Delay control in ultra-fine coaxial cable束: A key link for stable high-speed signal transmission

In the field of high-speed data transmission, signal integrity has become a core consideration in system design. With the continuous increase in data rates, the importance of delay control becomes more and more prominent. Whether it is in smartphones, tablets, or in precision equipment such as in-vehicle displays and medical endoscopes, **micro coaxial cable (micro coaxial bundle)** has become the preferred solution for high-speed signal transmission with its small size, high flexibility, and excellent shielding performance. However, when the speed reaches the level of several Gbps, the problem of excessive delay or imbalance often directly affects the reliability and display quality of the system.

The source of delay
The signal delay mainly depends on the propagation speed of the signal in the transmission medium, which is closely related to the dielectric constant, cable geometric structure, and processing consistency. For extremely thin coaxial cables, if there is a slight difference in propagation time for each wire in multi-channel parallel transmission, a "skew" phenomenon will occur, leading to signal synchronization imbalance, data distortion, and even error codes.

Two, key means of delay control
Precision structural control
Ensure concentricity between the inner conductor, dielectric layer, and shielding layer through high-precision manufacturing processes, so that the signal path remains stable and consistent, and minimize the time delay difference caused by geometric deviation to the maximum extent.
Low-loss medium selection
Using insulating materials with low dielectric constant and low loss factor can significantly improve signal propagation speed and reduce overall latency.
Channel line length matching
In multi-channel transmission design, strictly maintain the same length for each cable to prevent the signal arrival time from being out of sync and ensure the synchronization of multi-path signals.
4. Impedance precise control
Maintaining a consistent characteristic impedance not only reduces signal reflection and distortion but also indirectly improves timing consistency, enhancing the overall performance of high-speed links.

Chapter 3 Experience in Engineering Practice
In high-speed interfaces between mobile terminals and display modules, such as MIPI and eDP connections, extremely thin coaxial cable bundles are widely used. The speed of these interfaces usually reaches several Gbps, and any minor delay difference may cause screen tearing, latency, or display anomalies. Therefore, engineers not only focus on the consistency of the cable itself during design, but also combine connector impedance matching and layout optimization to jointly build a stable high-speed transmission channel.

The delay control of ultra-fine coaxial beam in high-speed signal transmission is a systematic subject that integrates materials science, structural design, and manufacturing technology. Only by fully considering delay matching and signal integrity in the initial design phase can truly stable, high-speed, and low-error transmission performance be achieved.
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