A circuit pattern of a power line and a circuit pattern of a signal line are disposed in a first layer of a laminated circuit board device, a circuit pattern of the signal line to be protected is disposed in a second layer, and a circuit pattern of a power line is disposed in a third layer. The shapes of the first circuit pattern of the power line of the first layer and the second circuit pattern of the power line of the third layer are substantially matched with each other with respect to a portion of the second layer lacing the circuit pattern of the signal line. The direction of the current of the first circuit pattern coincides with the direction of the current of the second circuit pattern.

A transmission line includes first, second, third, and fourth signal lines, and first, second, third, and fourth electrode pads respectively connected thereto. A first main surface of an external connection portion includes a first region in which the first electrode pad and the second electrode pad are provided, and a second region in which the third electrode pad and the fourth electrode pad are provided. Each of the first electrode pad and the second electrode pad, in a plan view, is surrounded by a ground electrode, and at least one of the third electrode pad and the fourth electrode pad, in the plan view, includes a portion that is not surrounded by the ground electrode.

An optical module, including: a first laser and a first laser chip for driving the first laser; a second laser and a second laser chip for driving the second laser; and a multi-layer circuit board, including a surface layer, a reference layer, and an intermediate layer provided between the surface layer and the reference layer, where a first row of edge connector pins and a second row of edge connector pins are disposed in at least one surface layer; the first row of edge connector pins are disposed to be closer than the second row of edge connector pins to a side edge, of the multi-layer circuit board, that is provided with an edge connector; and a region, of the intermediate layer, that corresponds to a data signal line pin in the second row of edge connector pins is a hollow region.

The electronic circuit device includes: a first wiring pattern which is formed on a first main surface of a circuit board, has circuit elements including a switching element and mounted along a predetermined direction, and includes a virtual shortest current path connecting the circuit elements to each other along the predetermined direction; a second wiring pattern which is formed on a second main surface, and includes an opposing current path that opposes an area where the virtual shortest current path is formed; vias electrically connecting the first and second wiring patterns; and vias for heat transfer, connecting a mount area for the switching elements on the first main surface with an area on a side of the opposing current path on the second main surface. The heat dissipation member is in contact with the second main surface.

An electronic device includes a first substrate having a first bonding region, a first circuit, a second circuit, a third circuit, and a plurality of first conductive contacts. The first and second circuit are located at a first edge and a second edge of the first bonding region, the third circuit is located between the first and the second circuits. A second substrate having a second bonding region corresponding to the first bonding region in position and a fourth circuit, a fifth circuit, a sixth circuit, and a plurality of second conductive contacts. When the first substrate is bonded with the second substrate, the first circuit, the second circuit, the third circuit, the fourth circuit, the fifth circuit, and the sixth circuit form a loop, and the first and second conductive contacts are electrically connected to a plurality of signal circuits.

A printed circuit board according to various embodiments of the present disclosure can include a first substrate layer, a dielectric layer stacked below the first substrate layer, and a second substrate layer stacked below the dielectric layer. The second substrate layer can include: a power line; a ground part disposed to have an isolated area along the power line; and a ground line which extends from the ground part so as to be disposed in the isolated area, and which separates the isolated area into a first area and a second area so as to generate electromagnetic waves for canceling the electromagnetic waves generated by a current flowing through the power line. Other embodiments are also possible.

A printed circuit board that includes a base layer having a first surface and a second surface opposing each other. A first structure is disposed on the first surface of the base layer. The first structure includes a first plate structure. A first connection structure is disposed on a same plane as the first plate structure and is spaced apart from the first plate structure. The first plate structure includes first openings. At least some of the first openings are linear openings having a line shape.

An electrical connector includes a substrate that includes a plurality of ground traces at first and second surfaces of the substrate, and a ground coupling assembly that couples pairs of ground traces at each of the first and second surfaces, and further couples the ground traces at the first surface to the ground traces at the second surface.

Disclosed herein is a circuit board that includes a substrate and a coil component mounted on the substrate. The coil component includes a core and a wire wound around the core. The substrate includes a dielectric and a capacitive electrode capacitively coupled to the wire through the dielectric and supplied with a ground potential.

A transmission line member includes a base body extending along a transmission direction of a high-frequency signal, and a first transmission line, a second transmission line, and a third transmission line. The base body includes a first portion including the first transmission line, a second portion including the second transmission line, and a third portion including the third transmission line. The second portion is connected between the first and third portions. A thickness of the second portion is smaller than a thickness of the first and third portions. The second transmission line includes only a conductor pattern extending more in the transmission direction than in a direction of the thickness.