High-Frequency Transmission Cable Segmented Shielding
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Solution Overview
Problem
Conventional flexible flat cables (FFCs) suffer from poor high-speed transmission characteristics and increased crosstalk issues when extended, particularly in server applications, making them unsuitable for high-frequency and flexible conditions, and existing solutions are not adaptable for automated mass production.
Innovation Solution
A long straight high-frequency transmission cable design featuring multiple transmission wires and ground wires with strategically placed conductive plugs and shielding layers, where the ground wires are electrically connected to the shielding layers via conductive plugs, providing structural strength and flexibility while minimizing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the cable length is increased to extend signal transmission, then the transmission distance is improved, but crosstalk between transmission signals increases
Solution Approach 1:
The cable is divided into multiple cable sections, each with its own shielding layer and ground wires. The shielding layers are electrically connected through ground wires at intervals, creating segmented shielding zones that contain electromagnetic interference locally and prevent it from propagating along the entire cable length, thus reducing crosstalk between distant signal pairs.
Solution Approach 2:
Ground wires serve as intermediaries that electrically connect adjacent shielding layers at regular intervals along the cable. These ground wires provide a low-impedance path for electromagnetic interference to dissipate, acting as a mediator that prevents interference from coupling between signal pairs in different cable sections.
2Length of moving object
If the cable length is increased to extend signal transmission, then the transmission distance is improved, but structural strength and flexibility deteriorate
Solution Approach 1:
The cable structure is segmented into multiple sections with discrete ground wires and shielding layers. This segmentation allows the cable to flex at the ground wire connection points while maintaining overall structural integrity, improving both flexibility and strength for long cable applications.
3Ease of manufacture
If conventional FFC structure is used for high-speed transmission, then ease of manufacture is improved, but transmission characteristics worsen
Solution Approach 1:
The cable employs segmented shielding with ground wires at regular intervals, which can be manufactured using standardized processes while significantly improving transmission characteristics by reducing crosstalk and electromagnetic interference, thus achieving both ease of manufacture and high reliability.
Solution Approach 2:
The cable design changes key parameters including ground wire spacing, shielding layer configuration, and conductor arrangement to optimize transmission characteristics for high-speed applications while maintaining manufacturability through standardized manufacturing processes.
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 design effectively suppresses crosstalk and maintains signal integrity over increased lengths, offering improved structural strength and flexibility, and is suitable for high-frequency applications with reduced signal attenuation and improved impedance matching.
Implementation Method 1
a first shielding layer and a second shielding layer which are respectively laminated on the first insulating laminate and the second insulating laminate; wherein the transmission wires each have a width greater than 0 and less than or equal to 0.8 mm, and the at least one ground wire has a width greater than 0 and less than or equal to 0.8 mm. The at least one ground wire is electrically connected to the first shielding layer by the first conductive plugs
Data Source
AI summary
A long straight high-frequency transmission cable includes a plurality of transmission wires, at least one ground wire, first and second insulating laminates, and first and second shielding layers. The transmission wires and the ground wire are parallel to each other. The first insulating laminate and the second insulating laminate are laminated with each other to cover the transmission wires and the ground wire. The first shielding layer and the second shielding layer are respectively laminated on the first insulating laminate and the second insulating laminate. The first insulating laminate has a plurality of first conductive plugs separately arranged along a length direction of the ground wire, and each two adjacent ones of the first conductive plugs have a spacing therebetween that is at least greater than 50 mm.