The "Invisible Champion" of High-Speed Signals: Why Do Super-Thin Coaxial Cables Become the Preferred Choice for Differential Transmission?

As electronic devices continue to evolve towards thinness and miniaturization, both high-definition displays, camera modules, and 5G communication and high-speed data interfaces place more stringent requirements on the signal performance and dimensional design of cables. Among various cable solutions, ultra-thin coaxial cables (Micro Coaxial Cable) stand out with their excellent signal integrity and superior anti-interference capabilities, becoming the "hidden giant" in high-speed differential signal transmission. Why can it stand out in complex high-speed transmission scenarios? Let's take a look together!

What is ultra-fine coaxial cable?
Micro coaxial cable is a coaxial structure cable with an ultra-fine diameter, commonly with an outer diameter of only 0.3mm~1.0mm. It consists of four parts: the inner conductor, insulating layer, shielding layer, and outer sheath. The structure is similar to that of traditional coaxial cables, but it excels in size and flexibility, enabling high-density wiring in confined spaces.

What is differential signal?
Differential Signal is a method of transmitting equal-amplitude, inverse-phase electrical signals through two conductors. At the receiving end, data is recovered by comparing the voltage difference between the two signal lines, rather than referencing the ground potential of a single signal line. This signal transmission method is commonly used in high-speed applications such as MIPI, USB 3.x, PCIe, SATA, DisplayPort, and automotive camera interfaces.
Its main advantages include:
  Strong anti-interference ability
Good signal integrity
Suitable for high-speed, high-frequency signal transmission

Why choose ultra-fine coaxial cable to transmit high-speed differential signals?
In high-speed signal transmission, common solutions include twisted pair (Twisted Pair) and ultra-fine coaxial cable (Micro Coax).
But when products pursue high density, small size, and ultra-high signal integrity, Micro Coax obviously has more advantages.
The main reasons are as follows:
Precision Impedance Control
Extremely thin coaxial cables can strictly control the characteristic impedance of each conductor (commonly 50Ω or 100Ω differential), ensuring that reflections and standing waves are minimized during signal transmission, thereby reducing signal distortion.
Single-line independent shielding, stronger anti-interference
Each axis has an independent metal braid or foil shielding layer, which can effectively isolate crosstalk between adjacent signals, maintaining a high purity of differential signals.
High bandwidth and high-speed transmission capability
Micro Coax can support high-speed differential signal transmission of several GHz even above 10Gbps, with low signal attenuation, low jitter, and stable and reliable transmission.
Excellent flexibility, adaptable to compact spaces
Its excellent flexibility allows it to freely route in structures with extremely small internal spaces such as smartphones, laptops, VR devices, and vehicle-mounted cameras without losing performance.

With its comprehensive advantages such as precise impedance control, strong anti-interference, high bandwidth, and excellent flexibility, the ultra-thin coaxial cable (Micro Coaxial Cable) has become an ideal solution for high-speed differential signal transmission. It is widely used in products that have extremely high requirements for signal integrity and space utilization, and has become an indispensable key connecting component in modern high-frequency electronic equipment.
We have been focusing on the design and customization of high-speed signal cable harnesses and extremely thin coaxial cable harnesses for a long time, committed to providing stable and reliable high-speed interconnect solutions. If you have any related needs or would like to learn more, please contact: Yin Manager.18913280527 (WeChat number)。