Today's intelligent terminals are becoming thinner and lighter, but their functions are becoming more powerful. From smartphones, tablets, to wearable devices, drones, security monitoring, and medical imaging systems, the internal cables of the devices are also facing higher requirements. Among them, the ultra-fine coaxial cable (Micro Coaxial Cable) is becoming the core choice in the fields of consumer electronics and medical electronics, thanks to its advantages of high-density wiring, high-speed signal transmission, and ultra-thin, ultra-soft structure. In fact, the material configuration of a performance-stable ultra-fine coaxial cable bundle is a subject of great学问. Today, we will explore the key components and material considerations of micro coaxial cable from the perspective of materials.
What is a micro coaxial cable束？
Before discussing the material, let's first understand its structure.
The extremely thin coaxial cable is usually composed of four layers: conductor (Inner Conductor) — insulation (Insulation) — woven shielding layer (Shield) — outer sheath (Jacket). Each layer plays a crucial role, and the selection of materials is strictly demanding.
Part two: Common materials and considerations for ultra-fine coaxial cables
Conductor: Responsible for the "high-speed channel" of signals
Common materials: silver-plated copper wire, bare copper, tin-plated copper
Material quality is emphasized.
Silver-plated copper has excellent high-frequency transmission performance and is the first choice for high-speed data scenarios such as mobile phone camera module lines and display FPC connectors.
Copper has good conductivity but weak anti-oxidation ability, which is prone to performance degradation after long-term use.
Tin-plated copper has excellent corrosion resistance and welding performance, suitable for working conditions that require frequent bending or multiple welding.
Insulation layer: Ensuring the purity and stability of the signal
Common materials: FEP, PFA, PE
Material requirements:
FEP and PFA have excellent high temperature resistance, corrosion resistance, and dielectric properties, and are commonly used in medical imaging, high-end industrial equipment, and aerospace fields.
The cost of PE is relatively low, making it suitable for general consumer electronic devices and offering better cost-performance in scenarios with low temperature resistance requirements.
Weave a shielding layer: the key armor against electromagnetic interference
Common materials: silver-plated copper wire, tin-plated copper wire, bare copper wire
Material matters:
The higher the weaving density, the stronger the shielding performance, which can effectively weaken external electromagnetic interference.
Silver-plated copper wire not only has excellent shielding effect, but also has excellent corrosion resistance, and is commonly used as shielding material in high-end equipment.
4. Outer sheath: the first line of defense for the internal structure
Common materials: TPU, PVC, FEP
Material emphasis:
TPU is flexible, wear-resistant, and has a good feel, and is commonly used in wearable devices or applications with high requirements for bending life.
The FEP has characteristics of high-temperature resistance and resistance to chemical corrosion, and is suitable for complex working conditions and medical scenarios.
PVC is cost-effective and easy to process, but it has relatively poor environmental performance and durability, and has gradually exited the high-end market.
Why is material selection so important?
Extremely thin coaxial cables are commonly used in high-speed, high-precision, and miniaturized equipment, where material requirements are naturally extremely stringent. Improper material can lead to:
Signal attenuation, unstable picture quality or data transmission.
Poor bending resistance, leading to reduced cable life or断裂.
• Insufficient shielding performance, causing crosstalk, affecting overall system performance.
Poor heat resistance, prone to aging or cracking during welding.
Therefore, a high-quality ultra-fine coaxial cable束 must integrate structural design, material selection, and process control.
Each layer of material in the extremely fine coaxial cable is a key factor in performance. The conductor must ensure high-speed transmission, the insulating layer must be stable and reliable, the shielding layer must be effective against interference, and the outer sheath must be wear-resistant and temperature-resistant. Only by reasonably selecting materials based on actual applications can the Micro Coaxial Cable fully utilize its maximum performance advantages.
We have been focusing on the design and customization of high-speed cable harnesses and extremely thin coaxial cable harnesses for a long time, committed to providing customers with stable and reliable high-speed interconnect solutions. If you have related needs or would like to learn more, please contact: Yin Manager.
18913280527 (WeChat same number)。
