A sensor system (1000) comprises a tag (100). The tag comprises at least one radio-frequency chip (130) having a memory element, an antenna (140) disposed in electrical communication with output terminals of the chip and a non-conductive coating (115) disposed upon a surface of the tag. The non-conductive coating covers the chip and defines a perimeter. The perimeter is disposed over and exposes the antenna.

Radio frequency identification tag

There is disclosed a meanderline loaded antenna formed by applying a conductive ink or other conductive material to a flexible substrate. The substrate is then shaped by removing regions and folding other regions along perforated or scored lines to fit the antenna within the available space of a wireless device. In lieu of folding regions of a planar substrate to form a three-dimensional structure, the substrate can be vacuum formed over a mandrel after the antenna elements have been formed thereon. The antenna can also be formed by printing on existing enclosure surfaces of a wireless device or on the surfaces of components within the device. Thus the advantages offered by a meanderline antenna where the effective electrical length is greater than the actual physical length are achieved in conjunction with a space-saving physical structure for the antenna.

Fabrication method and apparatus for antenna structures in wireless communications devices

There is disclosed a meanderline-loaded antenna comprising a ground plane, a non-driven element affixed thereto, a driven or receiving element affixed thereto and a horizontal element between the driven and the non-driven elements. The non-driven and the driven elements comprise meanderline-loaded couplers that are oriented parallel to the ground plane and the horizontal element so as to present a low-profile meanderline-loaded antenna.

Low profile, high gain frequency tunable variable impedance transmission line loaded antenna

An antenna having a plurality of conductive layers formed on a dielectric substrate. A ground plate and a feed plate are oriented in substantially parallel relation on two opposing sides of the dielectric substrate. A top plate, which is electrically connected to the ground plate and electrically insulated from the feed plate, is disposed on a third surface of the dielectric substrate perpendicular to the first and the second surfaces. One or more conductive layers are also disposed within the interior of the dielectric substrate parallel to the first and the second surfaces. One or more conductive vias extend between the feed plate and the ground plate through the interior of the dielectric substrate. In various embodiments these conductive vias are connected to one or more of the feed plate, the ground plate, and the interior conductive surfaces.

Low profile dielectrically loaded meanderline antenna

An antenna operative in a plurality of frequency bands. The antenna comprises first and second high band resonators, a resonating meanderline and a counterpoise. A ground return conductively couples one or more regions of the counterpoise to the meanderline. One or more of the first resonating element, the second resonating element and the resonating meanderline are coupled by magnetic and/or capacitive coupling to provide operation in the plurality of frequency bands.

Meanderline coupled quadband antenna for wireless handsets

A frequency-selective directional coupler is provided which comprises a fast-wave transmission line placed in proximity to a slow-wave transmission line. The fast wave line can be a waveguide, strip-line, or microstrip line which follows a fairly direct path between two points. The slow wave line can be a helix or a meander line.

Directional filter using meander lines

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Directional filter using meander lines