What material is the shielding layer of the USB data cable made of?

The shielding layer of USB data cables is mainly made of non-magnetic materials such as copper and aluminum, usually braided copper mesh (aluminum magnesium braided mesh) or copper foil (aluminum foil, etc.), and its thickness is very thin, far less than the skin depth of the metal material at the frequency of use. It should be noted that one end must be connected to the circuit signal, because the shielding effect is mainly caused by the metal body itself not being on the electric field, but by the grounding of the shielding layer. Different grounding forms will directly affect the shielding effect.

The production process of USB data cable ordinary shielding wire is as follows:

Twisted copper - extruded (inner core) - wound wire (inner core wire) - wrapped with aluminum foil - woven (or wound) - extruded (outer)

In electronic connectors, letters are often used to indicate the use of materials, such as:

AL represents aluminum, such as 4C+AL, which means the packaging of aluminum wire with 4 wires.

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

S represents the winding, such as 4C+60/0.10S, which means 4C winding wire. The specification of the winding is copper wire with an outer diameter of 60 0.10mm.