including two insulated electric wires each having a conductor and an insulator covering the conductor, a drain wire and a metal foil. The two-core communication line and the drain wire are collectively covered with the metal foil. The two insulated electric wires are twisted together. The insulator has a foaming ratio being equal to or smaller than 45%. The insulator may have the foaming ratio being equal to or greater than 28%. A wire harness may include the communication cable.