High-Speed Signal Transmission: Comparison Analysis of FPC and Extra-Fine Coaxial Cable

In consumer electronics, smart hardware, and high-precision sensor systems, the choice of wiring directly affects the product's signal transmission performance and overall stability. The two common high-speed transmission solutions are FPC (Flexible Printed Circuit) and ultra-fine coaxial cable (micro coaxial cable). Both have their advantages, but in some high-demand scenarios, ultra-fine coaxial cable is usually a more reliable choice.

Difference in anti-interference ability
FPC is suitable for applications with limited space and flexible wiring, but its ability to resist electromagnetic interference is limited. When the system needs to transmit high-speed signals in complex electromagnetic environments, extremely thin coaxial cables with shielding structures can effectively reduce crosstalk and external noise interference. For example, in camera modules or wireless communication modules, the transmission of high-integrity signals often relies more on extremely thin coaxial cables.

Two, transmission bandwidth and signal integrity
With the improvement of resolution and data transmission rate, using FPC alone in long-distance or high-frequency applications often leads to signal attenuation. The controlled impedance and strong shielding performance of ultra-fine coaxial cables make high-speed differential signal transmission more stable, avoiding issues such as image jitter and delay. This is also the reason why ultra-fine coaxial cables are commonly used in AR/VR devices, notebook screens, and high-end medical imaging equipment.

Three, flexibility and mechanical reliability
The FPC structure is thin and flexible in wiring, but it is prone to fatigue and fracture in multiple bending or dynamic motion. In comparison, ultra-thin coaxial cables perform better in terms of mechanical reliability and are particularly suitable for dynamic motion parts, such as camera modules, folding screen hinges, and robotic joint sensor systems.

Four, typical application scenarios of ultra-fine coaxial lines
High-definition camera module (for smartphones, laptops, industrial cameras, etc.)
AR/VR display system
High-end medical imaging equipment
Aerospace and military electronics systems
Foldable or dynamically bendable equipment

Not all scenarios require the use of extremely thin coaxial cables. In cases of low-speed signals or extremely tight wiring spaces, FPC is still a cost-effective solution. However, under high-frequency, high-speed, strong interference environments, or dynamic bending requirements, extremely thin coaxial cables are usually the best choice.
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