Transmission Cable Composite Insulation for Mechanical Strength
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Solution Overview
Problem
Existing high speed/frequency transmission cables face issues with mechanical properties such as bending strength, tensile strength, and elongation, which are insufficient due to the use of foam materials and wrapping processes, leading to potential core breakage and yield reduction.
Innovation Solution
A transmission cable structure featuring a composite layer formed by adhering an outer polyimide wrap layer to an inner polytetrafluoroethylene (PTFE) wrap layer with a foaming degree of 65%-77%, using a glue material and a specific wrapping process with a drawing rate of 0.1-0.5 m/min and overlap percentage of 32%-37%, enhancing mechanical properties while maintaining low dielectric constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If foam materials are used to reduce the dielectric constant, then the transmission loss at high speed/frequency is reduced, but the mechanical properties (bending strength, tensile strength, elongation) become insufficient
Solution Approach 1:
The patent uses a composite structure combining PTFE foam material (for low dielectric constant) with polyimide tape (for mechanical strength). The polyimide tape is wrapped around the PTFE foam layer to form a composite insulation layer that maintains both electrical performance and mechanical integrity, preventing core breakage during cable management and manufacturing processes
Solution Approach 2:
The patent applies different materials to different layers of the insulation structure: the inner layer uses PTFE foam for optimal electrical properties (low dielectric constant), while the outer layer uses polyimide tape for enhanced mechanical protection. This localized material assignment allows each layer to perform its specific function optimally without compromising the other
2Strength
If wrapping process is used to improve mechanical properties, then bending strength and tensile strength increase, but the transmission loss at high speed/frequency increases
Solution Approach 1:
The patent creates a composite insulation layer where PTFE foam provides low dielectric constant for reduced transmission loss, while polyimide tape provides the wrapping function for improved mechanical properties. This composite approach allows both requirements to be satisfied simultaneously rather than choosing one over the other
3Loss of energy
If foam materials are used, then the dielectric constant is reduced, but the outer diameter of the transmission cable becomes relatively large
Solution Approach 1:
The patent optimizes the foaming degree of the PTFE material to a specific range (65-77%) to achieve the right balance between dielectric constant reduction and maintaining a compact cable outer diameter. This parameter optimization ensures the cable remains size-selective while achieving low transmission loss
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 solution achieves higher roundness, higher impedance, and lower insertion loss compared to prior art, with improved mechanical strength and selectivity, resulting in a transmission cable with enhanced performance and yield.
Implementation Method 1
The composite layer is formed by an inner surface of an outer wrap layer adhered to an outer surface of an inner wrap layer by a glue material
Implementation Method 2
foam materials are usually used to reduce the dielectric constant
Data Source
AI summary
A transmission cable includes a conductor and a composite layer. The composite layer is formed by having an inner surface of an outer wrap layer adhered to an outer surface of an inner wrap layer with a glue material. The composite layer wraps the conductor and an inner surface of the inner wrap layer is in contact with an outer surface of the conductor. The inner wrap layer is made of polytetrafluoroethylene with a foaming degree of 65% to 77%, and the outer wrap layer is made of polyimide. The composite layer is made by drawing cable at a rate of 0.1-0.5 m/min and taping with an overlap percentage between 32% and 37% during a wrapping process.