Abstract:
A printed circuit board and a design method thereof are disclosed. The design method includes: wiring signal lines on an area basis at inner layers adjacent to outer surface layers; arranging the outer surface layers with no wiring or few wirings and interconnecting the outer surface layers through through vias, so that the outer surface layers function as a primary ground; and setting parameters of a line width and a layer height to control a target impedance value. The printed circuit board includes outer surface layers and two inner layers therebetween. The inner layers adjacent to the outer surface layers are used for arranging signal lines on an area basis; and the outer surface layers are arranged with no wiring or few wirings and are interconnected as a primary ground through through vias. The invention also discloses a mainboard of a terminal product using the printed circuit board.
Abstract:
An organic multilayer wiring circuit board comprises: a signal layer (L4); a first insulating layer (24) made of resin and arranged on the signal layer (L4); a lamination body arranged on the first insulating layer (24), which lamination body includes: an electric power source layer (L3); a ground layer (L2); and a second insulating layer (16) made of polyimide and provided between the electric power source layer (L3) and the ground layer (L2); the second insulating layer (16) having a thickness of 4 to 25µm and a thermoplastic adhesive property on both faces thereof; a third insulating layer (14) made of resin and arranged on the lamination body; and an uppermost conductive layer (L1) arranged on the third insulating layer (14), on which an electronic component is to be mounted.
Abstract:
A tile subarray includes an upper multi-layer assembly (UMLA) provided from a first plurality of printed circuit boards and a lower multi-layer assembly (LMLA) provided from a second plurality of printed circuit boards. Each of the UMLA and LMLA includes one or more radio frequency (RF) interconnects between different circuit layers on different circuit boards which make up the UMLA and LMLA. The RF interconnects can include one or more RF matching pads which provide a mechanism for matching impedance characteristics of RF stubs to provide the RF interconnects having desired insertion loss and impedance characteristics over a desired RF operating frequency band. The RF matching pads allow the manufacture of circuit boards having RF interconnects without the need to perform any back drill and back fill operation to remove stub portions of the RF interconnects in the UMLA and LMLA.
Abstract:
A method of making a multilayered circuitized substrate (101) in which a continuous process is used to form electrically conductive layers (65) which each will form part of a sub-composite (75, 75', 75"). The sub-composites (75, 75', 75") are then aligned such that openings (57) within the conductive layers (65) are also aligned, the sub-composites (75, 75', 75") are then bonded together, and a plurality of holes (113) are then laser drilled through the entire thickness of the bonded structure. The dielectric layers (67, 69) used in the sub-composites (75, 75', 75") do not include continuous or semi-continuous fibers therein, thus expediting hole formation there-through.
Abstract:
A wiring board of the present invention is structured with first substrate 1, second substrate 2 having a smaller mounting area than that of first substrate 1, and base substrate 3 laminated between first substrate 1 and second substrate 2, and having vias 44 formed in at least either first substrate 1 or second substrate 2 and a through-hole 63 which penetrates base substrate 3.