Automotive Communication Cable Sheath Dielectric Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Communication cables used in automobiles face challenges in achieving high-speed communication while maintaining required transmission characteristics, including mode conversion characteristics, due to limitations in dielectric properties of existing materials.
Innovation Solution
A communication cable design featuring a twisted wire pair with a sheath made of insulating material having a dielectric loss tangent of 0.0001 or more, which effectively attenuates coupling with ground potential and suppresses signal attenuation, while also allowing for a reduction in cable diameter and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sheath with high dielectric loss tangent is used to attenuate coupling with ground potential, then mode conversion characteristics are improved, but signal attenuation increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the dielectric loss tangent of the sheath material to be within 0.001 to 0.1. This optimized parameter range enables the sheath to provide sufficient coupling attenuation for improved mode conversion characteristics while preventing excessive signal attenuation, thus resolving the technical contradiction through quantitative parameter optimization.
Solution Approach 2:
The patent employs composite material design by selecting sheath materials with specific dielectric properties that balance coupling attenuation and signal transmission. The use of materials like polyethylene or polypropylene with controlled dielectric loss tangent values creates a composite structure that simultaneously achieves both mode conversion suppression and signal integrity maintenance.
2Object-generated harmful factors
If the dielectric loss tangent of the sheath is increased to reduce coupling with ground potential, then transmission mode conversion is suppressed, but communication reliability deteriorates due to signal attenuation
Solution Approach 1:
The patent resolves this contradiction by optimizing the dielectric loss tangent parameter within a specific range (0.001 to 0.1). This controlled parameter change ensures the sheath generates sufficient dielectric loss to attenuate coupling with ground potential while maintaining signal transmission quality, thus suppressing harmful coupling effects without compromising communication reliability.
Solution Approach 2:
The sheath acts as an intermediary element with specifically tuned dielectric properties. By positioning the sheath between the twisted wire pair and the external environment with controlled dielectric loss tangent, it mediates the interaction between the signal and ground potential, providing sufficient coupling attenuation while preserving signal integrity for reliable communication.
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 cable achieves excellent mode conversion characteristics with a transmission mode conversion of 46 dB or more, reducing signal attenuation and maintaining high-speed communication performance within a compact and lightweight form.
Implementation Method 1
the sheath has a dielectric loss tangent of 0.0001 or more... coupling between the twisted wire pair and a ground potential of the surrounding of the communication cable can be effectively attenuated by dielectric loss at the sheath
Data Source
AI summary
A communication cable that includes a twisted wire pair that includes a pair of insulated wires that are twisted together and that each include a conductor and an insulating covering that covers an outer periphery of the conductor; and a sheath that is made of an insulating material and continuously covers an entire outer periphery of the twisted wire pair about a center along a longitudinal axis of the twisted wire pair, wherein the sheath has a dielectric loss tangent of 0.0001 or more in a frequency range of 1 to 50 MHz.