Coaxial Cable Shielding Layer Indentations Bending Resistance
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Solution Overview
Problem
Conventional coaxial cables experience rapid attenuation and degradation in shielding effect due to crack formation and peeling of the plating in the shielding layer when repeatedly bent, leading to noise issues in high-frequency bands.
Innovation Solution
A coaxial cable design featuring a shielding layer composed of helically wrapped metal wires embedded in an electrically insulating member with indentations, where the wires are mated to the member's surface and in surface contact with each other, enhancing the cable's resistance to bending-induced gaps and maintaining constant impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shielding layer is made of plating on the electrically insulating member, then the sucking out phenomenon is suppressed, but crack formation and peeling occur when the cable is repeatedly bent
Solution Approach 1:
The shielding layer is divided into multiple independent metal wires (served shields) instead of using a continuous plating layer. Each wire can move independently during bending, preventing crack formation and peeling while maintaining shielding effectiveness through the collective arrangement of multiple wires.
Solution Approach 2:
The patent combines metal wires with the electrically insulating member to form a composite shielding structure. The metal wires provide electrical shielding while the insulating member provides mechanical support and flexibility, creating a composite material system that resolves the contradiction between shielding effect and bending resistance.
2Strength
If metal wires are helically wrapped around the electrically insulating member, then bending resistance is improved, but gaps may form between wires during repeated bending
Solution Approach 1:
The metal wires are embedded within grooves or indentations of the electrically insulating member, creating a nested structure where the wires are held securely in place. This prevents gap formation during bending while allowing the wires to move flexibly within their designated positions.
Solution Approach 2:
The electrically insulating member acts as a flexible matrix that accommodates the metal wires. The insulating member's flexibility allows the entire shielding layer to bend without creating gaps between wires, while the wires remain in constant contact to maintain shielding effectiveness.
3Reliability
If the shielding layer uses plating to suppress sucking out, then high-frequency signal transmission is improved, but the shielding effect degrades after repeated bending
Solution Approach 1:
The continuous plating is segmented into multiple discrete metal wires. This segmentation prevents the formation and propagation of cracks that would occur in continuous plating during repeated bending, thereby extending the service life while maintaining the high-frequency signal transmission capability through the distributed wire arrangement.
Data Source
AI summary
A coaxial cable includes a conductor, an electrically insulating member provided over a periphery of the conductor, a shielding layer composed of served shields formed by helically wrapping a plurality of metal wires around the electrically insulating member, and a sheath provided around the shielding layer. The electrically insulating member includes indentations on portions of its surface to be brought into contact with and mated to the metal wires respectively. The shielding layer includes portions in respective circumferential directions of the plurality of metal wires being brought into contact with the electrically insulating member are mated to the indentations, respectively, on the electrically insulating member, and adjacent ones of the metal wires in a circumferential direction of the shielding layer are in surface contact with each other.