Abstract:
A method and a structure for a coaxial via that extend along the entire length of a signal via in a printed circuit board. Signal integrity is improved by providing ground shield for the entire length of the coaxial via. The ground shielding can be implemented by either providing ground cage vias around a signal via and routing a trace to the signal via on a built up layer or by providing a semi circle ground trench through a build up layer to permit a trace access to the signal via.
Abstract:
A power switching device is provided that includes a housing, a printed circuit board disposed within the housing, and a plurality of electrical components mounted to the printed circuit board, including at least one relay. At least one pair of load terminals is connected to the printed circuit board on opposite sides of the relay, and a plurality of heat transfer elements are formed through and in the printed circuit board and are dispersed proximate the relay, around the load terminals, and extending to the peripheral portion.
Abstract:
Systems and methods are taught for blocking the propagation of electromagnetic waves in parallel-plate waveguide (PPW) structures. Periodic arrays of resonant vias are used to create broadband high frequency stop bands in the PPW, while permitting DC and low frequency waves to propagate. Some embodiments of resonant via arrays are mechanically balanced, which promotes improved manufacturability. Important applications include electromagnetic noise reduction in layered electronic devices such as circuit boards, ceramic modules, and semiconductor chips.
Abstract:
A film type conductive sheet made of synthetic resin having horizontal and vertical directional conductivities, capable of preventing burrs causing electric short-circuits, and having a narrow thickness while maintaining the horizontal and vertical directional conductivities is disclosed. The film type conductive sheet includes a synthetic resin master film having a plurality of penetrating holes, and metals or metal pastes coated to the upper and lower sides of the synthetic resin master film such that the metals are connected to each other through the penetrating holes, enabling vertical conduction and horizontal conduction thereof. Since burrs are not generated when cutting and using the film type conductive sheet, and applying the same to equipment so that electronic equipment malfunction due to interference between circuits is prevented. Since a very thin film type conductive sheet can be made, the film type conductive sheet is applicable to wide range of applications.
Abstract:
A capacitor structure of a wiring board having large capacitance per unit area is disclosed. A first pattern (3) is formed on the upper side of an insulator layer (2), and a second pattern (4) is formed on the lower side. In the insulator layer (2), first vias (5) and second vias (6) are formed, and the wall surfaces of the first vias (5) and the second vias (6) are plated. The first pattern (3) with first vias are lands while the second pattern (4) with first vias are blanks. The second pattern (4) with second vias (6) lands while the first pattern (3) with second vias (6) blank.
Abstract:
A thermal management device (13) comprising anisotropic carbon (10) encapsulated in an encapsulating material (12) that improves the strength of the carbon. The encapsulating material may be polyimide or epoxy resin or acrylic or polyurethane or polyester (12) or any other suitable polymer.
Abstract:
Substrate (7; 7'; 10) and devices including such a substrate, the substrate having a first surface and a second surface extending substantially in parallel to the first surface, the substrate being of a material of a first conductivity and provided with a plurality of electrically conducting channels (21) which are extending exclusively in a direction perpendicular to the first and second surfaces, said channels having a second conductivity substantially larger than the first conductivity, the substrate being provided with at least one electrode (42) on either one of the first and second surfaces, contacting at least one of said channels, the at least one electrode (42) having a predetermined minimum dimension (D) in a contact area (A) with the substrate, and mutual distances between adjacent ones of the plurality of channels (21) being smaller than said minimum dimension of said at least one electrode (42).
Abstract:
The process for producing subsequently contactable contact points between two conductive track planes on a circuit substrate separated by an electrically insulating layer makes it possible to produce, for example, a basic conductor pattern which can subsequently be easily adapted to requirements. By laying windows in the conductive track planes out in such a way that, when the electrically insulating layer is subsequently through-etched due to under-etching, rod-like parts connected to the aperture periphery are revealed between or in the apertures which can be brought into contact with electrically conductive parts of the other conductive track plane, these conductive tracks can be electrically interconnected by mechanical bending.