High Capacity Communication Cable Impedance Control
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Solution Overview
Problem
Current communication cables face limitations in high-speed data transmission due to increased noise and impedance mismatch issues, particularly with higher modulation frequencies, which affect signal quality and capacity.
Innovation Solution
The development of a communication cable with specific conductor and wire diameter ratios, insulation materials, and varying pitches to achieve an impedance range of 90 to 110 ohms, minimizing return loss and enhancing productivity for high-speed data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If higher modulation frequency is used to increase information transmitting capacity, then data transmission rate is improved, but noise due to cross talk and impedance change is increased
Solution Approach 1:
The patent applies parameter changes by optimizing the conductor diameter (0.48mm to 0.65mm) and wire diameter (0.8mm to 1.15mm) within specific ranges, and by controlling the ratio D/d between 1.625 to 1.835. These parameter adjustments enable the cable to achieve impedance between 90-110 ohms while maintaining structural integrity, thereby reducing cross talk and impedance mismatch at higher frequencies up to 500-650 MHz
Solution Approach 2:
The patent implements local quality by applying insulation coating specifically to the conductor surface, creating a differentiated structure where the conductor core and outer wire have distinct properties. The insulation layer provides localized electrical isolation between conductors, reducing capacitive coupling and cross talk in critical areas while maintaining overall cable flexibility and signal transmission capability
2Quantity of substance
If higher frequency is used to improve transmission capacity, then information transmitting capacity is improved, but insertion loss and impedance mismatching are increased
Solution Approach 1:
The patent utilizes parameter changes by precisely controlling the conductor diameter (0.48mm to 0.65mm) and wire diameter (0.8mm to 1.15mm) to achieve optimal impedance matching between 90-110 ohms. This parameter optimization reduces reflection and standing waves at high frequencies, thereby minimizing insertion loss and enabling effective signal transmission at frequencies up to 500-650 MHz with sustained data rates of 10 Gbps
3Speed
If higher frequency is used to increase transmission capacity, then data rate is improved, but cross talk between wires is increased
Solution Approach 1:
The patent applies local quality by coating the conductor with insulation material, creating electrical isolation between adjacent wire pairs. This localized insulation layer reduces capacitive coupling and electromagnetic interference between neighboring conductors, effectively suppressing near-end and far-end cross talk (NEXT and FEXT) while maintaining signal integrity at high data rates up to 10 Gbps
Solution Approach 2:
The patent implements segmentation by dividing the cable into four independent twisted pairs, each with its own insulation coating. This segmentation isolates signal paths and reduces mutual interference between pairs, allowing higher frequency signals to be transmitted with minimized cross talk through the twisted pair configuration and individual insulation layers
4Reliability
If impedance is matched to international standard of 100 ohm, then signal quality is improved, but manufacturing precision requirements are increased
Solution Approach 1:
The patent applies parameter changes by defining broader impedance ranges of 90-110 ohms instead of strictly 100 ohms, while simultaneously specifying precise conductor diameter (0.48mm to 0.65mm) and wire diameter (0.8mm to 1.15mm) ranges. This approach maintains signal quality by ensuring impedance remains within acceptable tolerances, reducing reflection and signal degradation, while providing manufacturing flexibility to achieve consistent performance without requiring ultra-precise dimensional control
Data Source
AI summary
In communication cable of high capacity, conductor of diameter d is coated by insulation material to form wire of diameter D, plural number of the wire are twisted by pitch p to form pairs, plural number of the pairs are twisted by collective pitch P. The communication cable of high capacity has sheath wrapping the pairs, and impedance (Z) of the wire is from 90 to 110, and, diameter (d) of the conductor is from 0.48 mm to 0.65 mm, and diameter (D) of wire is from 0.8 mm to 1.15 mm, and the pitch (p) is from 7 mm to 30 mm, and the collective pitch (P) is from 40 mm to 150 mm, and relative ratio of diameter of wires to diameter of conductor D/d is from 1.625 to 1.835.