The present application relates to an electromagnetic wave shielding film, which can provide an electromagnetic wave shielding film having excellent mechanical strength, flexibility, electrical insulation properties, bonding properties with other constituents, oxidation and high-temperature stability and the like, while having excellent electromagnetic shielding ability.

An apparatus includes a ear piece case housing, a receptacle within the ear piece case housing and configured to hold an earpiece, an earpiece connector at the receptacle and configured to electrically connect with the earpiece, and electromagnetic shielding materials integrated into the ear piece case housing to electromagnetically isolate the earpiece while the earpiece is contained within the case housing. The ear piece case housing may include a charger and a removable slide cover adapted for sliding over the charger.

A housing wall comprises at least one air grid having at least a first layer with a first mesh structure and a second layer with a second mesh structure. The first mesh structure is coextensively arranged with the second mesh structure. The first layer and the second layer are electrically conductively coupled. The first mesh structure includes a first plurality of through-holes. The second mesh structure includes a second plurality of through-holes. The through-holes of the first plurality of through-holes are misaligned compared to through-holes of the second plurality of through-holes such that a nonuniform total through-hole configuration of the air grid is provided.

A signal isolation device includes at least one electromagnetic band-gap unit. The at least one electromagnetic band-gap unit includes a substrate, a metal foil main body, and a plurality of T-shaped metal foil features. The metal foil main body is disposed on the substrate, and the metal foil main body is square. The T-shaped metal foil features is disposed on the substrate and extending from a periphery of the metal foil main body. The T-shaped metal foil features are in a rotational symmetry around a center of the metal foil main body.

Embodiments relate to materials and methods for manufacturing the materials for an enclosure that houses one or more electronic devices. In some embodiments, the materials include a tuned micro-lattice that includes one or more metallic materials defining a micro-lattice configuration. In some embodiments, the one or more metallic materials extend over at least a portion of an elastomeric material. In some embodiments, the materials include a tuned composite metallic foam including one or more metallic materials. A first portion of the foam has a first porosity and a second portion of the foam has a second porosity. In some embodiments, the materials for the enclosure are one or more of a gasket and a coating that extends over a least a portion of an interior portion of the enclosure.

A panel for an electromagnetic shield includes a light-weight, porous, electrically-conductive core layer of metallic foam having generally parallel opposed surfaces and a face sheet having rigidity properties superior to the rigidity properties of the core layer laminated to a surface of the core layer. Alternatively, a panel for a broadband electromagnetic shield includes a composite fiber-reinforced core having opposed surfaces and a layered electrically-conductive composite cover disposed on a surface of the core. The cover includes a first stratum of porous metal exhibiting pronounced low-frequency electromagnetic shielding properties and a second stratum of electrically-conductive elements exhibiting pronounced high-frequency electromagnetic shielding properties secured in an overlapping electrically-continuous relationship to the first stratum, the first stratum being a metallic lattice, and the electrically-conductive elements being a non-woven veil of electrically-nonconductive metal-coated fibers.

A shielded combined optical communication and conductor cable is provided. The cable includes a cable body having an inner surface defining a channel within the cable body. The cable includes an optical transmission element located within the channel and an electrical conducting element located within the channel. The cable includes an electromagnetic shield located within the channel and surrounding at least the electrical conducting element. The electromagnetic shield includes an elongate yarn strand or other strand material that supports a metal material that acts to limit electromagnetic fields from traversing across the electromagnetic shield. The strands may be unbraided and may be helically wrapped or longitudinally positioned within the cable body.

A near-field electromagnetic wave absorbing film comprising a thin metal film formed on a surface of a plastic film; the thin metal film being provided with plural lines of laser-etched openings extending and crossing in two directions; pluralities of laser-etched openings being arranged in each line such that at least part of adjacent laser-etched openings are separated; the laser-etched opening lines extending in two directions crossing at an angle of 45-90°; thin metal film portions remaining after forming the laser-etched openings being composed of wide remaining portions partitioned by the laser-etched opening lines, and bridge-like remaining portions connecting adjacent wide remaining portion; and the bridge-like remaining portions having widths of 20 μm or less; thereby having electric resistance of 50-300 Ω/100 cm.sup.2 and light transmittance (measured with laser rays having a wavelength of 660 nm) of 30-80%.

Embodiments of the present invention provide an improved access control unit with an asymmetric transmission pattern. A shielded backplate reduces the interior transmission pattern. The secure side transmission pattern is much smaller than the unsecure side transmission pattern, such that a credential located within the secure side area of a building is not likely to trigger the access control unit, thus reducing the risk of an unauthorized access.

An equipment enclosure (1) for electromagnetically isolating an electronic device, the equipment enclosure 1 comprising a conductive housing (3) and a plurality of conductive sheets (5). Each sheet (5) includes an aperture (7). The sheets (5) are stacked in a spaced-apart relationship within the housing (3) thereby defining a plurality of electromagnetically-isolated cavities (9) each within a respective Faraday cage formed by the conductive housing (3) and the conductive sheets (5). The apertures (7) form a channel (11) that extends through the enclosure (1) providing a route for connections between the cavities (9).