Abstract: Both a co-fired ceramic package for a power circuit is disclosed as well as a method of manufacture thereof. The package includes a base which is formed from a plurality of pyrolizable ceramic films, each of which includes a heat-conductive and electrically insulative ceramic material such as aluminum nitride, silicon carbide or beryllium oxide embedded within a binder. In the method of the invention, two or three ceramic films are metalized with a pattern of conductive material on their top surfaces. The resulting metalized films are then stacked over a plurality of unmetalized ceramic films, and the resulting aggregate stack is laminated together by the application of heat and pressure. Electrical components are then soldered onto the top surface of the base, and a cover is sealingly connected around the resulting hybrid circuit. The metalization step advantageously forms terminals around the cover which allow access to the heat generating power circuit without the need for glass post seals.

Abstract: An arrangement to provide an electronic enclosure joint that reduces both electromagnetic and radio frequency radiation between walls of an enclosure of an electronics product has a corrugated metal strip serving as a gasket. The walls of the enclosure have inner conductive surfaces which contact the apices of the corrugated strip. The walls form a channel for the corrugated strip, with the inner conductive surfaces being kept a pre-determined distance apart. The force exerted by the corrugated strip provides electrical continuity between the inner conductive surfaces, while plastic deformation of the strip is avoided by maintenance of the pre-determined distance between the inner conductive surfaces. Because of the relatively low force needed to ensure electrical continuity, creep-prone materials such as plastic can be used for the walls, without the need for an excessive amount of fasteners to hold the walls together against the force exerted by the corrugated strip.

Abstract: An EMI/RFI shielding gasket comprising a resilient elastomeric core enveloped with a fine, open format knit or braided wire mesh, and having a strip of pressure sensitive adhesive disposed lengthwise along a surface of the gasket. This strip of adhesive allows the gasket to be removably fastened to an enclosure, circumventing the need for a metal clip and thus making the gasket lighter and less expensive than conventional gaskets.

Abstract: An electromagnetic shielding device for use along gaps between relatively movable surfaces of doors, access panels, drawers, and cabinets, etc., includes an electrically conductive shielding strip and a clamping element. The shielding device also includes a mechanism that secures the shielding strip to the clamping element when the shielding device is not mounted on a surface. When mounted on a surface, the shielding strip is held in position by the clamping element. The shielding strip is formed so as to avoid being exposed to excessive stress.

Abstract: A slide fastener chain, which possesses an ability to intercept electromagnetic waves, comprises a fastener tape made of a synthetic fiber or a natural fiber which has been coated with a three-ply electroconductive layer of Ni, Cu and Ni, which was produced sequentially by coating nickel, copper and nickel on the fastener tape by electroless plating and the fastener chain includes electroconductive fastener elements being planted along one lateral edge of the fastener tape.

Abstract: A flip-chip package for integrated circuits is provided by over-molding an integrated circuit assembly which includes a flip-chip mounted to a very thin chip carrier. The flip-chip includes an array of bumped pads which fill an array of matching conductive through holes on the chip carrier and securely couple thereto. The chip carrier includes an array of bumped contacts on its back surface which correspond to the bumped pads of the flip-chip. The transfer over molding of the integrated circuit assembly provides a layer of epoxy around the exposed surfaces of the flip-chip providing an environmentally protected and removable integrated circuit package.

Abstract: Composite materials for electronic packages are disclosed. The composite materials comprise a core layer and first and second cladding layers. The core and cladding layer compositions and thicknesses are selected to maximize thermal and electrical conductivity and to minimize the coefficient of thermal expansion of the composite. The composite material may be employed to fashion the package base, the leadframe, a heat spreader or combinations thereof. In one embodiment, a portion of the first cladding layer is removed so that an electronic device may be mounted directly to a high thermal conductivity core.

Abstract: A shielded cable entry device allows direct connection to internal equipment using cables fitted with connectors at each end, while maintaining the EMI integrity of the cabinet. Two versions are disclosed. One having two body members and a securing nut. Each of the body members includes a semihexagonal flange, semicylindrical shells for making contact with the cable shielding and receiving compressing springs and a threaded section. The nut has a slot which allows it to slip onto a cable. The other having two similar body members formed from sheet metal. Each body member having semicylindrical shells for making contact with the cable shielding and receiving the springs and a folded plate flange.

Abstract: The conductive seal of the present invention comprises the conductive layer and the sealing member. The conductive layer is composed only for providing conductivity, and the sealing member is composed only for providing a sealing effect. The conductive layer is such a thin coat that the conductive seal as a whole has a sufficient sealing effect, when it is applied onto the housing. Owing to such a sufficient sealing effect, the conductive layer can be securely adhered to the housing. Consequently, the conductive seal protects the electronic equipment from electromagnetic waves and prevents electromagnetic waves generated by the electronic equipment from leaking outside. The conductive layer is so thin that manufacturing cost can be reduced even when silver powder or copper powder is used for the layer.

Abstract: The present invention relates to gasket for electromagnetic shielding. The gasket is formed of an elastomeric core and one or more bands of electrically conductive textile material which surrounds and is partially embedded in the core.

Abstract: An electromagnetic shielding device for use along gaps between relatively movable surfaces of doors, access panels, drawers, and cabinets, etc., includes an electrically conductive shielding strip formed of longitudinally arranged segments integrally connected by a carrier strip. Each segment is mounted on a corresponding segment of a mount track which is adapted to securely lock the shielding strip in place. The design of the electromagnetic shielding device of the present invention provides enhanced capabilities of electromagnetic shielding as well as improvements in structural rigidity and mechanical durability. The design also facilitates installation of shielding in confined areas and repair of damaged shielding.

Abstract: In one embodiment, a microwave package is constructed from a block of aluminum having layers of material clad to opposite sides thereof having a lower coefficient of thermal expansion than the aluminum block. A receptacle is formed by milling away a portion of one of the layers and a large portion of the aluminum while maintaining an aluminum base or floor within the receptacle. Ceramic substrates can be attached to the floor and connected to wires which extend through feedthrough openings either in the aluminum side walls of the receptacle or through the clad material. A cover can be hermetically attached, as by welding, to the layer of clad material to complete the microwave package assembly. An alternative form of the invention, a metal matrix material can be used which has a layer of copper or aluminum clad to the top surface. The microwave package is formed by milling away a portion of this top surface to form the container.

Abstract: A sealing arrangement for sealing a door or other closure against leakage of EMI (electromagnetic interference) from an enclosure comprises a flexible strip overlying a peripheral portion of the door. The flexible strip is attached to the door along its innermost edge. A magnet strip or the like urges the flexible strip into contact with the enclosure to be sealed. The magnet strip may be mounted on the closure, and trap the flexible strip against the frame, or be mounted upon the frame and pull the flexible strip onto the frame. Protuberances at intervals along the flexible strip provide reliable electrical contact between the flexible strip and the enclosure. The closure need not be a door, supported using hinges, but might be a panel supported solely by adhesion of the magnet strip to the enclosure. A plurality of such panels might be used to clad, and seal, an equipment rack of the open-framework kind.

Abstract: Two sets of filaments (38, 72) are mounted on opposite sides of a discontinuity (6) between a movable or removable panel (4) and adjacent outer skin portions (2) of an aircraft. The filaments (38, 72) have retracted positions in which they are out of engagement with each other. With the filaments (38, 72) retracted, the panel (4) is moved into its use position flush with the outer surface of the skin (2). The filaments (38, 72) are then extended into the discontinuity (6) by a mechanism, such as a cam-ratchet (44) or an inflatable bladder (68). The extended filaments (38, 72) interdigitate to seal the discontinuity (6) and simulate a solid surface across the discontinuity (6).

Abstract: A magnetic shield is designed to be retrofitted over a flyback transformer of a cathode ray tube display terminal. The magnetic shield consists of a layer of metal conductor, for example mu metal, and a layer of insulation, for example polyester film. The layer of insulation is placed upon the layer of metal conductor and the layers are rolled to form a spiral having greater than two windings. Tape may be used to secure the shape of the spiral. Additionally foam rubber pads may be attached to the inside of the spiral to provide a secure mechanical mounting to the flyback transformer and to provide air spacing as additional insulation against corona discharge. Also shrink tubing may be placed over the spiral to provide additional support to the spiral shape and to provide heat and electrical insulation.