Non-Uniform Pitch Cable Shielding for High-Frequency Signal Integrity
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Solution Overview
Problem
Conventional cables with uniform pitch suffer from signal attenuation and reduced signal integrity at high frequencies due to impedance changes and mode conversion, limiting their data transmission rates.
Innovation Solution
A high frequency cable design featuring a cable shield wrapped with insulative strips having a non-uniform pitch, which reduces signal attenuation and enhances signal integrity by allowing higher bit rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform pitch wrapping is used for cable shield, then manufacturing simplicity is maintained, but signal integrity deteriorates at high frequencies due to impedance changes and mode conversion
Solution Approach 1:
The patent applies non-uniform pitch wrapping specifically to the insulative strip layer surrounding the cable shield, while maintaining uniform pitch for the cable shield itself. This localized variation in pitch creates impedance transformations that counteract mode conversion at specific frequency ranges, improving signal integrity without requiring complete redesign of the entire cable structure.
Solution Approach 2:
The patent introduces dynamic pitch variation along the length of the cable, where the pitch of the insulative strip changes progressively rather than remaining static. This dynamic pitch profile is designed to transform impedance at different positions along the cable, thereby suppressing mode conversion and maintaining signal integrity at high frequencies up to 224 Gbps.
2Productivity
If conventional uniform pitch cable design is used, then manufacturing process remains simple, but data transmission rate is limited due to signal attenuation
Solution Approach 1:
The patent changes the pitch parameter of the insulative strip wrapping from uniform to non-uniform, creating a gradient that transforms characteristic impedance along the cable length. This parameter variation reduces signal attenuation by minimizing reflections and mode conversions, thereby enabling higher data transmission rates of 212 Gbps and above.
3Reliability
If non-uniform pitch insulative strip wrapping is implemented, then signal attenuation is reduced and high frequency performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the cable construction into distinct layers with different pitch characteristics: the cable shield maintains uniform pitch for ease of manufacturing, while the insulative strip layer implements non-uniform pitch for performance optimization. This segmentation allows each layer to be manufactured independently using appropriate processes, reducing overall manufacturing complexity while achieving high frequency performance.
Data Source
AI summary
A high frequency cable may include at least one insulative strip wrapped around its cable shield with a non-uniform pitch. Cables may include at least one signal conductor, an insulator around the at least one signal conductor, and a cable shield that surrounds the at least one signal conductor. Pitch of an insulative strip may indicate a distance between edges of successive wrappings about the cable. Cables described herein may be manufactured with a non-uniform pitch, and the non-uniform pitch reduces signal attenuation at certain high frequencies. Because the cables described herein have lower attenuation at those high frequencies, the cables may transmit higher bit rate signals, allowing the cable to transfer more data between high performance electronic components.