Why is ultra-fine coaxial cable the preferred choice for high-speed applications?

7 月 11, 2023 CABLE

1.Characteristics and Applications of Ultra-fine Coaxial Cable

With the increasing use of high-speed internet and high-capacity storage devices, it has become easier for us to enjoy high-quality images and videos on consumer products such as personal computers, tablets, and smartphones. The amount of information that needs to be processed in these devices has dramatically increased, and the signal speeds (transmission standards) within the devices are becoming faster.

Cables and FPC/FFC (Flexible Printed Circuit/Flexible Flat Cable) are primarily used as jumper connections for signal and power transmission between module boards in devices. The choice between cables and FPC/FFC is determined to some extent by the signal speed (signal transmission standards) and transmission distance.
The above-mentioned coaxial cables include ultra-thin coaxial cables and twin-core cables.

With the increasing signal transmission speed in recent years, the application of ultra-thin coaxial cables in jumper devices has become increasingly widespread.

2.The signal transmission advantages of ultra-thin coaxial cables.

The signal transmission characteristics are influenced by several parameters, including impedance, insertion loss, return loss, and crosstalk. Here are some key reasons why ultra-thin coaxial cables are generally considered to have signal transmission advantages in high-speed signal transmission.

2.1Reduce return loss: The center conductor, insulation material, and outer conductor of ultra-thin coaxial cables are properly matched, resulting in stable performance at a specific impedance. The matched and stable impedance results in low return loss.

2.2Reduce insertion loss: Compared to FPC/FFC, ultra-thin coaxial cables can ensure a larger cross-sectional area of the center conductor when matching a specific impedance, thereby minimizing insertion loss to the maximum extent possible.

2.3Improve shielding performance: The outer conductor plays a role in electromagnetic shielding, thereby reducing the susceptibility of the electrical signals transmitted through the center conductor to external electromagnetic waves (electromagnetic noise). Additionally, the shielding effect of the outer conductor helps reduce crosstalk between signals.

3.Mechanical advantages of ultra-fine coaxial cables.

The reason for commonly using ultra-fine coaxial cables is their higher flexibility compared to shielded FPC/FFC, allowing them to maintain stable electrical characteristics even when bent.

Flexible ultra-fine coaxial cables are suitable for devices with rotating shafts where cables need to be routed within the device, such as in laptops, tablet hinges, and moving cameras on drones. With the increasing demand for applications including high-definition cameras and displays, along with faster signal transmission speeds, ultra-fine coaxial cables that combine high-speed signal characteristics with mechanical advantages have become the preferred solution.

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