Shielded Twin-Core Cable With Air Cavity for Lower Signal Loss
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Solution Overview
Problem
Conventional high-speed data transmission cables, such as 112 Gbps cables, have limited high-frequency test bandwidth and significant attenuation due to their structural design, which restricts their performance.
Innovation Solution
The cable design includes a pair of insulation core wires with a central conductor and core wire insulation layer, a shielding layer, and an air accommodating cavity between the insulation layers, reducing the dielectric constant and transmission loss, while also minimizing the insulation outer diameter to enhance coupling and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cable structure with metal shielding layer and insulating tape layers is used, then the cable provides basic shielding and fixation, but the high-frequency test bandwidth is limited to about 40 G and attenuation performance is poor
Solution Approach 1:
The patent introduces air accommodating cavities within the insulation layers, creating a porous structure that reduces the effective dielectric constant. This porous design allows air (with lower dielectric constant) to be distributed throughout the insulation material, thereby reducing signal attenuation and improving high-frequency transmission performance while maintaining the shielding and fixation functions
Solution Approach 2:
The patent creates a composite insulation structure combining solid insulation material with air cavities, forming a composite dielectric material. This composite approach optimizes the dielectric properties by leveraging the low dielectric constant of air while maintaining the mechanical and shielding properties of the solid insulation and metal shielding layers
2Reliability
If the insulation outer diameter is large, then the cable provides sufficient insulation and shielding, but the coupling is reduced and bandwidth is limited
Solution Approach 1:
By incorporating air accommodating cavities into the insulation structure, the effective dielectric constant is reduced without significantly increasing the insulation outer diameter. This allows the cable to maintain adequate insulation performance while reducing the diameter, thereby improving coupling between conductors and increasing bandwidth for higher data transmission speeds
3Reliability
If the cable structure includes multiple insulating tape layers and metal shielding layers, then fixation and shielding are provided, but the cable size becomes large and flexibility is reduced
Solution Approach 1:
The air accommodating cavities are integrated within the existing insulating tape layers and insulation structures, creating a porous configuration that reduces the overall cable diameter without compromising the shielding and fixation provided by the metal shielding layers and insulating tapes. This reduces cable volume while maintaining reliability
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
This configuration enables stable data transmission at higher rates than 60 Gbps with improved attenuation performance and a smaller, more flexible cable size, achieving higher transmission bandwidth and reduced transmission loss.
Implementation Method 1
The air accommodating cavity is formed between the core wire insulation layers of the pair of insulation core wires and the shielding layer, and is adapted to accommodate air... reducing the dielectric constant and transmission loss
Data Source
AI summary
A cable includes a pair of insulation core wires, a shielding layer and an air accommodating cavity. The pair of insulation core wires extend longitudinally parallel to each other. Each of the insulation core wires has a central conductor and a core wire insulation layer wrapped around the central conductor. The shielding layer is wrapped outside the pair of insulation core wires. The air accommodating cavity is formed between the core wire insulation layers of the pair of insulation core wires and the shielding layer, and is adapted to accommodate air.