The present invention relates to the technical field of underwater communications, and discloses a bridging transmission device for underwater wireless signals, which includes a coaxial cable and two conversion assemblies. The coaxial cable can transmit the weak electric signal. The transmission device transmits and converts wireless signals by means of signal bridging between two or among more independent intelligent terminal devices, converts the electromagnetic wave signal and the weak electric signal to each other through two groups of conversion antennas, and transmits the weak electric signal under water through the coaxial cable, so the purpose of the remote transmission of underwater wireless signals can be achieved. The conversion assembly has no need to be wired to the intelligent terminal device through an interface, so the waterproof performance is good, and the universality is high.

A cable includes an inner conductor and a dielectric layer extending around the inner conductor. The dielectric layer includes a linearly-stretched polypropylene film having a porous structure that includes a plurality of pores that extend through a thickness of the linearly-stretched polypropylene film. The dielectric layer includes air molecules trapped within the pores of the linearly-stretched polypropylene film such that the dielectric layer includes polypropylene and air. The cable includes an outer conductor extending around the dielectric layer.

An Ethernet cable that includes a pair of cores including a single-wire conductor and an insulator covering the single-wire conductor; and an armoring layer entirely covering the pair of cores, wherein the pair of cores are twisted together to have a twist pitch (P1) in a cable length direction satisfying certain characteristics.

A transmission line includes a conductor for signal transmission and an isolating layer covering the conductor. The isolating layer includes a first isolating strand group and a second isolating strand group. The first isolating strand group is wound in a way that forms an S-twist around the conductor along an axis direction the conductor, and the second isolating strand group is wound in a way that forms a Z-twist around the conductor along the axis direction. In an interval from a first position to a second position, including the first position, the first isolating strand group continuously overlaps an outside of the second isolating strand group, and in an interval from the second position to a third position, including the second position, the second isolating strand group continuously overlaps an outside of the first isolating strand group.

A coaxial isolator includes an integrated circuit board, a first body and a second body. The integrated circuit board includes a first surface, a second surface, a signal processing circuit extending along a central axis, two first capacitors, two second capacitors, and a first iron core. The first capacitors are located on the first surface and are respectively disposed on both sides of the signal processing circuit. The second capacitors are located on the second surface and are respectively arranged corresponding to the positions of the first capacitors. The first iron core surrounds the signal processing circuit. A first tube portion of the first body surrounds the integrated circuit board, and a first end portion of the first body is used for connecting with an external device. A second end portion of the second body is used for connecting with another external device.

Medical devices that include a medical tool, a handle and a flexible cable bundle passing through the handle. The handles and cable routing therethrough are adapted to reduce noise within the cable.

A differential mode instrumentation cable for improving the signal integrity of audio signals in different environments including use of microphones, speaker cable, audiophile cables and analog audio balanced/differential tie lines comprising a first triaxial cable and a second triaxial cable placed side-by-side and mounted together, said first coaxial cable and said second coaxial cable including a wired connection that includes an active driven shield buffer circuit in each triaxial cable having an inner conductor for voltage in from the positive polarity and minus polarity and the voltage out driven guard shield with series breakout resistor connected to the each triaxial inner shield.

A cable includes a conductor, an insulator surrounding the center conductor, and a shield surrounding the insulator, wherein the shield has two foil layers and two braid layers. Each foil layer includes two foil surfaces, each braid layer includes two braid surfaces, and only one of the foil surfaces of the two foil layers confronts only one of the braid surfaces of the two braid layers.

A plug-in device is provided for adapting a building's electrical wiring system as an antenna for receiving radio or over-the air television signals. The device has a plug for insertion into an electrical receptacle in the building, a coaxial connector for providing the communication signal captured by the antenna to a signal receiver, and a plurality of conducting wires extending from the plug to the coaxial connector. The conducting wires comprise first and second wires, and a third wire in electrical contact with the coaxial connector. The first and second wires are electrically insulated from each other and from the third wire to prevent passage of alternating current (AC) power to the signal receiver. The wires are wound to inductively transfer the communication signal captured by the antenna to the third wire for output to the signal receiver via the coaxial connector.

A high-frequency coaxial attenuator includes a first coaxial cable portion that includes a first center conductor having a first length, and a first insulator of the first length formed around the first center conductor, wherein the first center conductor and the first insulator form a first diameter. A second coaxial cable portion is separated from the first coaxial cable portion by a gap. The second coaxial cable portion includes a second center conductor having a second length, and a second insulator of the second length formed around the second center conductor. A semiconductor material is deposited in the gap between the first coaxial cable portion and the second coaxial cable portion. The semiconductor material may be configured to provide an impedance of 500Ω and provides 20 dB of attenuation, and a 10:1 voltage divider based on a 50Ω input impedance of test equipment.