A multi-layer metal core printed circuit board (MCPCB) has mounted on it at least one or more heat-generating LEDs and one or more devices configured to provide current to the one or more LEDs. The one or more devices may include a device that carries a steep slope voltage waveform. Since there is typically a very thin dielectric between the patterned copper layer and the metal substrate, the steep slope voltage waveform may produce a current in the metal substrate due to AC coupling via parasitic capacitance. This AC-coupled current may produce electromagnetic interference (EMI). To reduce the EMI, a local shielding area may be formed between the metal substrate and the device carrying the steep slope voltage waveform. The local shielding area may be conductive and may be electrically connected, to a DC voltage node adjacent to the one or more devices.

The power conversion device includes: a main circuit having first and second wiring layers formed respectively on both surfaces of a base board, mounted parts mounted on the first and second wiring layers, and first and second GND layers formed respectively, between external- and internal-layer portions of the base board and in regions corresponding to the mounted parts each being a mounted part which forms a circuit other than a circuit having an inductance component as a lumped constant, and to the first and second wiring layers; and a cooler attached to the base board by means of fixing screws through a first through-hole created in an end portion of the board; wherein the first and second GND layers are each formed so that creepage distance is created around a second through-hole in which a lead insertion part that mutually connects the first and second wiring layers is inserted.

A wiring substrate includes a first insulating layer with a first opening, a second insulating layer with a second opening, a high-frequency wiring layer, a first wiring layer, a second wiring layer, and a plurality of conductive pillars. The high-frequency wiring layer including a high-frequency trace is sandwiched between the first insulating layer and the second insulating layer. The first opening and the second opening expose two sides of the high-frequency trace respectively. The high-frequency trace has a smooth surface which is not covered by the first insulating layer and the second insulating layer and has the roughness ranging between 0.1 and 2 μm. The first insulating layer and the second insulating layer are all located between the first wiring layer and the second wiring layer. The conductive pillars are disposed in the second insulating layer and connected to the high-frequency trace.

The present disclosure provides a method of manufacturing a conductive pattern and applications thereof, the method including: a step of preparing a laminate including a transparent substrate, a light shielding pattern that is formed on the transparent substrate, and a negative tone photosensitive resin layer that is disposed on the transparent substrate and the light shielding pattern and is in contact with the transparent substrate; a step of irradiating a surface of the transparent substrate opposite to a surface facing the light shielding pattern with light; a step of developing the negative tone photosensitive resin layer to form a resin pattern in a region defined by the transparent substrate and the light shielding pattern; and a step of forming a conductive pattern on the light shielding pattern.

A method for manufacturing a circuit board structure with a waveguide is provided. The method includes: providing a first substrate unit, a second substrate unit, a third substrate unit, and two adhesive layers, the first substrate unit including a first dielectric layer and a first conductive layer, the first conductive layer including a first shielding area and two first artificial magnetic conductor areas disposed on two sides of the first shielding area; the second substrate unit including a second dielectric layer and a second conductive layer, the second conductive layer including a second shielding area; the third substrate unit defining a first slot, and the adhesive layer defining a second slot; stacking the first substrate unit, one of the adhesive layers, the third substrate unit, another one of the adhesive layers, and the second substrate unit in that order; pressing the intermediate body.

An electromagnetic wave transmission board proofed against internal signal leakage includes an inner plate, a first outer plate, a second outer plate, a first plate bump, a first conductive bump, a second plate bump, and a second conductive bump. The inner plate defines a first through hole with a plated metal layer on the hole wall. The first and second plated bumps are disposed between the first outer and inner plates. The second plate bump and the second conductive bump are disposed between the second outer plate and the inner plate. The plate metal layer, the first plate bump, the first conductive bump, the first outer plate, the second outer plate, the second conductive bump, and the second plated bump jointly form an air-filled chamber. A method for manufacturing the electromagnetic wave transmission board is also provided.

A circuit board with reduced dielectric losses enabling the movement of high frequency signals includes an inner circuit board and two outer circuit boards. The inner circuit board includes a first conductor layer and a first substrate layer. The first conductor layer includes a signal line and two ground lines on both sides of the signal line. The first substrate layer covers a side of the first conductor layer and defines first through holes which expose the signal line. Each outer circuit board includes a second substrate layer and a second conductor layer. The second substrate layer abuts the inner circuit board and defines second through holes which are not aligned with the first through holes, partially surrounding the signal line with air which has a very low dielectric constant. A method for manufacturing the high-frequency circuit board is also disclosed.

A wiring substrate includes a first insulating layer with a first opening, a second insulating layer with a second opening, a high-frequency wiring layer, a first wiring layer, a second wiring layer, and a plurality of conductive pillars. The high-frequency wiring layer including a high-frequency trace is sandwiched between the first insulating layer and the second insulating layer. The first opening and the second opening expose two sides of the high-frequency trace respectively. The high-frequency trace has a smooth surface which is not covered by the first insulating layer and the second insulating layer and has the roughness ranging between 0.1 and 2 μm. The first insulating layer and the second insulating layer are all located between the first wiring layer and the second wiring layer. The conductive pillars are disposed in the second insulating layer and connected to the high-frequency trace.

Technologies directed to coupling structures for antenna feeds of phased array antennas are described. One circuit board includes a first layer with a first portion of a RF coupling structure, a second layer with a second portion of the RF coupling structure, and a first insulation layer located between the first layer and the second layer. The RF coupling structure is configured to electromagnetically couple a first conductive trace on the first layer and a second conductive trace on the second layer at RF frequencies. The circuit board also includes an RF shielding structure coupled to a ground connection on the second layer and located in the first insulation layer. The RF shielding structure is configured to operate as a RF short circuit between the ground connection and a third conductive trace on the first layer at RF frequencies.

A PCB bridge for interconnection of two or more semiconductor chips for data communication between the semiconductor chips includes a plurality of metal strips; and a dielectric material disposed in between the plurality of metal strips. The PCB bridge is employed in a vertical direction in a semiconductor module for interconnection of two or more semiconductor chips, the vertical direction of the PCB bridge provides a flexible impedance matching by adjusting the dielectric material and a trace width of the PCB bridge, and the vertical direction of the PCB bridge avoids signal reflections by matching the impedance to a source, and a trace length of the PCB bridge is limited by spacing in between two semiconductor chips which further limited inductance of the trace of the PCB bridge.