Coaxial Cable Rib Width Gradient for Lateral Pressure Resistance
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Solution Overview
Problem
Coaxial cables with small diameters used in compact antennas face crushing due to lateral pressure, compromising their structural integrity while requiring high-frequency transmission performance.
Innovation Solution
A coaxial cable design featuring a hollow-core-body with thermoplastic resin, radial rib portions, and outer reinforcing portions, optimized to enhance lateral pressure strength while maintaining stable high-frequency transmission performance by controlling rib width ratios and reinforcing structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the diameter of the coaxial cable is reduced to fit compact antennas, then the cable can be used in smaller electronic equipment, but the hollow-core-body becomes susceptible to crushing by lateral pressure
Solution Approach 1:
The patent applies local quality by varying the rib width along the axial direction of the hollow-core-body. The rib width is set to a minimum value near the inner annular portion and a maximum value at the outer end, creating a gradient structure (with size ratios of 1:1.6 to 1:3.0). This localized variation in geometry provides enhanced lateral pressure resistance at the outer end where crushing is most likely to occur, while maintaining a compact overall diameter.
2Strength
If the rib width is increased to strengthen the hollow-core-body, then lateral pressure strength improves, but the high frequency transmission performance may deteriorate
Solution Approach 1:
The patent resolves this contradiction by applying different rib widths at different locations. The minimum rib width near the inner annular portion maintains low dielectric constant and good high frequency transmission performance, while the maximum rib width at the outer end provides the necessary lateral pressure strength. This spatial differentiation allows both requirements to be satisfied simultaneously.
Solution Approach 2:
The patent applies partial action by providing outer side reinforcing portions only at specific locations (the outer end of the rib portions) rather than uniformly throughout. The reinforcing portions are strategically placed where lateral pressure resistance is most needed, while other regions maintain their original dimensions to preserve electrical performance.
3Strength
If outer side reinforcing portions are added to the rib portions, then lateral pressure strength increases, but the structural complexity increases
Solution Approach 1:
The patent merges the reinforcing portions with the existing rib portions of the hollow-core-body, forming an integrated structure. The outer side reinforcing portions are continuous with the rib portions and are formed as a single integral thermoplastic resin structure, eliminating the need for separate reinforcement components and reducing overall structural complexity.
Solution Approach 2:
The patent changes the geometric parameters of the rib portions by varying the rib width along the axial direction and adding outer side reinforcing portions. This parameter variation achieves enhanced strength without introducing fundamentally new structural elements, maintaining manufacturing simplicity while improving performance.
Data Source
AI summary
A coaxial cable 10 includes a hollow-core-body 1 having an integral structure of thermoplastic resin including an inner annular portion 2 that insulation-coats an inner conductor 12, a plurality of rib portions 3 that radially extend from the inner annular portion 2, and an outer annular portion 4 that is connected to outer ends of the rib portions 3; three or more gap portions 5 surrounded by the inner annular portion 2, the rib portions 3, and the outer annular portion 4; and outer side reinforcing portions 7 being formed on both sides of an outer end in the rib portion 3, in which a size ratio of a minimum value W1 of a rib width in the rib portion 3 and a maximum value W2 of the rib width in the rib portion 3 is within a range of 1:1.6 to 1:3.0.