Loss control of ultra-fine coaxial cable束 under high-frequency transmission full analysis

With the development of high-speed communication and microelectronic devices, micro coaxial cable is widely used in high-frequency signal interconnection due to its compact structure, strong anti-interference ability, and stable transmission performance. However, as the transmission frequency continues to increase, signal loss has become a key factor affecting system performance. How to effectively control high-frequency loss while maintaining the lightweight and flexibility of the micro cables is a key issue that engineers are concerned about.

The main sources of loss
Insertion loss
The center conductor of a very thin coaxial cable has a very small diameter. As the signal frequency increases, the current concentrates on the surface of the conductor (skin effect), resulting in a reduction of the actual conductive area and thus increasing transmission loss. At the same time, the longer the cable, the more obvious the signal attenuation will be.
Reflection loss and impedance mismatch
In high-frequency systems, if the impedance of the coaxial cable does not match the connector or interface, it will generate reflected signals, causing power loss and waveform distortion. Ensuring the impedance consistency throughout the entire link is a key measure to reduce reflection loss.
Electromagnetic interference (EMI) and crosstalk
The extremely thin coaxial cable束 has certain shielding capabilities, but if the shielding design is not proper, external electromagnetic noise or crosstalk between adjacent cables may affect signal stability. Especially in complex environments such as vehicles and industries, electromagnetic interference issues are more prominent.
Radiation and shielding coverage insufficient
At high frequencies, insufficient weaving density of the shielding layer may cause radiation loss. The use of aluminum foil or multilayer composite shielding structures can significantly improve signal integrity and effectively suppress energy leakage.

Effective Methods to Reduce Losses
Optimal conductor and insulating materials
Using low-resistance conductors (such as oxygen-free copper or silver-plated copper) can reduce conductor losses; selecting insulating materials with low dielectric loss (such as PTFE or foamed polyethylene) can reduce dielectric energy absorption and improve signal transmission efficiency.
Strengthen the shielding structure design
The use of multi-layer shielding (combining weaving and aluminum foil) can not only enhance the anti-interference performance, but also improve the electromagnetic compatibility while maintaining flexibility.
Reasonably control line length and bend radius
In route design, shortening the transmission path and adhering to the minimum bending radius of the cable can effectively reduce insertion loss and impedance deviation caused by structural deformation.
Precision termination and impedance matching
High-frequency systems have extremely high requirements for connection technology, which necessitates precise stripping, crimping, and termination processes to ensure continuous impedance along the entire link, thereby reducing reflection and standing wave issues from the root.
5. Multi-core flexible harness assembly
Combining multiple miniature coaxial cables in a reasonable structure can further suppress common-mode interference while maintaining low loss, enhancing signal stability.
Suppression of common-mode noise and ground interference
Adding ferrite magnetic rings or a balanced-unbalanced converter (Balun) in system design can effectively reduce common-mode interference and improve the purity of high-frequency signal transmission.

In high-frequency transmission environments, the loss control of extremely thin coaxial cable bundles is a systematic engineering project, involving the collaboration of materials, electrical design, and technology. By optimizing the conductor structure, reinforcing the shielding, and strictly matching the impedance, stable and low-loss high-speed signal transmission can be achieved while maintaining the advantages of cable miniaturization.
I am[Suzhou Huichengyuan Electronic]Focused on the customization and design of high-speed cable harnesses and ultra-fine coaxial cables, committed to providing high-reliability high-speed interconnect solutions. If you need technical support or a customized solution, please contact us:Manager Zhang 18913228573 (WeChat same number)。