Signal Transmission Cable With Opposing Metal Shielding Films
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Solution Overview
Problem
Existing signal transmission cables with metal shielding structures face issues of inconsistent impedances due to overlapping and varying thicknesses of shielding components, leading to increased insertion loss and reduced signal transmission quality.
Innovation Solution
A signal transmission cable design featuring oppositely coated metal shielding films with insulation films to secure the shielding, ensuring stable coverage and reducing interference noise, with the metal shielding films made of materials like Al, Cu, and Pb, and a ground wire for effective electromagnetic shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shielding components are coated on the exterior of wires in a spiral longitudinal winding manner, then electromagnetic shielding effect is improved, but gaps are formed between shielding components and thickness varies across the wire surface, causing inconsistent impedances and increased insertion loss
Solution Approach 1:
The patent uses a metal shielding film that is wrapped around the wire and fixed with insulation films, creating a continuous flexible shielding layer. This approach eliminates the gaps and thickness variations inherent in spiral winding methods while maintaining electromagnetic shielding effectiveness, thereby resolving the contradiction between shielding performance and impedance consistency.
2Object-affected harmful factors
If multiple shielding tapes are coated in a multi-layer spiral winding manner, then electromagnetic shielding effect is enhanced, but overlapping structures with varying layers form, causing continuous impedance variation and increased insertion loss
Solution Approach 1:
The patent combines the functions of multiple shielding layers into a single metal shielding film that provides comprehensive electromagnetic shielding. By fixing this film with insulation films at multiple positions, the design achieves stable impedance characteristics without the continuous impedance variations caused by multi-layer overlapping structures, thus resolving the contradiction between shielding effectiveness and impedance stability.
3Object-affected harmful factors
If shielding components are fixed to wires, then electromagnetic shielding is achieved, but the shielding structure increases device complexity and manufacturing difficulty
Solution Approach 1:
The patent employs a flexible metal shielding film that can be easily wrapped around wires and secured with insulation films. This simple yet effective approach provides comprehensive electromagnetic shielding against crosstalk without requiring complex multi-component shielding structures, thereby resolving the contradiction between shielding effectiveness and structural complexity.
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 design significantly reduces interference noise and enhances electromagnetic shielding, improving signal transmission quality and efficiency by stabilizing the metal shielding films and balancing electromagnetic effects.
Implementation Method 1
a first metal shielding film 31 coated on a first part of a surface of the pair of signal wires 23; a second metal shielding film 32 opposite to the first metal shielding film and coated on a second part of the surface of the pair of signal wires 23
Implementation Method 2
a first insulation film 41 for securing the first metal shielding film 31 and the second metal shielding film 32 to the surface of the pair of signal wires 23
Data Source
AI summary
Provided is a signal transmission cable. The signal transmission cable includes: at least one pair of signal wires for transmitting a group of differential electronic signals, a first metal shielding film coated on a part of a surface of the at least one pair of signal wires; a second metal shielding film opposite to the first metal shielding film and coated on a part of a surface of the at least one pair of signal wires; and a first insulation film by which the first metal shielding film and the second metal shielding film are secured to the surface of the pair of signal wires. The first metal shielding film and the second metal shielding film are collectively coated on the entire surface of the at least one pair of signal wires, and the second metal shielding film partially overlaps the first metal shielding film.