Data Transmission Cable Differential Impedance Control
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Solution Overview
Problem
Traditional data transmission cables fail to meet the requirements for high-frequency or ultra-high-frequency data transmission due to inadequate control of differential impedance, which affects the integrity of high-speed signals.
Innovation Solution
A data transmission cable design featuring a differential pair with a specific ratio of center distance to outer diameter between adjacent wires, along with a grounding wire, and a layered cover structure to adjust differential impedance and enhance signal transmission, including a lower dielectric coefficient insulative material for reduced latency and a higher dielectric coefficient wave-absorbing layer for external interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional wire structure is used, then manufacturing is simple, but differential impedance cannot be controlled for high-frequency transmission
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ratio of center distance to outer diameter within 1.7-2.35, and adjusting cover layer thickness and material properties to achieve controlled differential impedance for high-frequency signal transmission
Solution Approach 2:
The patent uses composite materials by combining conductors with insulative cover layers having specific dielectric coefficients, creating a composite structure that enables both mechanical strength and electrical performance for differential impedance control
2Speed
If higher transmission frequency is used, then data transmission speed increases, but signal integrity deteriorates due to differential impedance issues
Solution Approach 1:
The patent resolves this contradiction by changing physical parameters including the center distance to outer diameter ratio (1.7-2.35), cover layer thickness, and dielectric coefficient selection, which collectively control differential impedance to maintain signal integrity at high transmission frequencies
Solution Approach 2:
The patent applies equipotentiality principles through the symmetric differential pair structure with controlled impedance, ensuring balanced signal transmission that maintains integrity at high frequencies by minimizing differential mode errors
3Reliability
If center distance between wires is reduced, then coupling is enhanced for better signal transmission, but differential impedance control becomes more difficult
Solution Approach 1:
The patent resolves this contradiction by establishing an optimized parameter range where the center distance to outer diameter ratio is maintained between 1.7-2.35, which simultaneously achieves sufficient coupling and manageable differential impedance control within manufacturing tolerances
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 effectively reduces differential impedance and enhances coupling for long-distance high-frequency signal transmission, ensuring high-speed and effective signal integrity while minimizing crosstalk and external interference.
Implementation Method 1
a lower dielectric coefficient insulative material for reduced latency
Implementation Method 2
a higher dielectric coefficient wave-absorbing layer for external interference suppression
Data Source
AI summary
A data transmission cable includes a first wire and a second wire adjacent to each other, each of the first wire and the second wire has a central conductor and a cover layer enclosing the conductor, and the conductor of the first wire has an outer diameter same as the conductor of the second wire. The ratio of the center distance between the first wire and the second wire to the outer diameter of the conductor is in the range of 1.7 to 2.35.