Helically-Wrapped Shielding Tape for Communication Cable
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Solution Overview
Problem
Conventional twin-axial cables with helically-wrapped shielding tapes experience a 'suck-out' effect due to electrical isolation between overlapping wraps, limiting data transmission speed to around 14 Gbps, and alternative configurations that reduce this effect compromise flexibility.
Innovation Solution
A communication cable design featuring a composite tape with an insulative and conductive layer, where the tape's lateral sections are folded over each other to form a shielding tape that is wrapped helically, ensuring electrical coupling between wraps through a folded edge, thereby reducing the suck-out effect while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shielding tape is helically wrapped around the insulated conductors, then the cable flexibility is improved, but the data transmission speed is limited due to the suck-out effect
Solution Approach 1:
The plastic backing is removed from the shielding tape, extracting the source of electrical isolation between wraps. This eliminates the suck-out effect that limited data transmission speed to 14 Gbps, while preserving the helical wrap configuration that provides cable flexibility.
Solution Approach 2:
The shielding tape uses a composite structure of conductive foil layers without plastic backing, allowing electrical coupling between overlapping wraps through direct contact. This composite approach enables both high data transmission speeds (15 Gbps or more) and maintained flexibility from the helical configuration.
2Speed
If the shielding tape is folded over the insulated conductors, then the suck-out effect is reduced, but the cable flexibility is compromised
Solution Approach 1:
Instead of folding the shielding tape to reduce suck-out effect (which compromises flexibility), the invention inverts the approach by using a helical wrap configuration with conductive foil that directly contacts and electrically couples with previous wraps, achieving both high speed and flexibility simultaneously.
3Device complexity
If the conductive foil is separated by plastic backing in overlapping regions, then the shielding structure is simplified, but the data transmission speed is limited
Solution Approach 1:
The plastic backing is completely removed from the shielding tape structure, extracting the element that caused electrical isolation. This simplification eliminates the suck-out effect and enables data transmission at 15 Gbps or more, proving that simpler structure can achieve better performance.
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 solution enables data transmission at higher speeds, such as 15 Gbps or more, with reduced insertion loss, particularly above 16 GHz, and maintains the flexibility of cables with helically-wrapped shielding, outperforming conventional cables in both speed and performance.
Implementation Method 1
The shielding tape includes a conductive foil that functions to shield the insulated conductors from electromagnetic interference (EMI)
Implementation Method 2
The folded edge of the prior wrap extends between and electrically couples the inner side of the prior wrap to the inner side of the subsequent wrap
Data Source
AI summary
Communication cable including insulated conductors and a composite tape having an insulative layer and a conductive layer. The composite tape includes first and second lateral sections that are folded over each other to form a shielding tape. The shielding tape includes opposite inner and outer sides that are formed from the first and second lateral sections, respectively, and a folded edge that joins the inner and outer sides. The conductive layer defines the inner side, the outer side, and the folded edge. The shielding tape is wrapped helically about the insulated conductors a plurality of times along a length of the communication cable to form a plurality of wraps. The inner side of a subsequent wrap of the shielding tape overlaps a portion of the outer side of a prior wrap of the shielding tape.