A circuit board includes a first external circuit layer, a first substrate, a second substrate, a third substrate, and a conductive through hole structure. The first substrate includes conductive pillars electrically connecting the first external circuit layer and the second substrate. The second substrate has an opening and includes a first dielectric layer. The opening penetrates the second substrate, and the first dielectric layer fills the opening. The third substrate includes an insulating layer, a second external circuit layer, and conductive holes. A conductive material layer of the conductive through hole structure covers an inner wall of a through hole and electrically connects the first and the second external circuit layers to define a signal path. The first external circuit layer, the conductive pillars, the second substrate, the conductive holes and the second external circuit layer are electrically connected to define a ground path surrounding the signal path.

The present disclosure is directed to a hybrid dielectric interconnect stack for a printed circuit board having a first dielectric layer with a first dielectric constant and a first dielectric loss tangent positioned over an intermediate layer, which includes a first dielectric sublayer with a first sublayer dielectric constant and a first sublayer dielectric loss tangent, an embedded conductive layer, and a second dielectric sublayer with a second sublayer dielectric constant and a second sublayer dielectric loss tangent, in which the embedded conductive layer is positioned between the first and second dielectric sublayers, and a second dielectric layer with a second dielectric constant and a second dielectric loss tangent, in which the intermediate layer is positioned between the first and second dielectric layers.

A circuit board with high light reflectivity includes an inner wiring base board, a base board with a high light reflectivity, a first insulation layer, a first conductor layer, and a second insulation layer. A first opening in the inner wiring base board receives the base board. The first insulation layer is stacked on a surface of the inner wiring base board and defines a second opening corresponding in position to the first opening and exposing a portion of the base board. The first conductor layer is on a surface of the first insulation layer away from the inner wiring base board and includes connecting pads on the base board. The second insulation layer and the second conductor are stacked in that order on another surface of the inner wiring base board. A method for manufacturing the circuit board is also disclosed.

Provided are a circuit board, an apparatus and a method for forming a via hole structure. A via hole structure formed on a main body (10) of a circuit board includes a hole (12) enclosed by a conductive layer in the main body (10), the conductive layer constitutes a wall (11) of the hole (12), and a dielectric filling layer (13), which has a dielectric constant smaller than that of the main body (10), is disposed between at least a portion of the wall (11) of the hole (12) and the main body (10), so that the parasitic capacitance of a via hole is decreased, and the impedance of the via hole is increased to become closer to the impedance of a transmission line, thereby effectively improving impedance continuity of a system link.

An inductor built-in substrate includes a core substrate having an opening and a first through hole formed therein, a magnetic resin filling the opening formed in the core substrate such that the magnetic resin has second through holes formed therein, a first through-hole conductor formed in the first through hole of the core substrate and including a metal film formed in the first through hole of the core substrate, and second through-hole conductors formed in the second through holes of the magnetic resin and including metal films formed in the second through holes of the magnetic resin, respectively.

A package substrate has a dielectric layer and a redistribution metal layer. The dielectric layer has a first dielectric material and a second dielectric material. The first dielectric material is different than the second dielectric material. The second dielectric material may have a dielectric constant that is either greater than or less than the dielectric constant of the first dielectric material. The second dielectric may be selected based on a specific target application such as single-ended signal routing or serializer/deserializer (SERDES) routing.

A printed circuit board (PCB), comprising a first layer, the first layer comprising a first dielectric material substantially exclusively. The PCB also comprises a second layer, the second layer comprising the first dielectric material within a first region and a second dielectric material within a second region adjacent to first region. The first dielectric material has a first dielectric constant, a first coefficient of thermal expansion (CTE) and a first glass transition temperature (Tg). The second dielectric material has a second dielectric constant, a second CTE and a second Tg. The first dielectric constant is greater than the second dielectric constant. The first CTE is substantially equal to the second CTE; and the first Tg and the second Tg are greater than 150° C.

An ear-worn electronic device is configured to be worn by a wearer and comprises a housing configured to be supported at, by, in or on the wearer's ear. A processor is disposed in the housing. A speaker or a receiver is operably coupled to the processor. A radio frequency transceiver is disposed in the housing and operably coupled to the processor. An antenna is disposed on or in the housing and operably coupled to the transceiver. The antenna comprises a radiating element, a ground plane, and a substrate disposed between the radiating element and the ground plane. The substrate comprises one or both of a dielectric gel and a dielectric liquid.

Various circuit boards and methods of fabricating and using the same are disclosed. In one aspect, a circuit board is provided that has a substrate with a pocket and a conductor layer. A chiplet is positioned in the pocket. The chiplet has plural bottom side interconnects electrically connected to the conductor layer and plural top side interconnects adapted to interconnect with two or more semiconductor chips.

A circuit board includes a first dielectric material, a second dielectric material, a third dielectric material, a first external circuit layer, a second external circuit layer, multiple conductive structures, and a conductive via structure. Dielectric constants of the first, the second and the third dielectric materials are different. The first and the second external circuit layers are respectively disposed on the first and the third dielectric materials. The conductive via structure at least penetrates the first and the second dielectric materials and is electrically connected to the first and the second external circuit layers to define a signal path. The conductive structures are electrically connected to each other and surround the first, the second and the third dielectric materials. The conductive structures are electrically connected to the first and the second external circuit layers to define a ground path surrounding the signal path.