Abstract:
An electrically conductive circuit member for use within a multilayered circuit board assembly wherein the member comprises a sheet of electrically conductive material (15) (e.g., copper) and first and second layers (21, 22) of electrically insulative material (e.g., prepreg) bonded thereto to substantially encapsulate the conductive material therein. The conductive material includes a plurality of apertures (41) and a plurality of elongated openings (17, 45), which openings are mechanically provided in a predefined pattern to assure at least two electrically isolated regions within the singular, planar conductive material. A method of making this circuit member is also defined, said method not requiring the need for wet/chemical processing and the disadvantages associated therewith.
Abstract:
A multilayer printed wiring board comprises at least one layer with interlayer connection pattern (200, 300) at the basic grids. The interlayer connection pattern (200, 300) has a clearance (62, 204, 304) when a small diameter through hole (60B) is formed and has a land part (63, 205, 303) contacted to the through hole wall (61A) when a large diameter through hole (60A) is formed. In order to obtain interlayer connection or non-connection, the diameter of a through hole is varied.
Abstract:
An impedance matching stripline transition for microwave signals which are conducted from a stripline circuit on one laminate (2) to another laminate (4) through a number of intermediate laminates (3). The connection between an incoming stripline circuit (21) on one laminate (2) to the outgoing stripline circuit (41) on the other laminate is performed as a short coaxial line. The outer conductor of the coaxial line is formed by a number of through-plated holes (12, 13, 23, 33, 43) in horseshoe form around a central conductor of through-plated holes (24, 34). The outer conductor is connected with the earth plane (31, 11, 45) of the laminates. They serve simultaneously as suppressor of not desired modes in the microwave signals which is supplied to the transition via the conductor (21).
Abstract:
Provided are semiconductor packages comprising at least one thin-film capacitor attached to a printed wiring board core through build-up layers, wherein a first electrode of the thin-film capacitor comprises a thin nickel foil, a second electrode comprises a copper electrode, and a copper layer is formed on the nickel foil. The interconnections between the thin-film capacitor and the semiconductor device provide a low inductance path to transfer charge to and from the semiconductor device. Also provided are methods for fabricating such semiconductor packages.
Abstract:
High capacitance value capacitors are formed using bimetal foils (120, 130) of an aluminum layer (124, 134) attached to a copper layer (122, 132). The copper side of a bimetallic copper/aluminum foil or a monometallic aluminum foil is temporarily protected using aluminum or other materials, to form a sandwich. The exposed aluminum is treated to increase the surface area of the aluminum by at least one order of magnitude, while not attacking any portion of the protected metal. When the sandwich is separated, the treated bimetal foil (120 or 130) is formed into a capacitor, where the copper layer (122 or 132) is one electrode of the capacitor and the treated aluminum layer (124 and 324 or 134 and 334) is in intimate contact with a dielectric layer (540) of the capacitor.
Abstract:
A compact Ku band microwave diplexer configured as a three port surface mount component on a miniature alumina substrate. Input signals occurring at a common port having frequencies within a first pass band are passed to a second port while being isolated from signals occurring at a third port. Signals occurring at the third port are passed to the common port while being isolated from the signals at the second port. A microstrip dual spur line filter is used combined with open circuit stubs to provide enhanced second harmonic suppression on the transmit side, while using a coupled line microstrip filter on the receive side. This approach allows for compact size and automated component assembly through pick and place and reflow manufacturing techniques.
Abstract:
An impedance matched circuit board utilizes a series of vias, one signal via that is surrounded by four ground vias in order to effect impedance matching with a coaxial signal transmission line. The vias are plated and extend through the thickness of the circuit board. Both opposing surfaces of the circuit board are provided with a conductive ground layer and each such ground layer has an opening formed there that encompasses one or more of the vias. On the top surface the opening surrounds the signal and ground via and on the bottom surface the opening only partially surrounds the signal via and the opening includes a convex portion formed therein.