Small-Diameter Coaxial Cable Shielding with Mixed-Diameter Strands
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Solution Overview
Problem
Conventional coaxial cables fail to balance flexibility, stable shielding characteristics, and a thin diameter while maintaining high productivity, particularly in high-frequency applications.
Innovation Solution
A coaxial cable design featuring an outer conductor formed by laterally winding strands with a 10% or more difference in outer diameter, which are compressed to prevent gaps and enhance shielding, allowing for a smaller diameter and improved flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braided structure is used for the outer conductor to improve shielding characteristics, then shielding performance is enhanced, but the outer diameter increases and flexibility deteriorates
Solution Approach 1:
The invention changes the structural parameters of the outer conductor by using a lateral winding structure instead of a braided structure. This parameter change allows the outer conductor to maintain shielding characteristics while reducing outer diameter and improving flexibility, directly resolving the contradiction between shielding performance and ease of operation.
Solution Approach 2:
The invention inverts the conventional braided structure approach by adopting a lateral winding structure. Instead of braiding strands together, the strands are wound laterally around the insulator in a single direction, which fundamentally changes the structural configuration to achieve both good shielding and flexibility simultaneously.
2Ease of operation
If a lateral winding structure is used for the outer conductor to improve flexibility, then flexibility is enhanced, but shielding characteristics deteriorate
Solution Approach 1:
The invention optimizes the parameters of the lateral winding structure by controlling the strand arrangement, winding tension, and outer conductor density. These parameter adjustments ensure that the lateral winding structure achieves both flexibility and adequate shielding characteristics, resolving the contradiction between ease of operation and reliability.
3Reliability
If two lateral windings are provided to improve shielding characteristics while maintaining flexibility, then shielding performance is enhanced, but the outer diameter increases and productivity decreases
Solution Approach 1:
The invention merges the shielding function and flexibility requirement into a single lateral winding structure rather than using two separate windings. This consolidation maintains the necessary shielding characteristics while improving productivity by simplifying the manufacturing process and reducing the number of production steps.
4Reliability
If strands with different outer diameters are mixed and laterally wound to improve shielding characteristics, then shielding performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The invention applies local quality by using strands with different outer diameters at different positions within the outer conductor. This creates varying compression effects and contact areas between strands, which enhances shielding characteristics while the overall structure remains relatively simple to manufacture.
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 achieves superior shielding characteristics and flexibility while maintaining a smaller diameter, outperforming conventional braided and double lateral winding structures, with efficient compressive force transmission and reduced friction between strands.
Implementation Method 1
the strands can be compressed without applying excessive load, gaps are not generated between the strands, leakage of electromagnetic waves and intrusion are suppressed
Data Source
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Figure 3(a)~3(b)
AI summary
The present invention relates to a coaxial cable, and particularly to a small-diameter coaxial cable for use in frequency bands of 100 MHz or more. The present invention addresses the problem of providing a coaxial cable which has excellent flexibility, a small outer diameter, and excellent shielding characteristics. The problem is solved by a coaxial cable having an outer conductor which is formed by mixing and laterally winding strands in the same direction, the strands having an outer diameter difference of not less than 10% between a strand having a maximum outer diameter(large-diameter strand) and a strand having a minimum outer diameter(small-diameter strand).