1379 results about "Loop antenna" patented technology

A wireless communication system is provided that includes an antenna structure adapted for coupling to a medical device antenna when the medical device is not implanted in a patient's body. The antenna structure effectively extends the medical device antenna length, thereby improving the efficiency and reliability of a communication link between the medical device and a programmer or monitor outside the implanted environment. The antenna structure is fabricated from any conductive material, which may be in the form of conductive wire, tape, ink, foil, film, adhesive or the like, and is attached to a portion of a medical device packaging assembly or another accessory device or substrate such as a pouch or overlay. The antenna structure may be a monopole, dipole, slot antenna, microstrip patch, or loop antenna, and may be fixed or movable relative to the substrate on which it is implemented.

An apparatus for transmitting power wirelessly is provided. The apparatus comprises: a dielectric resonator which generates evanescent waves in a predetermined direction in order to transmit power; and a loop antenna which is coupled to a surface of the dielectric resonator and supplies power to the dielectric resonator. The dielectric resonator transmits power by means of evanescent waves generated in directions perpendicular to top and bottom surfaces of the dielectric resonator and by radiation in directions parallel to the top and bottom surfaces of the dielectric resonator. Accordingly, efficient power transmission over short and long distance ranges is possible.

The wireless communication system includes a first device, e.g. a radio frequency identification (RFID) reader, having a wireless power transmitter, a first wireless data communications unit, and a first dual polarized loop antenna having isolated signal feedpoints along a first loop electrical conductor. The wireless power transmitter transmits a power signal having a first polarization, and the first wireless data communications unit communicates using a data signal having a second polarization. A second device, e.g. an RFID tag, includes a second dual polarized loop antenna. A second wireless data communications unit communicates with the first wireless data communications unit of the first device using the data signal having the second polarization. A wireless power receiver receives the power signal having the first polarization from the wireless power transmitter of the first device, and provides power for the second device.

A multi-band antenna (1) used in an electronic device and formed of a metallic sheet by defining holes therein, including a first radiating portion (30), a second radiating portion (31), a third radiating portion (32), a ground portion (2), and a coaxial transmission line (4). The first radiating portion, the ground portion and the coaxial transmission line cooperatively form a loop antenna operated at a higher frequency band of about 5.15-5.875 GHz. The second radiating portion, the ground portion and the coaxial transmission line cooperatively form a first inverted-F antenna operated at another higher frequency band of about 5.725-5.875 GHz. The third radiating portion, the ground portion and the coaxial transmission line cooperatively form a second inverted-F antenna operated at a lower frequency band of about 2.4-2.5 GHz.

Provided is a digitizer function-equipped liquid crystal display device capable of preventing the wire shadows of a loop antenna from being projected on a liquid crystal panel and capable of being applied to a large size liquid crystal panel. It is also possible to provide an information processing electronic device and a game device provided with the digitizer function-equipped liquid crystal display device. Here, the digitizer function-equipped liquid crystal display device includes: a liquid crystal panel 1; a light diffusion member 2 which is disposed between the liquid crystal panel 1 and a backlight 5 irradiating the liquid crystal panel 1 with light; an electromagnetic induction type loop antenna which is disposed at a portion apart from the light diffusion member 2 in the direction toward the backlight 5 by a predetermined spacing so as to detect a position on the plane of the liquid crystal panel 1 in one coordinate axis direction and another coordinate axis direction that intersects the one coordinate axis direction; and a spacing retaining means for retaining the spacing between the light diffusion member 2 and loop antenna at a predetermined spacing value. As the spacing retaining means, a first light transmitting member 3 formed of a plate material having a light transmitting property is used.

A combined resistivity tool incorporating both induction/propagation antennas and lateral resistivity antennas disposed in recesses of downhole tubulars, in which a lateral resistivity antenna includes an insulating base layer disposed in the recess; a toroidal antenna disposed over the insulating base layer; and a shield disposed over the recess.

An antenna apparatus includes a minute loop antenna and at least one antenna element. The minute loop antenna is provided to be electromagnetically close to a dielectric substrate including a grounding conductor, has a predetermined number N of turns and a predetermined minute length, operates as a magnetic ideal dipole when a predetermined metal plate is located closely to the antenna apparatus, and operates as a current antenna when the metal plate is located apart from the antenna apparatus. The antenna element is connected to the minute loop antenna, and operates as a current antenna. In the antenna apparatus, one end of the antenna apparatus is connected to a feeding point, and another end of the antenna apparatus is connected to the grounding conductor of the dielectric substrate.

An array antenna apparatus includes a first feeding element having a first feed point, a second feeding element having a second feed point, and a first parasitic element electrically connected to the respective first and second feeding elements. In a first frequency band, respective resonances in the feeding elements occur independent of each other, by eliminating electromagnetic mutual coupling between the feeding elements, and exciting the first feeding element through the first feed point as well as exciting the second feeding element through the second feed point. In a second frequency band lower than the first frequency band, a loop antenna having a certain electrical length is formed by the first and second feeding elements and the first parasitic element, and a resonance of the loop antenna substantially occurs by exciting the first feeding element through the first feed point.

A watch-type mobile terminal including an antenna is provided. The watch-type mobile terminal may include a body configuring an external appearance of a watch and operating as a loop antenna, a plurality of feeding units applying each of a plurality of communication signals to the loop antenna, and a ground part connected to a ground of the watch. In this case, the body may include a metal housing connected to the ground part and corresponding to an outer loop, a metal bezel connected to the plurality of feeding units and corresponding to the inner loop, and a slot member disposed between the metal housing and the metal bezel to electrically disconnect the metal housing from the metal bezel. An antenna for providing a plurality of communication services may be provided.

A dielectrically-loaded loop antenna with a cylindrical dielectric core, a feeder structure passing axially through the core, a sleeve balun encircling one end portion of the core and helical antenna elements extending from a feed connection with the feeder structure at the other end of the core to the rim of the balun. The antenna elements are arranged as a pair of laterally opposed groups of conductive elongate helical elements each having at least first and second conductive elements of different electrical lengths to form a plurality of looped conductive paths. By forming at least one of the conductive elements in each group as a conductive strip with one or both edges meandered, such that the edges of the strip are non-parallel and have different electrical lengths, additional modes of resonance arc created, yielding an improvement in bandwidth.

Disclosed is a multiple loop antenna for a radio frequency identification (RFID) reader, and more particularly, to a multiple loop antenna for a RFID reader that reads information stored in a RFID tag or inputs new information to the RFID tag by inductive coupling.

The multiple loop antenna for a RFID reader serves to communicate information with the RFID tag by inductive coupling, and includes at least three winding groups where they have at least one turn for each group. The winding groups are connected to one another in series and in parallel.

And the same structure is also applicable to RFID tag antenna.

Various exemplary embodiments of the present disclosure may provide an electronic device including an antenna with a ring-type structure. The electronic device includes a metal bracket and the antenna. The antenna includes a first metal ring surrounding the metal bracket, where the first metal ring has at least two sections separated by at least one gap. At least one section may operate as a radiator through radio frequency (RF) feeding at least at one portion thereof. A second metal ring may be electrically connected, at least at one point thereof, to a ground of the electronic device or to the first metal ring. At least one section of the first metal ring may operate as a monopole antenna, as a PIFA antenna, or as a loop antenna, via suitable feeding.

The present invention aims at providing an antenna that exhibits superior communication performance within a communicable area because an air field within the communicable area is reduced while the communicable area is being expanded, and also providing a portable terminal using the same.

In order to accomplish the objective, the antenna of the present invention includes the followings; namely, a loop antenna having an aperture; a metallic body that opposes the loop antenna and that is electrically insulated from the loop antenna; and a notch that is provided in the metallic body and that is coupled with a periphery of the metallic body, wherein at least a portion of the loop antenna opposes the metallic body, and at least a portion of the notch is covered with the aperture.

The present invention comprises systems and methods for cellular, PCS, GPS and/or Bluetooth mobile communication (e.g., a mobile telephone). The systems and methods employ a fully integrated dual band IFA/loop CDMA antenna for cellular and PCS communication. Fully integrating the CDMA antenna within a PWB provides for mitigation of lumped elements to establish dual banding, and can provide for reduced antenna size, device size, cost and interference form a user's hand. The IFA antenna is configured to transmit and receive within the cellular frequency band via a capacitive tap, and the loop antenna is configured to transmit and receive within the PCS frequency band via an impedance matching stub and ground location. The system and methods further employ a firewall to mitigate antenna coupling, and a metal reflector to reduce the electromagnetic reflection, and improve antenna gain and efficiency.

A multi-band antenna (1) includes a ground patch (10), a first radiating patch (21), a second radiating patch (22), a connecting patch (23) connecting the first and second radiating patches with the ground patch, and a feeder cable (40). The ground patch, the connecting patch, the second radiating patch and the feeder cable form a planar inverted-F antenna (PIFA), and the first radiating patch, the connecting patch, the ground patch and the feeder cable form a loop antenna.

The small loop antenna element of the antenna apparatus includes loop antenna portions that have a predetermined loop plane and radiate a first polarized wave component parallel to the loop plane, and at least one connecting conductor that is provided in a direction orthogonal to the loop plane and connects the plurality of loop plane portions to radiate a second polarized wave component orthogonal to the first polarized wave component. In the case of the antenna apparatus located adjacent to a conductor plate, by making the maximum value of the antenna gain of the first polarized wave component and the maximum value of the antenna gain of the second polarized wave component substantially identical when the distance between the antenna apparatus and the conductor plate is changed, a composite component of the first and second polarized wave components are made substantially constant regardless of the distance.