Coaxial Cable Shield Layer Hot Dip Plating for Crack 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 shield layer, especially when repeatedly bent, leading to noise interference and signal loss in high-frequency bands.
Innovation Solution
A coaxial cable design featuring a shield layer with a lateral winding shielding portion of metal wires and a batch plating portion using hot dip plating, where the outer peripheral portion is coated with intermetallic compounds, enhancing flexibility and preventing crack formation, while the inner peripheral portion maintains high electrical conductivity to suppress signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shield layer is made of plating to suppress suck-out, then rapid attenuation in predetermined frequency band is suppressed, but crack formation and peeling occur when repeatedly bent leading to degradation in shielding effect
Solution Approach 1:
The shield layer is constructed as a composite structure combining a lateral winding shielding portion made of metal wires with a batch plating portion applied via hot dip plating. This composite configuration allows the metal wires to provide structural integrity and flexibility while the plating layer suppresses suck-out and maintains electrical conductivity, resolving the contradiction between shielding effectiveness and resistance to mechanical degradation.
Solution Approach 2:
The shield layer exhibits different properties in different regions: the lateral winding shielding portion provides flexibility and mechanical strength, while the batch plating portion provides electrical conductivity and suck-out suppression. This local differentiation of material properties allows the shield layer to simultaneously achieve both shielding effectiveness and resistance to crack formation and peeling.
2Reliability
If the shield layer is made of plating to suppress suck-out, then rapid attenuation in predetermined frequency band is suppressed, but the shield layer becomes rigid and prone to crack formation during repeated bending
Solution Approach 1:
The composite structure of metal wires and plating layer allows the shield to combine the flexibility of the wire mesh with the surface properties of the plating. The metal wires accommodate bending movements while the plating layer maintains its integrity through the intermetallic compound layer, enabling the shield to adapt to repeated bending without cracking.
Solution Approach 2:
The hot dip plating process creates an intermetallic compound layer between the metal wires and the plating material, which changes the mechanical parameters of the interface. This intermetallic layer increases ductility and flexibility compared to simple adhesion, allowing the plating to deform with the underlying metal wires during bending without forming cracks.
3Reliability
If a batch plating is applied to cover the periphery of the lateral winding shielding portion, then electrical conductivity is improved, but the complexity of the manufacturing process increases
Solution Approach 1:
The hot dip plating process is a self-service coating method where the lateral winding shielding portion is simply immersed in the molten plating material, allowing the plating to automatically coat all exposed surfaces. This eliminates the need for complex masking, positioning, or controlled deposition systems, maintaining ease of manufacture while achieving complete and uniform electrical conductivity enhancement.
Solution Approach 2:
The hot dip plating process utilizes phase change of the plating material from solid to liquid and back to solid, enabling complete coverage of the lateral winding shielding portion in a single immersion step. This parameter-based approach (temperature control during phase change) simplifies the manufacturing process compared to layer-by-layer deposition methods while ensuring uniform electrical conductivity.
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 effectively prevents rapid attenuation and maintains shielding effectiveness up to 26 GHz, improving bendability and termination workability by ensuring continuous electrical conductivity and stable impedance.
Implementation Method 1
a batch plating portion (42) comprising a hot dip plating, which is covering a periphery of the lateral winding shielding portion (41)
Data Source
AI summary
A coaxial cable is composed of a conductor, an electrical insulating member covering a periphery of the conductor, a shield layer covering a periphery of the electrical insulating member, and a sheath covering a periphery of the shield layer. The shield layer is configured to include a lateral winding shielding portion with a plurality of metal wires being helically wrapped around the periphery of the electrical insulating member, and a batch plating portion made of a hot-dip plating covering respective peripheries of the lateral winding shielding portion. The shield layer includes an outer peripheral portion, in which the metal wires are covered with the batch plating portion, and an inner peripheral portion, in which the metal wires are not covered with the batch plating portion. The outer peripheral portion of the shield layer includes intermetallic compounds between the metal wires and the batch plating portion.