How to achieve stable and high-speed performance in DisplayPort 2.1? Extremely thin coaxial cable bundle provides the answer.

With the continuous upgrade of the DisplayPort (DP) standard, the bandwidth requirements for high-speed display interfaces have been rising steadily, from DP1.1 to the current DP2.1, with the single-channel rate reaching 20Gbps and the total bandwidth exceeding 80Gbps. Along with the increase in bandwidth, the challenges faced by the signal transmission chain also intensify. Traditional cables are difficult to balance high speed, low loss, and anti-interference. Against this backdrop, ultra-thin coaxial cable束 (Micro Coaxial Cable) has gradually become an important high-speed transmission solution for notebooks, docks, high-end monitors, and industrial vision equipment.

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Part 1: Challenges in the Transmission of High-Speed Signals for DisplayPort (DP)

DP adopts a differential transmission structure, relying on paired signal lines for high-frequency data transmission. As the rate increases to several GHz and even higher frequency bands, even minor changes such as line length, impedance deviation, and bending radius of the wire material can cause serious signal degradation, triggering issues such as screen flickering, screen distortion, and training failure. Traditional FPC or twisted pair cables have excessive losses in high-frequency environments, making it difficult to meet the latest DP2.0/2.1 high-speed standards. Therefore, a more stable and accurate transmission medium has become an inevitable demand.

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Why ultra-fine coaxial cables are more suitable for high-speed DP transmission

The ultra-fine coaxial cable is composed of a central conductor, insulation layer, independent shielding layer, and outer sheath. Its core advantage lies in the fact that each channel has separate shielding, resulting in extremely low crosstalk and significantly better signal integrity compared to other cable structures. The wire diameter is typically between 0.3mm and 0.5mm, making it easy to pass through compact structures such as laptops and tablets, while also enabling strict differential impedance control (usually 100Ω ±10%), which is highly suitable for DP differential signal consistency requirements. This structure enables it to maintain cleaner eye diagrams, lower losses, and stronger anti-interference performance during high-speed transmission.

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Three, the ultra-fine coaxial cable's support capability for DisplayPort 2.1

DP2.1's speed reaches up to 80Gbps, which puts higher requirements on the cable. High-quality micro coaxial cables can already stably support DP2.0/2.1, the key lies in the improvement of materials and processes, including:

Conductor material optimization: choose silver-plated copper or high-purity copper to reduce high-frequency loss.

Medium material upgrade: Low dielectric materials such as FEP, PTFE can reduce delay and frequency loss.

3. Shielding structure reinforcement: Double-layer (aluminum foil + woven) shielding can achieve nearly 90dB of suppression performance.

High-speed eye diagram stability is ensured by strictly consistent wire diameter and impedance control.

Currently, high-end monitors, Thunderbolt expansion docks, industrial AI camera modules, and other products have all widely adopted the micro coax solution to meet the requirements of DP2.1 for high speed and stability.

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With the continuous improvement of display resolution and refresh rate, the trend of high-speed DisplayPort is becoming more and more obvious. The ultra-fine coaxial cable bundle, with its advantages of low loss, low crosstalk, high shielding, and flexible structure, has become the most promising solution for high-speed transmission in DP2.0/2.1. Compared with FPC and twisted pair, micro coax has more prominent signal integrity and reliability under high-frequency conditions, and will continue to play an important role in high-end display, thin and light devices, and AI image systems.

I amSuzhou Hui Cheng Yuan Electronic Technology,Long-term focused on the design and customization of high-speed signal cables and ultra-fine coaxial cables, committed to providing stable and reliable high-speed interconnection solutions. If you have any related needs or want to learn more, please contact Manager Zhang:18913228573 (WeChat number)。