From structure to anti-interference: How ultra-fine coaxial cable束 assists high-speed equipment in passing EMC tests

In high-speed, miniaturized electronic devices, extremely fine coaxial cable束（Micro Coaxial Cable）is a critical signal transmission medium. It not only supports high-frequency, high-speed data transmission, but is also closely related to the EMI/EMC (electromagnetic interference and electromagnetic compatibility) test results of the equipment. Below, we will analyze its important role in high-speed electronic systems from aspects such as structural characteristics, test performance, and design challenges.

The unique structure of the ultra-fine coaxial beam
Very fine coaxial cables are usually composed of a central conductor, insulating layer, metallic shielding layer, and an external sheath. Although their size is much smaller than that of traditional coaxial cables, they still possess excellent impedance consistency and signal transmission performance. The application of the shielding layer particularly excels in resisting external electromagnetic interference and reducing self-radiation. This "double-layer protection" structure allows very fine coaxial cables to achieve higher reliability and stability in EMI/EMC testing compared to ordinary parallel wires.
Advantages of ultra-fine coaxial cables in EMI/EMC testing
(1) Suppress electromagnetic emission: In the transmission test, extremely thin coaxial cables can effectively reduce the leakage of high-frequency signals, avoid the cable acting as an "antenna," thereby reducing the risk of exceeding the electromagnetic radiation standard.
(2) Enhanced anti-interference capability: In the interference resistance test, the shielding layer can resist external electromagnetic noise and maintain the stability of internal signals, which is especially crucial for high-speed interfaces and radio frequency modules.
(3) Maintain signal integrity: Under GHz-level high-frequency transmission, the extremely thin coaxial cable bundle has low loss and precise impedance control, which can effectively maintain the clarity of the signal waveform, reduce reflection and distortion.

Challenges in Design and Application
Although extremely thin coaxial cable束 has excellent electromagnetic compatibility performance, it may also become a hidden danger of EMC problems if not designed properly:
(1) Shielding discontinuity: If the connector terminal or grounding design is poor, the shielding layer may appear "break points", causing interference leakage.
Insufficient mechanical reliability: The wire material is soft and the diameter is small. If it is frequently bent or subjected to improper force, it is prone to damage the shielding layer, which affects the EMI/EMC test results.
(3) Poor impedance matching: If there is impedance mismatch between the harness and the PCB or connector, it will cause signal reflection and increase the risk of radiation.
Therefore, in the product design and selection stage, it is necessary to simultaneously consider factors such as shielding grounding methods, impedance matching, and structural protection in order to fully utilize its electromagnetic compatibility performance.

Typical Application Scenarios
Extremely thin coaxial cable束 is widely used in mobile phone camera modules, notebook screens, AR/VR devices, drones, and high-speed data interfaces. These products generally have the characteristics of compact structure and high signal rate, and the micro coaxial cable, with its miniaturization and high shielding efficiency, allows the devices to maintain excellent electromagnetic compatibility performance in limited spaces and pass the tests smoothly.

Overall, ultra-fine coaxial cable束, with its exquisite structure, efficient shielding performance, and stable high-frequency characteristics, provides a reliable support for EMI/EMC compliance of modern electronic devices. However, it is not a "one-size-fits-all" solution—it still requires careful consideration of materials, connections, wiring, and testing coordination during the design phase to achieve electromagnetic compatibility optimization at the system level.
We are[Suzhou Huichengyuan Electronic], focused on the design and customization of high-speed cable harnesses and extremely thin coaxial cables, committed to providing customers with high-quality high-speed interconnect solutions. If you have any related needs or wish to learn more, please feel free to contact:Manager Zhang 18913228573 (same as WeChat)。