Data Transmission Cable Impedance Control via Conductor Spacing
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Solution Overview
Problem
Traditional data transmission cables fail to meet the requirements for high-frequency signal transmission due to inadequate control of differential characteristic impedance, which is crucial for maintaining signal integrity at higher speeds.
Innovation Solution
A data transmission cable design featuring a differential pair with a specific conductor size and center distance, accompanied by a grounding wire, and layered insulation with varying dielectric coefficients to manage impedance and suppress electromagnetic interference, ensuring effective high-frequency signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional wire structures are used, then manufacturing is simple and cost is low, but differential characteristic impedance cannot be controlled within 80 to 100 Ohm range
Solution Approach 1:
The patent applies parameter changes by precisely controlling conductor outer diameter (28-31 AWG) and center distance between wires (0.38-0.75 mm depending on AWG) to achieve differential impedance within 80-100 Ohm range. This involves changing geometric parameters of the wire structure to resolve the contradiction between impedance control precision and structural complexity.
Solution Approach 2:
The patent uses composite material structure with conductor core and insulative cover layer, where the cover layer material properties are selected to achieve target differential impedance. This composite structure enables precise impedance control while maintaining manufacturability.
2Speed
If higher transmission frequency is used, then data transmission speed increases, but signal integrity deteriorates due to uncontrolled differential impedance
Solution Approach 1:
The patent controls differential impedance parameters (conductor diameter 28-31 AWG, center distance 0.38-0.75 mm) to maintain signal integrity at high transmission frequencies. By optimizing these geometric parameters, the cable supports higher data transmission speeds while preventing signal degradation.
3Power
If conductor size is increased, then current carrying capacity improves, but center distance must be reduced which complicates impedance control
Solution Approach 1:
The patent specifies conductor outer diameter in 28-31 AWG range with corresponding center distance adjustments (0.51-0.75 mm for 28 AWG, 0.38-0.75 mm for 29 AWG, 0.38-0.62 mm for 30-31 AWG). This coordinated parameter change allows larger conductors for better current capacity while maintaining precise impedance control through adjusted spacing.
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. The conductor has an outer diameter in the range of 28 to 31 AWG, and when the outer diameter of the conductor is 28 AWG, the center distance between the first and second wires is defined between 0.51 mm to 0.75 mm; when the outer diameter of the conductor is 29 AWG, the center distance between the first and second wires is set between 0.38 mm to 0.75 mm; when the outer diameter of the conductor is 30 to 31 AWG, the center distance between the first and second wires is set between 0.38 mm to 0.62 mm.