Automotive Communication Cable Diameter Reduction
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Solution Overview
Problem
There is a demand for reducing the diameter of communication cables used in automobiles while maintaining the required characteristic impedance for high-speed communication, such as Ethernet communication, which is typically 100±10Ω, without compromising transmission characteristics.
Innovation Solution
A communication cable design featuring a twisted pair with insulated wires having a conductor with a tensile strength of 400 MPa or higher and a thin insulation coating, surrounded by a sheath with a dielectric tangent of 0.0001 or higher, and a gap between the sheath and the wires, which ensures a characteristic impedance of 100±10Ω even with reduced diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of the insulator is reduced to decrease cable diameter, then the cable diameter is reduced, but the characteristic impedance falls below the required range
Solution Approach 1:
The patent changes the material parameters of the conductor by specifying a tensile strength of 400 MPa or higher, which enables the use of thinner insulation coatings (0.30 mm or smaller) while maintaining the required characteristic impedance of 100±10Ω. This parameter change in conductor strength allows the insulation thickness to be reduced without compromising electrical performance.
Solution Approach 2:
The patent employs a composite structure consisting of a high-strength conductor material combined with a thin insulation coating and an outer sheath. This composite design allows the thin insulation (0.30 mm or smaller) to provide sufficient electrical isolation while the high-strength conductor maintains mechanical integrity and proper impedance characteristics.
2Volume of moving object
If the insulation coating is made thinner to reduce cable size, then the cable diameter is reduced, but transmission characteristics are compromised
Solution Approach 1:
The patent specifies that the conductor must have a tensile strength of 400 MPa or higher, which fundamentally changes the mechanical parameter of the conductor. This enables the insulation coating to be made thinner (0.30 mm or smaller) while the high-strength conductor compensates for the reduced insulation thickness, maintaining proper transmission characteristics and signal integrity.
Solution Approach 2:
The outer sheath acts as an intermediary protective layer that covers the twisted pair of insulated wires. This sheath provides additional mechanical protection and environmental shielding, allowing the individual insulation coatings to be thinner while the overall cable structure maintains reliability and transmission characteristics.
3Volume of moving object
If the cable diameter is reduced for space constraints, then installation space is reduced, but impact resistance decreases
Solution Approach 1:
The patent fundamentally changes the mechanical strength parameter of the conductor by requiring a tensile strength of 400 MPa or higher. This high-strength conductor enables the cable to be made with thinner insulation (reducing overall diameter) while maintaining sufficient impact resistance and mechanical durability for automotive applications.
Solution Approach 2:
The patent creates a composite cable structure with a high-strength conductor core, thin insulation coating, and outer sheath protection. This composite design achieves a optimal balance between reduced diameter and maintained impact resistance, as each layer contributes different functional properties to the overall cable performance.
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 effectively reduces the cable diameter while maintaining the required characteristic impedance, achieving high mode conversion and suppressing noise and signal attenuation, and provides high impact resistance and stability in transmission characteristics.
Implementation Method 1
the sheath is made of an insulating material having a dielectric tangent of 0.0001 or higher
Data Source
AI summary
A communication cable that has a reduced diameter while ensuring a required magnitude of characteristic impedance. The communication cable contains a twisted pair that contains a pair of insulated wires, twisted with each other and a sheath covering the twisted pair. Each of the insulated wires, contains a conductor that has a tensile strength of 400 MPa or higher and an insulation coating that covers the conductor. The sheath is made of an insulating material having a dielectric tangent of 0.0001 or higher. The communication cable 1 has a characteristic impedance of 100±10 Ω.