Differential Cable Dielectric Layer for Low Mode Conversion
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Solution Overview
Problem
High-speed differential cables with shielding layers experience unbalanced differential pairs, leading to increased mode conversion, which adds noise and reduces system performance.
Innovation Solution
A cable design featuring a first and second metal conductor with insulators and an intermediate layer material with a lower dielectric constant than the insulators, minimizing mode conversion and enhancing high-frequency characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is added to the cable, then electromagnetic interference protection is improved, but mode conversion increases due to differential pair unbalance
Solution Approach 1:
The patent applies local quality by positioning the intermediate layer specifically between the two conductors of the differential pair, where it directly addresses the unbalance issue. This localized intervention modifies the electromagnetic field distribution precisely where needed, reducing mode conversion without affecting the overall shielding structure.
Solution Approach 2:
The intermediate layer acts as an intermediary element between the two conductors, mediating the electromagnetic interaction. By introducing this third element with specific dielectric properties, the patent balances the differential pair and reduces mode conversion while maintaining the shielding layer's protective function.
2Ease of manufacture
If conventional insulator materials are used, then manufacturing simplicity is maintained, but high-frequency signal integrity deteriorates due to mode conversion
Solution Approach 1:
The patent employs composite materials by combining the conventional insulator material with an intermediate layer material that has different dielectric properties. This composite structure maintains the ease of manufacturing familiar insulator components while adding the functional benefits of the intermediate layer for reducing mode conversion and improving signal integrity.
Solution Approach 2:
The patent applies parameter changes by selecting an intermediate layer material with a dielectric constant lower than that of the conventional insulator material. This parameter change optimizes the electromagnetic characteristics for high-frequency signals, reducing mode conversion while maintaining manufacturing simplicity through the use of standard material selection processes.
3Adaptability or versatility
If the dielectric constant of the intermediate layer is higher than the insulator, then manufacturing flexibility is improved, but mode conversion increases and high-frequency characteristics worsen
Solution Approach 1:
The patent applies parameter changes by inverting the conventional approach: instead of selecting intermediate layer material based on manufacturing convenience alone, it specifically chooses materials with lower dielectric constants than the insulator. This parameter optimization directly addresses mode conversion issues while maintaining reasonable manufacturing flexibility through available material options.
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 cable achieves low mode conversion and improved high-frequency performance by using an intermediate layer material with a lower dielectric constant than the insulators, ensuring better signal integrity and reduced noise.
Implementation Method 1
a dielectric constant of the intermediate layer material is lower than a dielectric constant of the first insulator, and the dielectric constant of the intermediate layer material is also lower than a dielectric constant of the second insulator
Data Source
AI summary
A cable includes a first metal conductor, a first insulator, a second metal conductor and a second insulator. The first insulator is at least partially wrapped on the first metal conductor. The second insulator is at least partially wrapped on the second metal conductor. The first metal conductor is adapted to transmit a first signal. The second metal conductor is adapted to transmit a second signal. The cable also includes an intermediate layer material at least partially wound on the first insulator and the second insulator. A dielectric constant of the intermediate layer material is lower than that of the first insulator, and the dielectric constant of the intermediate layer material is lower than that of the second insulator. With this arrangement, the cable of the present disclosure is capable of realizing low mode conversion and improving the high frequency characteristics.