In the field of modern high-frequency signal transmission, ultra-thin coaxial cables (micro coaxial cable) are widely used in scenarios such as smartphones, laptops, automotive systems, and medical imaging equipment due to their excellent signal integrity and miniaturization advantages. With the continuous increase in transmission frequency, high-frequency loss has become a problem that engineers must focus on when designing.
The main sources of high-frequency losses in extremely fine coaxial beam
In high-frequency transmission, signal loss is mainly affected by the following factors:
• Dielectric Loss: The dielectric constant and the tangent of the loss angle of the cable insulation material determine the magnitude of the dielectric loss, and the higher the frequency, the more obvious the loss.
• Conductor Loss: High-frequency signals tend to conduct on the surface of conductors, and surface roughness and material directly affect the loss.
Connector contact impedance: The quality of the connector's connection affects the impedance matching of the entire link. If there is impedance discontinuity, it will lead to increased return loss and reduced signal integrity.
The key to high-frequency loss control: high-quality connectors
In addition to the selection of the cables themselves, the connector performance is crucial for the high-frequency characteristics of the entire ultra-thin coaxial cable assembly. Taking KEL USLS20-30 as an example:
Super compact high-density design: pitch only 0.4mm, capable of fitting coaxial cables with an outer diameter of 0.3mm, suitable for laptop computers, medical imaging and portable devices, etc., that have strict requirements for high-frequency signal integrity.
Excellent impedance control: effectively reduce signal reflection and ensure stable transmission of high-frequency signals.
Excellent reliability: over 30 insertion and removal cycles, with good contact reliability and shock resistance.
Three, current status of market substitutes
Currently, there are domestic male and female connectors as alternatives for USLS20-30 on the market. Some domestic brands have launched compatible models with more competitive prices, suitable for cost-sensitive projects. After long-term development, these alternatives have already approached or can match the original factory products in terms of high-frequency characteristics, reliability, and long-term stability.
Recommendations for High-Frequency Applications of Extra-Fine Coaxial Cable Assemblies
Prefer low-loss medium materials such as FEP or ePTFE insulation layers.
Connectors use high-performance products with good impedance consistency, such as the KEL USLS20-30 series.
Control the welding process to ensure that the contact resistance is less than 50mΩ and the impedance deviation is controlled within ±10%.
Ensure the cable port is properly shielded against EMI to reduce high-frequency interference.
In high-frequency signal transmission, controlling the loss of extremely thin coaxial cables is crucial, and high-quality connectors are the core of ensuring signal stability. With excellent impedance matching and reliability, KEL USLS20-30 becomes an ideal partner for extremely thin coaxial cables.
We have long been focused on the design and customization of high-speed cable harnesses and ultra-thin coaxial cables, committed to providing stable and reliable high-speed interconnection solutions. If you have any related needs or want to learn more, please contact: Manager Yin.
18913280527（WeChat same number）。
