A printed circuit board comprises a substrate and a routing structure arranged on the substrate, the substrate has a welding region and a routing region electrical connected with the welding region. The routing structure comprises a plurality of bonding pads connected with corresponding wires and a plurality of conductive traces electrically connected with the bonding pads, the bonding pads is arranged in the welding region, and the conductive traces are disposed in both the welding region and the routing region. The bonding pads are arranged abreast, and in the arrangement direction of the bonding pads, the bonding pads defines at least two grounding pads for connecting with grounding wires and at least a signal pad between the two grounding pads.

A shielded conductive path, including: a cylindrical shielding pipe that is in a state in which two semi-cylindrical members made of a metal material are joined together, and that is provided with a bend at a portion located in an axial direction; an electrical wire housed in the shielding pipe; a first weld that is provided only in a partial region of the shielding pipe that includes at least the bend in the axial direction, the first weld liquid-tightly joining the two semi-cylindrical members; and a second weld that is provided in all regions of the shielding pipe other than the first weld in the axial direction, the second weld liquid-tightly joining the two semi-cylindrical members, wherein a joining range of the second weld in a radial direction is narrower than a joining range of the first weld in the radial direction.

A flat data transmission cable includes a plurality of juxtaposed wires and a plastic layer enclosing on the wires integrally, each wire has a conductor. Central axes of the conductors are located on a same plane, and the plastic layer defines a top surface and a bottom surface parallel to the plane in which the central axes of the conductors located, the wires define at least two grounding wires and at least a signal wire between the two grounding wires.

A flat data transmission cable includes a plurality of juxtaposed wires, a plastic layer enclosing on the wires integrally and a metallic layer formed by a metal material belt arranged on an outer side of the plastic layer in a spiral winding way. In the length direction of the data transmission cable, the data transmission cable has at least one bending portion, the data transmission cable is formed with a first section and a second section on both sides of the bending portion, and a stable bending angle is formed between the first section and the second section.

A flat data transmission cable includes a plurality of juxtaposed wires, a plastic layer enclosing on the wires integrally and a metallic layer formed by a metal material belt arranged on an outer side of the plastic layer in a spiral winding way, each wire has a conductor. The metallic layer has at least an aluminum foil layer and a bonding layer arranged on the side of the aluminum foil layer facing to the plastic layer, the metallic layer is bonded to the outer side of the plastic layer by the bonding layer.

A flat data transmission cable includes a plurality of juxtaposed wires and a plastic layer enclosing on the wires integrally, each wire has a conductor. Central axes of the conductors are located on a same plane, and the plastic layer defines a top surface and a bottom surface parallel to the plane in which the central axes of the conductors located, the wires define at least two grounding wires and at least a signal wire between the two grounding wires.

A flat data transmission cable includes a plurality of juxtaposed wires, a plastic layer enclosing on the wires integrally and a metallic layer formed by a metal material belt arranged on an outer side of the plastic layer in a spiral winding way, each wire has a conductor. The metallic layer has at least an aluminum foil layer and a bonding layer arranged on the side of the aluminum foil layer facing to the plastic layer, the metallic layer is bonded to the outer side of the plastic layer by the bonding layer.

A flat data transmission cable includes a plurality of juxtaposed wires, a plastic layer enclosing on the wires integrally and a metallic layer formed by a metal material belt arranged on an outer side of the plastic layer in a spiral winding way. In the length direction of the data transmission cable, the data transmission cable has at least one bending portion, the data transmission cable is formed with a first section and a second section on both sides of the bending portion, and a stable bending angle is formed between the first section and the second section.

A printed circuit board comprises a substrate and a routing structure arranged on the substrate, the substrate has a welding region and a routing region electrical connected with the welding region. The routing structure comprises a plurality of bonding pads connected with corresponding wires and a plurality of conductive traces electrically connected with the bonding pads, the bonding pads is arranged in the welding region, and the conductive traces are disposed in both the welding region and the routing region. The bonding pads are arranged abreast, and in the arrangement direction of the bonding pads, the bonding pads defines at least two grounding pads for connecting with grounding wires and at least a signal pad between the two grounding pads.

A downhole cable includes a central core. The central core includes a metal tube having a plurality of optical fibers therein or a copper wire. The downhole cable further includes an extruded aluminum tube surrounding the central core.