With the increasing demand for high-speed data and high-power supply from devices such as laptops, docks, and monitors, the USB4 standard has achieved a leap from 40Gbps to 80Gbps. This is not only a doubling of speed but also means the combination of high-speed video transmission, multi-functional collaboration, and high-power PD charging. To achieve stable operation at 80Gbps, the key lies in the cable scheme, especially the design and application of extremely thin coaxial cables (micro coaxial cable).
Part 1: Challenges of USB4 High-Speed Transmission
80Gbps data rate corresponds to signal frequencies reaching tens of GHz. Under such high bandwidth, any impedance mismatch, signal reflection, or crosstalk will affect the transmission quality. Traditional twisted pair cables are approaching their limit in this frequency range, while high-speed data, video signals, and high-power PDs require the cable束 to have a more precise structure, stronger shielding, and lower loss for simultaneous transmission. Therefore, micro coaxial cable has become the core transmission medium for USB4 docking stations.
Advantages of ultra-fine coaxial beam
High shielding and low crosstalk: Each signal line is independently shielded, effectively reducing crosstalk between adjacent signals and improving signal integrity.
2. Impedance stability and low loss: Precise coaxial structure ensures stable characteristic impedance, reducing reflection and signal distortion.
Flexible and compact: The microfine wire diameter can be flexibly routed in confined spaces, enhancing the slimness and structural reliability of the device.
Through these characteristics, ultra-fine coaxial cables show significant advantages in the simultaneous transmission of USB4 high-speed data, video, and high power.
Key Designs for Achieving Stable 80Gbps Transmission
Accurate impedance matching: Differential signal channels must maintain a characteristic impedance of 90Ω or 100Ω to reduce insertion loss and reflection.
Strategies for shielding and grounding: multi-layer shielding and reasonable grounding reduce EMI and ensure stable transmission of multi-port expansion docks.
Optimization of connectors and interfaces: high-precision welding and shielded connector design enhance interface reliability.
4. Multi-functional collaborative design: The wire needs to carry high-speed signals and high current, ensuring heat resistance, bend resistance, and low resistance performance.
Combining harness length optimization, wiring direction unification, and manufacturing consistency, USB4 can fully unleash its 80Gbps performance in actual products.
The arrival of USB4 is not only an interface upgrade but also a revolution in high-speed interconnection structures. The ultra-thin coaxial cable bundle (micro coaxial cable) with high shielding, low loss, and flexible wiring characteristics, has become a key guarantee for USB4 docking stations, lightning cables, and high-speed video solutions. Choosing high-quality ultra-thin coaxial cable bundles is the foundation for achieving high-speed, stable, and reliable transmission.
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[Suzhou Huichengyuan Electronic Technology], long-term focus on the design and customization of high-speed cable harnesses and ultra-thin coaxial cable harnesses, providing customers with stable and reliable high-speed interconnection solutions. For more information or customization, please contact
Manager Zhang: 18913228573 (same number for WeChat)。
