Application Analysis of Extremely Fine Coaxial Cable Bundles in High-Speed Interfaces: A Comprehensive Interpretation of MIPI / USB3 / HDMI

In the fields of intelligent terminals, drone image systems, industrial vision, and portable display devices, high-speed signal transmission has become a core link in system design. As devices continue to advance towards thinness, miniaturization, and compactness, traditional wiring harnesses are difficult to meet the needs of high-speed, flexible, and compact wiring. The extremely thin coaxial cable (micro coaxial cable) has gradually become a potential solution for high-speed interfaces such as MIPI, USB3, and HDMI, thanks to its small size, excellent impedance control, and flexible structure.

The following will analyze the applicable scenarios and selection points of ultra-fine coaxial cable bundles from the perspectives of interface standards, performance features, and actual application requirements.

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I. Advantages and Limitations of Extremely Fine Coaxial Beam

Extremely fine coaxial cables are composed of an inner conductor, insulating layer, shielding layer, and sheath. The outer diameter can be as small as the millimeter level, naturally possessing good signal integrity and anti-interference performance, and having excellent flexibility, making them suitable for internal wiring in compact spaces. However, the smaller the wire diameter, the more prone it is to become a bottleneck in terms of insertion loss, crosstalk, and shielding capability in high-frequency scenarios; at the same time, excessive bending or frequent plugging and unplugging will reduce its mechanical life. Therefore, in practical applications, a balance needs to be achieved between performance, cost, and reliability.

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Analysis of applicability in mainstream high-speed interfaces

1. MIPI scenarios (camera modules, drones, embedded imaging)

The MIPI D-PHY / C-PHY data rates range from hundreds of Mbps to several Gbps, and they are mostly used for short-distance transmission. Very thin coaxial cables can effectively maintain impedance consistency and suppress skew within a few centimeters, and meet the requirements for compact structure and flexible wiring. They are an ideal solution for the camera module to the motherboard.

2. USB3 scenario (internal connection of high-speed module)

The speed of USB 3.x reaches 5-20Gbps and is extremely sensitive to insertion loss and crosstalk. Due to the high loss of extremely thin coaxial cables at ultra-high frequencies, their application is more suitable for internal short-distance interconnections of several centimeters to more than ten centimeters, and not suitable for use as external extension cables.

HDMI scenario (high bandwidth video module internal interconnection)
HDMI 2.0 / 2.1 have very high requirements for cable performance. Although there are already HDMI internal cables on the market that use extremely fine coaxial structures, they are mainly used for short-distance high-speed video signal interconnection within the equipment, rather than traditional long-distance external HDMI cables.

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Three, key considerations for actual selection

(1) Bandwidth and cable length matching: Determine the actual data rate and maximum cable length to avoid exceeding the loss limit of extremely thin coaxial cables.

(2) Impedance consistency: the impedance of the wire, shielding structure, and connector must be consistent to reduce reflections.

(3) Shielding and grounding design: Optimize the shielding layer structure and grounding point layout to enhance anti-interference performance.

(4) Connector selection: Pairing with high-precision miniature coaxial connectors can significantly improve the termination reliability.

(5) Mechanical reliability: Focus on the minimum bending radius, wire flexibility grade, and insertion/extraction life to ensure long-term stable operation.

Extremely thin coaxial cable束 performs excellently in MIPI camera, some USB3 internal short-distance interconnects, and HDMI module connections, especially suitable for short-distance, high-speed, and space-limited structural designs. However, when facing higher bandwidth or longer-distance applications, it is necessary to comprehensively evaluate signal integrity, shielding capability, and mechanical reliability. Through reasonable selection and strict process control, extremely thin coaxial cable束 can provide high-quality and high-stable high-speed interconnect capabilities for modern electronic devices.

I amSuzhou Huichengyuan Electronic Technology, long-term focused on the design and customization of high-speed signal cables and ultra-fine coaxial cables, committed to providing reliable high-speed interconnection solutions. For selection advice or technical support, please contact Manager Yin:18913280527 (WeChat same number)。