Abstract:
An hermetically sealed integrated microwave circuit comprising a coplanar waveguide on a printed circuit board (PCB) electrically connected on one major surface to an integrated circuit, and thermally and electrically connected to a ball grid array (BGA) on its opposite major surface, in which the PCB has at least first and second printed layers, a microwave signal path extends from a ball of the BGA through a through-hole in both printed layers to the coplanar wave guide, and plural ground paths extend from balls of the BGA through first through-holes in the first printed layer of the PCB and through second through-holes of the second printed layer of the PCB, the first and second through-holes being non-coincident, to allow for an hermetic seal across the PCB whilst introducing a predetermined impedance in the PCB between the signal and ground paths.
Abstract:
A flexible multilayer printed circuit assembly with shield fences. The flexible multilayer printed circuit assembly with multiple conductive layers includes logic ground vias that connect logic ground plane layers together, and shield vias that connect a top and a bottom shield plane layer together. Each of the shield fences is formed between the shield vias on an outside perimeter of each of the conductive layers. Each of the shield fences contains the logic ground vias inside, and also contains each corresponding conductive layer in the horizontal direction to which each layer extends.
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 for displaying images are provided. An embodiment of a system comprises a liquid crystal display module, and the liquid crystal display module comprises a backlight assembly. The backlight module primarily includes a circuit board and at least an LED disposed on a first planar side of the circuit board. The circuit board comprises at least a hole and a heat conductor extending through the hole. Heat from the LED on the first planar side is dissipated to a second planar side of the circuit board by the heat conductor through the hole.
Abstract:
Signal line conductors passing through vertical vias in an insulative substrate for supporting and interconnecting integrated circuit chips are provided with shielding conductors in adjacent vias that link respective power and ground planes. The shielding conductors' presence in positions around a signal via is made possible through the employment of power plane and ground plane conductive grids that are laid out in rhomboid patterns. The power plane and ground plane grids possess a left-right mirror relation to one another and are displaced to place the rhomboid's corners to avoid overlapping any of the grid lines.
Abstract:
A high-frequency Electromagnetic Bandgap (EBG) device, and a method for making the device are provided. The device includes a first substrate including multiple conducting vias forming a periodic lattice. The vias of the first substrate extend from the lower surface of the first substrate to the upper surface of the first substrate. The device also includes a second substrate having multiple conducting vias forming a periodic lattice. The vias of the second substrate extend from the lower surface of the second substrate to the upper surface of the second substrate. The second substrate is positioned adjacent to, and overlapping, the first substrate, such that the lower surface of the second substrate is in contact with the upper surface of the first substrate, and such that a plurality of vias of the second substrate are in contact with a corresponding plurality of vias of the first substrate.
Abstract:
Systems for displaying images are provided. An embodiment of a system comprises a liquid crystal display module, and the liquid crystal display module comprises a backlight assembly. The backlight module primarily includes a circuit board and at least an LED disposed on a first planar side of the circuit board. The circuit board comprises at least a hole and a heat conductor extending through the hole. Heat from the LED on the first planar side is dissipated to a second planar side of the circuit board by the heat conductor through the hole.
Abstract:
A method and structure are provided for implementing enhanced interconnection performance of an electrical connector, such as a land grid array (LGA) module, and a printed wiring board. A multi-layer printed wiring board includes a plurality of predefined ground and power layers. At least one of the predefined ground and power layers includes a thickness variation minimizing structure for minimizing thickness variation. The thickness variation minimizing structure includes a perforated pattern within a selected area of the at least one of the predefined ground and power layers. The selected area is proximate to predefined module sites, such as land grid array (LGA) module sites, in the ground and power layers. The selected area can include regions surrounding each predefined module site, and also can include a region within the module site.
Abstract:
A substrate is provided, which has a pattern of voltage supply vias extending through at least a portion of the substrate. Each of a plurality of the voltage supply vias is surrounded by four of the voltage supply vias of a same polarity in four orthogonal directions and by four voltage supply vias of an opposite polarity in four diagonal directions.
Abstract:
In a transmission circuit board, ground terminal portions (10) are disposed at every other two rows in both end columns. Each of signal circuit layers (20) includes at least a pair of adjacent signal connecting portions electrically connected to a pair of the wiring portions (21, 22) arranged in parallel in a row direction and the column direction different from those on an adjacent signal circuit layer. Each of the ground layers is electrically connected to at least one of the ground terminal portions (10) in the both end columns.