Today, as devices continue to evolve in the direction of miniaturization and high bandwidth, USB3.0 has become a high-speed interface standard for various industrial cameras, AI devices, AR/VR, and robotic systems. However, as the internal space of the device becomes more and more compact, the traditional USB wire is gradually difficult to meet the demand in terms of volume, flexibility and interference control. Therefore, many engineers begin to pay attention to whether the extremely fine coaxial line (Micro Coax) can bear the high-speed transmission of USB3.0?

The answer is: absolutely, and in more and more scenarios, Micro Coax has become the better solution.

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1. why USB3.0 wire so "picky"?

USB 3.0 has a transfer rate of 5Gbps, which means that data travels at a very high frequency in the wires. At this time, the performance of the wire determines whether the interface can run stably at full speed. If the wire index does not meet the standard, there will be: speed drop to 2.0 mode, transmission drop, intermittent disconnection, EMI exceeding the standard, screen jamming and frame loss in industrial control cameras. The root cause of these problems is that high-speed differential signals are extremely sensitive to the following indicators: impedance consistency, crosstalk control, high-frequency loss (Insertion Loss), reflection (Return Loss), shielding and anti-interference capability; Therefore, USB3.0 is not "just a line" can be transmitted.

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Why 2. Micro Coax is more suitable for USB3.0?

The extremely thin coaxial line is composed of a center conductor, an insulating layer, a shielding layer and an outer sheath. Each layer structure is designed for high-frequency transmission, which makes it a natural advantage in USB3.0 applications.

2.1. Structure determines performance: impedance is more accurate

The characteristic impedance of USB3.0 is required to be 90Ω ± 10%. The coaxial structure of Micro Coax makes impedance consistency very easy to control, which is impossible for cable and ordinary twisted pair.

2.2, low loss, making 5Gbps operation easier:

Micro Coax maintains low insertion loss and reflection in high frequency band, enabling USB3.0 data to run stably at full speed under the internal length of common modules such as 20-50cm. In particular, specifications such as 42AWG and 46AWG have been verified and mature in mobile phones and industrial camera modules.

: 2.3 and stronger anti-interference ability:

The high speed in USB3.0 is extremely sensitive to EMI, while the shielding structure of Micro Coax (braided shielding aluminum foil) can effectively reduce crosstalk between adjacent lines, environmental noise interference and high frequency leakage. It is very suitable for complex systems with metal shell, motor and wireless module concentration.

2.4, high flexibility, suitable for small space applications:

Micro Coax can realize extremely small bending radius, light, soft and thin wire diameter, which is especially important in these equipment: modular industrial camera, AR/VR head display, unmanned aerial vehicle, handheld terminal and robot joint wiring. Traditional USB wire cannot complete layout in these narrow spaces at all.

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Is there a limit to 3. very fine coaxial harnesses? Attention of Micro Coax

Although it is suitable for USB3.0, there are still several engineering points to note when using Micro Coax:

3.1. The line length should not be too long: the recommended length should not exceed 1 meter, because the high frequency loss will increase significantly with the length.

3.2, high processing requirements: need to use professional equipment for precision welding, shielding treatment, impedance matching, this kind of wire harness must be produced by experienced factories, otherwise the performance is difficult to guarantee.

3.3, the cost is higher than ordinary wire, but in high-speed applications, this cost difference is to pay for reliability, which is completely necessary.

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With the continuous improvement of equipment requirements for high speed, miniaturization and stability, the extremely thin coaxial line is becoming the optimal solution for USB3.0 internal wiring harness. It can not only provide accurate impedance, low loss and strong anti-interference ability, but also maintain flexibility and reliability in limited space. For products that pursue higher performance and higher integration, Micro Coax is not only "available", but also an important direction for the design of high-speed transmission harness in the future.

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Thunderspeed extremely fine coaxial wire harness netBelongableSuzhou Huicheng Yuan Electronic Technology Co., Ltd.，We focus onVery fine coaxial wire harnessThe company is deeply engaged in the field of high-speed transmission, with mature manufacturing technology, strict quality management system and rich industry application experience, products are widely used in consumer electronics, industrial control, medical equipment, intelligent security and other fields. We welcome customers in various industries to contact us at any time.