Coaxial Cable Shield Structure for 5G Shieldability and Windability
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Solution Overview
Problem
Coaxial cables used in in-device antenna wiring and semiconductor devices compatible with the 5G standard face challenges in achieving sufficient shieldability and processability, particularly with existing external conductor designs that suffer from inadequate shielding, complex grounding processes, and difficulties with copper foil tape windability.
Innovation Solution
The coaxial cable incorporates a lateral winding shield with metal fine wires and a metal layer double-sided resin tape, where metal layers are disposed on both sides of the tape, allowing for efficient electrical conduction and eliminating the need for further grounding of the outer metal layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a thin copper layer (6 μm) is used in the external conductor, then the diameter and flexibility are improved, but the shielding effect becomes insufficient
Solution Approach 1:
The patent combines multiple copper layers (first copper layer of 6 μm and second copper layer of 6 μm) to form a composite external conductor structure. By merging these layers with the lateral winding shield, the total metal amount reaches 12 μm or more, achieving both small diameter and sufficient shielding effect through cumulative metal thickness.
2Object-affected harmful factors
If multiple layers of resin tape with copper layers are wound to increase metal amount, then the shielding effect is improved, but the grounding process becomes complex
Solution Approach 1:
The external conductor is segmented into distinct functional layers: a lateral winding shield and multiple resin tape layers with copper layers. This segmentation allows each layer to be optimized independently while simplifying the overall grounding process, as the structured arrangement enables straightforward electrical connection without complex inter-layer grounding requirements.
3Object-affected harmful factors
If copper foil tape with thickness of 15 μm is used, then the shielding effect is improved, but the windability and processability deteriorate
Solution Approach 1:
The patent changes the thickness parameter of individual copper layers from thick (15 μm) to thin (6 μm each), while increasing the number of layers to achieve cumulative thickness of 12 μm or more. This parameter change maintains shielding effectiveness while dramatically improving windability and processability, as thinner layers are more flexible and easier to handle during manufacturing.
4Object-affected harmful factors
If the total metal amount is increased to 12 μm or more, then the shielding effect is improved, but the number of layers and grounding requirements increase
Solution Approach 1:
The resin tape layers serve multiple functions simultaneously: they provide electrical insulation between copper layers, mechanical support for the external conductor structure, and a substrate for the copper shielding layers. This multi-functionality reduces the need for additional dedicated insulation layers, simplifying the overall structure despite multiple copper layers.
Data Source
AI summary
To provide a coaxial cable having excellent shieldability and processability of an external conductor.The above-described problem is solved by a coaxial cable comprising a center conductor (11), an insulator (12) provided on an outer periphery of the center conductor (11), an external conductor (13, 14) provided on an outer periphery of the insulator (12), and an outer coated body (15) covering the external conductor (13, 14). The external conductor (13, 14) is constituted by the lateral winding shield (13) provided with metal fine wires laterally wound on the outer periphery of the insulator (12), and the metal layer double-sided resin tape (14), with metal layers disposed on both sides, wound on the lateral winding shield (13).