Extremely fine coaxial cables (Micro Coaxial Cable) are widely used in fields such as smartphones, tablets, high-definition cameras, automotive electronics, and 5G communication equipment due to their slender structure and excellent high-frequency transmission performance. They excel in high-density wiring and fine signal transmission scenarios, but the influence of cable length on signal quality is also an important factor that must be paid attention to.
What is a Micro Coaxial Cable?
Micro coaxial cable is a type of coaxial cable with an extremely small diameter and precise structure, usually with a diameter between 0.25mm and 1mm. It consists of a thin central conductor, insulating medium, woven or foil shielding layer, and an external protective layer. Compared with ordinary coaxial cables, micro coaxial cables are more suitable for applications with limited space and a need for high-bandwidth signal transmission.
The specific effect of the length of ultra-fine coaxial cables on the signal
Signal Attenuation
Due to the small cross-sectional area of micro coaxial cables and relatively large conductor resistance, the signal attenuation becomes significant when the length increases. In the frequency range of a few hundred MHz to GHz, even slightly longer cables can cause a significant decrease in signal energy.
Propagation Delay
The transmission speed of signals is affected by the dielectric constant of the cable material. The longer the cable, the greater the propagation delay. For high-speed digital signals, the delay difference may cause data synchronization issues.
Impedance and Reflection
The standard impedance of Micro Coax is generally 50 ohms. The change in cable length may affect the impedance matching at the terminal, and too long can lead to signal reflection and waveform distortion.
Crosstalk and Noise
Although shielding layers can effectively reduce interference, longer cables are more susceptible to external electromagnetic influence, thereby increasing crosstalk.
Application Suggestions for Different Lengths of Ultra-Fine Coaxial Cables
Phone camera module: The length of Micro Coax cable is generally controlled within a few centimeters to ensure clear and stable image signal.
5G RF link: cable length is strictly limited to avoid signal power loss and ensure high-speed data transmission.
Car Electronics: In the limited space inside a car, Micro Coax is used for radar or sensor signal connections, and the length design directly affects detection accuracy.
Micro coaxial cable serves as an important medium for high-frequency and high-speed signal transmission, and its length significantly affects signal quality, especially in the GHz frequency band. Longer cables may cause noticeable attenuation and delay. Reasonably controlling the cable length, selecting high-performance materials, and optimizing impedance matching are crucial for ensuring stable and reliable signal transmission.
We have been focusing on the design and customization of high-speed cable harnesses and ultra-fine coaxial cable harnesses for a long time, committed to providing stable and reliable high-speed interconnection solutions. If you have any related needs or want to learn more, please contact: Manager Zhang.
18913228573（WeChat same number）.
