Differential Cable Tape Winding for Suck Out Suppression
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Solution Overview
Problem
Conventional differential signal transmission cables experience a sudden drop in transmission characteristics at specific frequencies due to the 'suck out' phenomenon, where electrical insulation by plastic tapes prevents metal foil connections, leading to poor high-speed signal transmission.
Innovation Solution
A differential signal transmission cable design featuring a pair of insulated wires wrapped with spirally wound tapes, where the first tape has a conductive film on one surface and the second tape has a conductive film on another, with specific angles and overlapping widths to ensure electrical connection between the metal foils, preventing insulation and maintaining signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a metal foil tape with double layer structure (metal foil and plastic tape) is wound around insulated wires to form a shielded conductor, then the manufacturing time is shortened, but the transmission characteristic suddenly drops at specific frequencies due to the suck out phenomenon
Solution Approach 1:
The invention extracts and removes the plastic tape from the winding structure, using only the metal foil for winding around the insulated wires. This eliminates the plastic tape that causes electrical insulation between metal foils in overlapped portions, thereby preventing the suck out phenomenon while maintaining the efficient winding manufacturing process
Solution Approach 2:
Instead of using a double-layer structure (metal foil + plastic tape) as in conventional technology, the invention inverts the approach by using only the metal foil layer without the plastic tape overlay, fundamentally changing the structure to eliminate the harmful insulation effect while preserving the shielding function
2Object-affected harmful factors
If plastic tape is used to insulate between metal foils in the wound structure, then electrical insulation is provided, but electrical connection between metal foils is prevented causing suck out
Solution Approach 1:
The invention removes the plastic tape component entirely from the winding structure, extracting the harmful element that prevents electrical connection between metal foils. The metal foil alone is used for winding, allowing direct electrical contact and connection in overlapped portions while still providing the necessary shielding function
Data Source
AI summary
A differential signal transmission cable has a pair of insulated wires, a first tape and a second tape. Each of the first and second tapes is made of a base material having an electrical insulating property and an electrical conductive film formed on at least one surface of the base material. The first tape is spirally wound around the insulated wires such that the electrical conductive film is provided outside. The second tape is spirally wound around the first tape such that the electrical conductive film of the second tape contacts with the electrical conductive film of the first tape. Among angles made by an upper edge of the insulated wires and an edge of the first tape in a side view, a first angle made on one end side of the insulated wires is an acute angle in the first tape.