Abstract:
A via on a printed circuit board having a circuit has a first interconnect and a second interconnect located about at least a portion of the first interconnect. The second interconnect connects to ground of the circuit and is coaxial and substantially concentric with the first interconnect and inductively coupled with the first interconnect. A method of electrically interconnecting at a via multiple layers on a printed circuit board to provide a common ground plane for a circuit is also provided. A high speed interconnection can be attained by allowing the ground return path for a circuit carried on multiple layers of a multilayer printed circuit board to remain coupled to the signal, thereby lowering ground inductance and maintaining signal integrity, even at UHF, while minimizing costs.
Abstract:
The present invention provides a semiconductive substrate which includes front and back surfaces and a hole which extends through the substrate and between the front and back surfaces. The hole is defined in part by an interior wall portion and forms an outer conductive sheath. Conductive material is formed proximate at least some of the interior wall portion. Subsequently, a layer of dielectric material is formed within the hole, over and radially inwardly of the conductive material. A second conductive material is then formed within the hole over and radially inwardly of the dielectric material layer. The latter conductive material constitutes an inner conductive coaxial line component.
Abstract:
Methods and apparatus for forming a metal shield on a printed circuit board (10) include a layer of dielectric material (23) one or more printed circuits (21) on the layer of dielectric material (23), a layer of metal (27) on the layer of dielectric material (23), a metal-clad trench or opening surrounding the printed circuit (44) and electrically connected to the layer of metal (27), a solder pad (24) on the layer of dielectric material (23), a microvia (25) through the solder pad (24) and the layer of dielectric material (23), and electrical components (11) soldered to the solder pads (24) and to the printed circuit (21).
Abstract:
An RF interconnect is incorporated in RF module packages for direct attachment onto a multi-layer PWB using compressible center conductor (fuzz button) interconnects. The module has circuitry operating at microwave frequencies. The module package includes a metal housing including a metal bottom wall structure. The module includes a plurality of RF interconnects, which provide RF interconnection between the package and the PWB. Each interconnect includes a feedthrough center pin protruding through an opening formed in the metal bottom wall, with isolation provided by a dielectric feedthrough insulator. The center pin is surrounded with a ring of shield pins attached to the external surface of the bottom wall of the module housing. The pins are insertable in holes formed in the PWB, and make contact with fuzz button interconnects disposed in the holes. Circuitry connects the fuzz button interconnects to appropriate levels of the PWB for grounding and RF signal conduction.
Abstract:
An electronics assembly incorporating an interconnect includes a conductive gasket disposed between a first printed circuit board and a second printed circuit board. The gasket surrounds, and thereby shields, the interconnect while providing an RF ground connection between the two boards with a controlled RF impedance. The second printed circuit board may serve as a connector board for a plurality of modules, or other printed circuit boards, to be coupled thereto. Each module is individually covered with a separate lid. Methods for manufacturing and assembling structures according to the invention are also provided.
Abstract:
A “Gatling gun” via to interconnect circuitry from a first side of a substrate or printed circuit board, to a second side of the substrate or board. The present via structure comprises a center conductor via surrounded by a plurality of ground vias. The plurality of ground vias shield the center conductor via, thus providing electrical isolation for the conductor via from the rest of the circuitry. In one embodiment, the conductor via is electrically connected to a conductive pattern on the substrate by a wire bond.
Abstract:
A front-and-back electrically conductive substrate includes a plurality of posts composed of a material that can be anisotropically etched and having an electrically conductive portion that has at least a first surface and a second surface that communicate with each other, and an insulative substrate that supports the plurality of posts.
Abstract:
A multilayer wiring board comprises: a metal substrate as a core, a condenser dielectric layer formed to cover the metal layer, and a condenser electrode metal layer formed to cover the condenser dielectric layer, so that a condenser is defined by the metal substrate, the condenser and the condenser electrode metal layer. The condenser dielectric layer is provided with a first contact hole to communicate with the metal substrate and the condenser electrode metal layer is provided with a second contact hole to communicate with the first contact hole, the diameter of the second contact hole being larger than that of the first contact hole. An insulating layer is formed on the condenser electrode metal layer and is provided with a via hole to communicate with the metal substrate through the second and first contact holes. A metal substrate contact metal layer formed on an inner wall of the via hole, so that the metal substrate contact metal layer comes into electrical contact with the metal substrate.
Abstract:
A surface mountable coaxial solder interconnect. The invention provides a small, low-cost, passively self-aligning, high-frequency electronic interconnect adapted to mass production and method. The invention includes a substrate, a signal conductor, and an annular conductor. The substrate incorporates an annular pad and a signal pad substantially centered within the annular pad. The signal conductor includes reflowed solder and is wetted to the signal pad. Similarly, the annular conductor includes reflowed solder and is wetted to the annular pad. The invention may also provide a second substrate substantially parallel to the first substrate that includes a second annular pad and a second signal pad substantially centered within the second annular pad. In such a case, the signal conductor is also wetted to the second signal pad, and, similarly, the annular conductor is also wetted to the second annular pad. The method of the invention includes obtaining a mask and a substrate. The mask obtained defines a center cavity and an annular cavity surrounding the center cavity, and may also define an outer cavity in fluidic communication with the annular cavity. The substrate obtained includes a solder-wettable signal pad, and a solder-wettable annular pad surrounding the signal pad. The mask is then filled with solder paste and aligned with the substrate such that the center cavity of the mask is in registry with the signal pad. The solder paste is then reflowed, generating solder wetting the solder-wettable signal pad and the solder-wettable annular pad.
Abstract:
A via structure is obtained by etching a through-hole in a substrate on the via location and placing transmission lines on declining or sloping sidewalls of the hole. The lines continue to conductors on the other surface of the substrate through vias located in a free portion of a thin film structure at the bottom side of the substrate. The free portion is so strong and large, that several vias can be made therein for connection to a plurality of parallel lines forming e.g. a bus structure. The large free portion can be additionally supported by a thick support layer applied on top of the layers in the hole. By applying an isolated ground plane and a dielectric layer between the substrate and the transmission lines, the transmission lines on the sloping sidewalls of the via hole structure can be made impedance matched. The sloping sidewalls of the via hole can easily be obtained using a V-groove etch for a monocrystalline Si-substrate. The via structure obtained is especially well suited for data transmission buses, which do not need to reduce their transmission line density through the via structure.