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| Number | Title | Issue Date |
| 7855694 | Radio system, radio apparatus, and antenna device According to an aspect of the present invention, there is provided a radio system including: a first radio apparatus that has a first loop antenna; and a second radio apparatus that has a second loop antenna and that performs a radio communication with the first rad... | 12/21/2010 |
| 7817098 | Medical device with a radio frequency detection device A medical device and system is provided with a device housing and with a radio frequency detection device. The radio frequency detection device is functionally connected to an antenna for detecting a radio frequency identification element. The radio frequency detect... | 10/19/2010 |
| 7656361 | Multiple phase shifter for protecting individuals against electromagnetic waves The invention relates to a multiple phase shifter for protecting individuals against electromagnetic waves. The invention comprises several phase shift modules which each comprise two identical or homothetic flat loops which are electrically connected by means of tw... | 02/02/2010 |
| 7642985 | Seat for vehicle A seat for a vehicle includes: a detecting sensor detecting an occupant having a planar antenna electrode, at which electric filed is generated, and a ground electrode arranged with a clearance along an outer periphery of the antenna electrode. The antenna electrode... | 01/05/2010 |
| 7427034 | Information processing apparatus and loop antenna An information processing apparatus for use in a transmitting or receiving operation by a non-contact type IC card function and a reader/writer function includes a loop antenna having a feeding element having a first number of turns winded in a predetermined form, a... | 09/23/2008 |
| 7375635 | Deactivatable RFID labels and tags and methods of making same Disclosed are deactivatable RFID labels and tags in individual and web form, and methods of making same. When it is desired to deactivate the label or tag, the tag or label is subjected to tearing. One arrangement involves providing the label or tag with a tear stri... | 05/20/2008 |
| 7350594 | System and method for tracking and communicating with a boring tool A system for determining the location of and communicating with a downhole tool assembly. A tracker assembly comprises a vertical transmitting antenna, a plurality of receiving antennas, and a processor. The downhole tool assembly has a beacon assembly comprising a ... | 04/01/2008 |
| 7277016 | System and method for disabling RFID tags The invention provides protection to wireless portable transponders from unauthorized interrogation by employing a mechanism for disabling reception by or from the antenna of the transponder. Transponders include RFID tags that are attached to items that a persons m... | 10/02/2007 |
| 7253734 | System and method for altering or disabling RFID tags An arrangement for providing protection to wireless portable transponders (including resonant tags such as RFID tags) from unauthorized interrogation by employing a mechanical arrangement for disabling reception by or from the antenna of the transponder. The tags ca... | 08/07/2007 |
| 7187293 | Singulation of radio frequency identification (RFID) tags for testing and/or programming Methods, systems, and apparatuses for a radio frequency identification (RFID) tag tester/programmer and marker are described. A surface is in contact with a web of RFID tags. The surface has a first portion and a second portion. The first portion of the surface is g... | 03/06/2007 |
| 7187336 | Rotational polarization antenna and associated methods The antenna includes a base and a plurality of antenna feeds carried by the base for respective different rotational polarizations. A plurality of inner elongate convex coupler elements are carried by the base and connected to respective ones of the antenna feeds fo... | 03/06/2007 |
| 7142163 | Loop antenna device A plurality of small loop antenna cells 61, 62 and 63 are magnetically coupled to an antenna coil 8 of a non-contact type data carrier 3. In the plurality of small loop antenna cells, the directions of the magnetic moments of the signals ... | 11/28/2006 |
| 7098866 | Reader or transmitter and/or receiver comprising a shielded antenna The reader or transmitter and/or receiver (22) includes a sheathed antenna formed of two groups of turns or coils (6, 8, 9; 16, 17). The first group of turns or coils forms a sheathed antenna. The second group includes two coils (16, 17) arrange... | 08/29/2006 |
| 7070101 | Loop antenna and contactless IC card read/write apparatus To provide a loop antenna capable of attenuating the distant electric field with the attenuation of the magnetic flux in the vicinity of an electromagnetic wave restrained, and a contactless IC card read/write apparatus. A loop antenna 10 has an electr... | 07/04/2006 |
| 7036734 | Free standing column-shaped structure for housing RFID antennas and readers An RFID system is provided, which includes one or more radio frequency antennas and a generally column-shaped structure. The generally column-shaped structure supports the antenna(s) therein. The structure may include a base portion, a frame portion, one ore more pa... | 05/02/2006 |
| 7023346 | Antenna system including simultaneous phase aiding and phase canceling elements A system for minimizing the effect of null zones in an interrogation zone of a marker detection system. The system includes a reference antenna system configured to produce a first reference electromagnetic field during a first time period. The antenna system also i... | 04/04/2006 |
| 6995732 | Broadband antenna having a three-dimensional cast part An antenna (10) having an emitter element which is positioned in front of a conductive reflector (13) and has a three-dimensional cast part. The cast part is implemented as conductive and has a closed peripheral structure (11) having alternating... | 02/07/2006 |
| 6996075 | Pre-testing and certification of multiple access codes A system, method and article of manufacture are provided for managing the transmission suitability of a channel in a multi access scheme. In general, information relating to noise associated with a channel is obtained. A potential effect of the noise on a transmissi... | 02/07/2006 |
| 6947492 | Encoding and decoding ultra-wideband information A system and a method for encoding and decoding ultra-wideband information are provided. An ultra-wideband transmission is encoded by positioning bipolar pulse pairs. The bipolar pulse pairs assist in detecting errors in the ultra-wideband transmission, before the e... | 09/20/2005 |
| 6937674 | Mapping radio-frequency noise in an ultra-wideband communication system A system and method for mapping radio-frequency (RF) noise, and estimating channel quality in a multi-channel ultra-wideband communication system is provided. One method includes placing a plurality of time bins within a plurality of time frames and assigning a plur... | 08/30/2005 |
| 6924773 | Integrated dual band H-field shielded loop antenna and E-field antenna A dual band antenna system that combines into a single integrated device an H-field shielded loop antenna and an E-field antenna. The system includes an unshielded section bounded on each end by first and second shielded sections, respectively. Input frequency filte... | 08/02/2005 |
| 6911876 | Communication terminal for transceiving two frequencies using a common one turn antenna The invention relates to a terminal for communication with data supports which function in a non-contact manner, comprising a transreceiver circuit with two resonant circuits with antenna and condenser for the emitting of two radio frequency fields of different carr... | 06/28/2005 |
| 6907244 | Hand-off between ultra-wideband cell sites Briefly, the present invention provides a dynamic channel re-assignment capability between mobile units, base stations and sectors within base station coverage areas. The wireless devices used in the present invention may include impulse radio communication devices ... | 06/14/2005 |
| 6680709 | Antenna apparatus There is provided an antenna apparatus in which a non-detection region is made minimum within the regulatory limit of radio wave radiation, and satisfactory communication is enabled over a wide range. Four substantially square antennas are adjacently arra... | 01/20/2004 |
| 6570543 | Conformal, high-frequency, direction-finding antenna A direction-finding antenna that conforms to flat and semi-flat surfaces is disclosed. It has a low profile in comparison to most existing direction-finding antennas and its surfaces are shaped so that reduced radar reflections and reduced radar cross sec... | 05/27/2003 |
| 6538617 | Two-axis, single output magnetic field sensing antenna A passive, non-multiplexed, two-axis antenna for sensing time-varying magnetic fields of a particular carrier frequency at a second point in space as produced by a electromagnetic field generator located at a first point in space. The antenna has a partic... | 03/25/2003 |
| 6512494 | Multi-resonant, high-impedance electromagnetic surfaces An artificial magnetic conductor is resonant at multiple resonance frequencies. The artificial magnetic conductor is characterized by an effective media model which includes a first layer and a second layer. Each layer has a layer tensor permittivity and ... | 01/28/2003 |
| 6215455 | Armored magnetic field antenna in printed circuit A shielded magnetic-field antenna has at least one turn of a metallic element and metallic tubular shielding positioned around the element. The turn (3a) is produced in a printed circuit on a card made of insulating material (4a). The shielding has two op... | 04/10/2001 |
| 6166637 | Apparatuses for electronic identification of a plurality of passing units and methods of electronic identification of a plurality of passing units In one aspect, the invention encompasses a system for electronic identification of a plurality of units. The system comprises transponders which are connected with respective individual units, and which comprise antennas. The system further comprises an i... | 12/26/2000 |
| 6137447 | Antenna for reader/writer In an antenna 1a for reader/writer of an interrogator in a non-contact data carrier system comprising the interrogator and a transponder, the antenna for reader/writer of the interrogator comprises a transmitting antenna 2 for transmitting a signal to the... | 10/24/2000 |
| 6133886 | Antenna for a wireless communication module An antenna (28) for use in a wireless communication module (10) includes a shield plate (40), an antenna loop element (42), and a transmission line element (44). The wireless communication module (10) also includes a receiver (37) having a circuit board (... | 10/17/2000 |
| 5945958 | Loop antenna An improved loop antenna (10) comprises first (12) and second (16) conductive loops. Each of the first and second conductive loops has a discontinuity (14, 18). The first and second conductive loops (12, 16) are arranged substantially concentrically to fo... | 08/31/1999 |
| 5940043 | Unidirectional field antenna for identification system An antenna system for use in detecting an information tag in an interrogation zone comprising a first coil for generating a first field in an interrogation zone, a second coil that is larger than said first coil and positioned proximate the first coil for... | 08/17/1999 |
| 5825335 | Sheet antenna apparatus A sheet antenna apparatus capable of favorably receiving vertically polarized electromagnetic waves is provided which includes an antenna element 11 comprising a main antenna portion 15 having a vertical segment 19, a pair of upper and lower lateral segme... | 10/20/1998 |
| 5691731 | Closed slot antenna having outer and inner magnetic loops An RF identification system having an interrogator operable to send RF interrogations to a transponder and to receive RF responses from the transponder. The interrogator is in electrical communication with a closed slot antenna. The closed slot antenna is... | 11/25/1997 |
| 5661402 | Sealed modular downhole antenna A sealed, modular downhole antenna for measuring electrical characteristics of wellbore fluids and formations. An antenna includes a thin-walled curved metal tube, which houses coil of a length of conductive wire. The wire may be insulated by an insulatin... | 08/26/1997 |
| 5568162 | GPS navigation and differential-correction beacon antenna combination An antenna system comprises a stack of elements that include a GPS patch antenna on a groundplane with an associated low-noise amplifier (LNA), a first Faraday shield of flat ribbon cable covering a first ferrite rod magnetic field antenna, a second ferri... | 10/22/1996 |
| 5485165 | Broadband high efficiency full wave open coaxial stub loop antenna A broadband, high-efficiency loop radiator is characterized by a coaxial loop one wavelength in circumference with a continuous center conductor fed through a coaxial T feed and a discontinuity of the outer shield next to the feed point of 50 ohms input i... | 01/16/1996 |
| 5363113 | Electromagnetic antenna and excitation antenna provided with such electromagnetic antenna for a nuclear magnetic resonance apparatus By associating an open conductive shield with a radiating loop, it is possible to limit transmission of the electric field for the benefit of transmission of a magnetic field alone. It is shown in particular in the nuclear magnetic resonance imaging field... | 11/08/1994 |
| 5345222 | Detection apparatus for security systems An electronic article surveillance system is provided that comprises a core-wound drive coil which produces an AC magnetic interrogation field, and a detection coil provided on one side with at least one element of a screening material, which detection co... | 09/06/1994 |
