A high-speed transmission line includes a first shielded layer, a first insulating layer, a conductor layer, a second insulating layer and a second shielded layer sequentially attached to each other. The conductor layer includes plural first conductors and plural first conductors interspersed with each other, and the first conductor has a round cross section and is made of a round copper wire capable of increasing the signal transmission speed and extending the scope of application of the transmission line of a flexible cable.

A coaxial cable includes a conductor, an electrically insulating member provided over a periphery of the conductor, a shielding layer composed of served shields formed by helically wrapping a plurality of metal wires around the electrically insulating member, and a sheath provided around the shielding layer. The electrically insulating member includes indentations on portions of its surface to be brought into contact with and mated to the metal wires respectively. The shielding layer includes portions in respective circumferential directions of the plurality of metal wires being brought into contact with the electrically insulating member are mated to the indentations, respectively, on the electrically insulating member, and adjacent ones of the metal wires in a circumferential direction of the shielding layer are in surface contact with each other.

Provided are flexible hybrid interconnect circuits and methods of forming thereof. A flexible hybrid interconnect circuit comprises multiple conductive layers, stacked and spaced apart along the thickness of the circuit. Each conductive layer comprises one or more conductive elements, one of which is operable as a high frequency (HF) signal line. Other conductive elements, in the same and other conductive layers, form an electromagnetic shield around the HF signal line. Some conductive elements in the same circuit are used for electrical power transmission. All conductive elements are supported by one or more inner dielectric layers and enclosed by outer dielectric layers. The overall stack is thin and flexible and may be conformally attached to a non-planar surface. Each conductive layer may be formed by patterning the same metallic sheet. Multiple pattern sheets are laminated together with inner and outer dielectric layers to form a flexible hybrid interconnect circuit.

The flat cable 10 has at one end or both ends a connector section 11 on which a connector conductor 15 electrically connectable to a ground layer of an electronic circuit board is formed. Signal conductors 12, 13 are covered by a protective shield layer 20 having a metal layer on the inside and an insulating plastic layer on the outside. The metal layer of the protective shield layer is electrically connected to the connector conductor 15 of the connector section, and a portion 17a of the metal layer of the protective shield layer is exposed to the outside of the protective shield layer 20 and functions as a ground layer.

A shielded electrical cable includes conductor sets extending along a length of the cable and spaced apart from each other along a width of the cable. First and second shielding films are disposed on opposite sides of the cable and include cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the films in combination substantially surround each conductor set. An adhesive layer bonds the shielding films together in the pinched portions of the cable. A transverse bending of the cable at a cable location of no more than 180 degrees over an inner radius of at most 2 mm causes a cable impedance of the selected insulated conductor proximate the cable location to vary by no more than 2 percent from an initial cable impedance measured at the cable location in an unbent configuration.

A wiring member includes a wiring body and a pattern, the wiring body includes a plurality of wire-like transmission members and a base material, the plurality of wire-like transmission members are fixed to the base material in an aligned state, and the pattern is provided on the wiring body, and makes a two-dimensional position of at least a part of a portion related to the base material recognizable in the wiring body.

A wiring member includes: a plurality of wire-like transmission members; a sheet to which the plurality of wire-like transmission members are fixed to be arranged side by side; and a level difference absorption member provided on an outer side of the sheet, wherein the sheet includes a first sheet covering the plurality of wire-like transmission members from one side and a second sheet covering the plurality of wire-like transmission members from another side, the level difference absorption member is provided on an outer side of the second sheet, and the level difference absorption member is provided to be able to absorb a level difference caused by a level difference formed on an outer surface of the second sheet when an outer surface side of the level difference absorption member is vacuum-sucked.

A wiring member includes: a flat wiring body including a plurality of wire-like transmission members, and a base member that holds the plurality of wire-like transmission members to be flat; and a pattern provided on the flat wiring body, and making a three-dimensional posture of the flat wiring body recognizable.

A shielded electrical cable includes conductor sets extending along a length of the cable and spaced apart from each other along a width of the cable. First and second shielding films are disposed on opposite sides of the cable and include cover portions and pinched portions arranged such that, in transverse cross section, the cover portions of the films in combination substantially surround each conductor set. An adhesive layer bonds the shielding films together in the pinched portions of the cable. A transverse bending of the cable at a cable location of no more than 180 degrees over an inner radius of at most 2 mm causes a cable impedance of the selected insulated conductor proximate the cable location to vary by no more than 2 percent from an initial cable impedance measured at the cable location in an unbent configuration.

Provided are a flexible flat cable and a method of producing the same. The flexible flat cable includes a plate-shaped first insulation portion comprising an insulating material; a first ground, a second ground, and a third ground disposed at predetermined intervals on the first insulation portion; at least one first signal transmission line positioned between the first ground and the second ground and disposed on the first insulation portion; at least one second signal transmission line positioned between the second ground and the third ground and disposed on the first insulation portion; a first second insulation portion disposed on at least a portion of the first ground and at least a portion of the at least one first signal transmission line and the second ground; a second second insulation portion disposed on at least a portion of the second ground and at least a portion of the at least one second signal transmission line, and the third ground; a conductive adhesive layer configured to enclose the first insulation portion, the first second insulation portion, and the second second insulation portion; and a shielding portion comprising a shielding material adhered to an outside of the conductive adhesive layer. Therefore, by improving shielding efficiency of a plurality of signal transmission lines, while having good electromagnetic interference and crosstalk characteristics, a plurality of signals can be simultaneously transmitted.