From 6Gbps to 40Gbps, the importance of extremely fine coaxial cable bundles in the era of high-speed transmission has been fully upgraded.

In today's era of the full entry into the **"high-speed era"** of electronic devices, from USB4, Thunderbolt 4, to PCIe 5.0, MIPI D-PHY, and eDP HBR3, interface bandwidth is increasingly high. However, many engineers have encountered such confusion during the debugging process: the chip performance meets the standards completely, and the simulation data is perfect without any errors, but once the whole machine assembly stage is reached, the signal quality frequently goes wrong.
Where is the problem? — The answer is often hidden in the most easily overlooked place: cables.

The bottleneck is not in the chip, but in the "physical layer."
In high-speed interface transmission, it is not only the chip performance that determines the signal integrity, but also the comprehensive performance of the entire channel. This channel includes PCB routing, connectors, and cable structure.
In the era of low-speed applications, traditional multi-core wires, FFC, ribbon cables, and other solutions can still meet the requirements. However, when the rate exceeds 6Gbps, 10Gbps, and even higher, issues such as crosstalk, reflection, insertion loss, and impedance discontinuity will be infinitely amplified. Even a few centimeters of error may lead to eye diagram collapse and increased bit error rate, ultimately triggering system anomalies.
This means that in high-speed signal systems, "the details of the physical layer" determine success or failure.

Why "wire material" has become the biggest shortcoming of high-speed transmission
Wire diameter and medium loss issue:
In high-frequency environments, traditional copper wires exhibit skin effect, with signals only propagating on the surface of the conductor, reducing the effective transmission area and causing an increase in insertion loss.
Inaccuracy in shielding and impedance control
High-speed differential signals require strict characteristic impedance matching (such as 90Ω or 100Ω). Ordinary wire materials are difficult to achieve consistent matching throughout, which is prone to cause reflections and timing differences, and in severe cases, even data misalignment.
Flexibility and bending issue:
High-speed equipment has a compact internal space, and the wiring harness often needs to be bent repeatedly. After multiple folds, the shielding layer of ordinary wire material is prone to damage, which leads to a decrease in EMI performance, thus affecting the integrity and long-term stability of the signal.
In summary, the most vulnerable link in a high-speed signal system is often not the chip or protocol, but that unremarkable connection cable.

Section 3: Unique Advantages of Micro Coaxial Cable
The extremely thin coaxial cable (Micro Coaxial Cable) is specifically designed for high-speed signal transmission. Each signal line has an independent shielding layer, enabling it to maintain excellent electrical performance and anti-interference ability in a compact space.
Characteristic impedance controllable: Can be precisely designed as 50Ω single-ended or 100Ω differential, ensuring minimum signal reflection.
Low-loss medium: commonly used FEP, PTFE and other high-frequency insulating materials, insertion loss is much lower than that of ordinary cables.
High flexibility structure: Suitable for wiring in narrow spaces such as laptops, camera modules, industrial displays, AI modules, etc.
With the popularization of 8K image transmission, AI edge computing, and autonomous driving systems, micro coaxial cable is gradually replacing traditional wiring harnesses and becoming the key channel for "the last mile" of high-speed interfaces.

The performance bottleneck of high-speed interfaces is often not "insufficient bandwidth," but rather a mismatch in transmission channels. When the rate reaches tens of Gbps, every physical detail—from shielding methods to material of the medium, from impedance control to structural design—is determining whether the signal can be transmitted stably.
Among numerous solutions, micro coaxial cable stands out due to its precise structural control and excellent electrical performance, becoming an indispensable core component in modern high-speed interconnection.
I amSuzhou Huichengyuan ElectronicFocusing on the design and customization of high-speed signal cable harnesses and ultra-thin coaxial cable harnesses, providing customers with high-performance and reliable interconnection solutions. If you have related needs or would like to learn more, please contact:Manager Zhang 18913228573 (WeChat same number)。