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Is Your Mobile Data Cable Shielded And Braided?
May 25, 2018

    Data lines can be divided into three types: medium, high, and low end. Different types of data lines used in the raw materials used are not the same, the price is relatively high, the high-end certainly is much more expensive than the low-end. Not only is the selection of raw materials different, the data lines in the high-end and mid-range are also more complex and cumbersome than the processing lines in the low-end data lines, and the protection of the middle and high-end data lines is also shielded and woven. We can see that the high-end data line is usually composed of several parts: plastic shell - woven mesh - aluminum foil - copper core. The conductor core (copper core) surrounded by a colored insulator in the innermost layer is used to transmit data signals and current, and the outer shell is used to protect the wires. What is the role of the intermediate braided and aluminum foil layers?

      One important role of the data line is to transmit data signals. However, we may have all kinds of messy interference information around us. Let us consider if these interference signals enter the inner conductor of the data line and add it to the originally transmitted signal. Is it possible to disturb or change the originally transmitted signal, resulting in useful signal loss or problems?

Data lines have two layers of shielding

      These woven and aluminum foil layers act as guards and shields against the information we transmit. Of course not all data lines have two layers of shielding, some have multiple layers of shielding, some have only one layer, or even none. Shielding is the isolation of metal between two spatial regions to control the induction and radiation of electric, magnetic and electromagnetic waves from one region to another. Specifically, the conductor cores are surrounded by shields to prevent them from being affected by external electromagnetic fields/disturbing signals, and at the same time, to prevent the electromagnetic interference/signal from spreading out in the lines.

      The shielding layer of the data cable is mainly made of non-magnetic materials such as copper and aluminum. Generally, the braided copper mesh (aluminum-magnesium braided mesh) or copper anchor (aluminum porosimeter) is used. Their thickness is very thin and much smaller than the frequency of use of metal materials. Skin depth. The point to be explained is that one end of it must be connected to the signal ground of the circuit, because the effect of the shielding layer is not mainly due to the reflection and absorption of the electric field and magnetic field by the metal body itself, but is caused by the grounding of the shielding layer, and the grounding is Different forms will directly affect the shielding effect.

The production process of common shielded wire rods is as follows:

Stranded Copper - Extruded (Inner Core) - Winding (Inner Core) - Alpaca - Braided (or Wrapped) - Extruded (Outside) - Roll Packaging

In electronic links, we often use letters to identify the materials used, such as:

AL stands for aluminum mooring, such as: 4C + AL, which means four-core wire wrapped aluminum.

AB stands for weaving, such as: 4C+80/0.10AB, which means a 4-core braided wire. The braided specification is 80 copper wires with an outer diameter of 0.10 mm.

S stands for winding, such as: 4C+60/0.10S, which means 4C winding wire, and the winding specifications are 60 0.10mm outer diameter copper wires.