Ultra-fine coaxial cable internal structure analysis and application guide

With the continuous development of miniaturized electronic devices, there is an increasing demand for high-speed signal transmission and space utilization in electronic products. Under this trend, ultra-thin coaxial cables (micro coaxial cable) have become an indispensable key component in high-end products such as smart terminals, camera modules, medical probes, and AR/VR devices, thanks to their excellent signal performance, flexibility, and anti-interference ability. Understanding its internal structure is of great significance for selection, design, and maintenance.

 

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Conductor inside

The inner conductor is located at the center of an extremely thin coaxial cable, usually made of silver-plated copper or tin-plated copper wire, used for transmitting electrical signals. It is like the main lane of an information highway, carrying all the signal traffic. The purity of the material and the surface treatment of the inner conductor directly affect the signal attenuation and transmission quality, which is the core of ensuring high-speed, low-loss transmission.

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Insulation layer

The insulating layer is wrapped on the outer side of the inner conductor, and commonly used materials include high dielectric strength materials such as polytetrafluoroethylene (PTFE) and polyethylene (PE). Its main function is to isolate the inner conductor from the shielding layer, prevent short circuits, and maintain a stable characteristic impedance, thus ensuring signal integrity. In high-speed signal transmission, the uniformity and stability of the insulating layer are crucial for transmission performance.


 

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Three, shielding layer

The shielding layer is a key factor in the anti-interference performance of ultra-fine coaxial cables. Usually, copper braided layer, aluminum foil layer, or multi-layer combined design is adopted to resist external electromagnetic interference (EMI) and prevent signal leakage. In applications with extremely high signal requirements, such as medical probes, camera modules, and AR/VR devices, the design of the shielding layer directly determines the stability and reliability of signal transmission.

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Four, outer sheath
The outer sheath is located at the outermost layer and mainly serves the purposes of mechanical protection and environmental protection. The sheath material is usually made of wear-resistant and flexible high polymer materials, which not only ensures the flexibility of the cable harness but also resists dampness, chemical corrosion, and physical impact, thereby extending the service life of the cable harness.

Extremely thin coaxial cables, although their diameter is only millimeters or even sub-millimeters, have a clear internal structure and complementary layers. The inner conductor is responsible for signal transmission, the insulating layer ensures characteristic impedance, the shielding layer provides anti-interference protection, and the outer sheath extends service life. It is this precise structure that enables extremely thin coaxial cables to achieve high-speed, stable, and low-loss signal transmission in complex environments.

I am[Suzhou Huichengyuan Electronic Technology]Long-term focus on the design and customization of high-speed signal cable harnesses and ultra-fine coaxial cable harnesses, committed to providing stable and reliable high-speed interconnect solutions. If you have related needs or want to learn more, please contact us:Manager Zhang 18913228573 (WeChat number the same)。