[특허]Applique nodes for performance and functionality enhancement in radio frequency identification systems

[미국특허] Applique nodes for performance and functionality enhancement in radio frequency identification systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04Q-005/22
출원번호	US-0407383 (2009-03-19)
등록번호	US-8217760 (2012-07-10)
발명자 / 주소	Wild, Ben J. Madhow, Upamanyu Ramchandran, Kannan Barton, Robert Tkachenko, Artem
출원인 / 주소	Checkpoint Systems, Inc.
대리인 / 주소	Caesar, Rivise, Bernstein, Cohen & Pokotilow, Ltd.
인용정보	피인용 횟수 : 3 인용 특허 : 28

초록 ▼

In an RFID system with existing reader and tags communicating with each other, appliqués derive information by listening to this communication to yield significant performance benefits, while not affecting the communication between the existing nodes. For example, an appliqué capable of receiving beamforming can estimate the angle of arrival of the signal emitted by a tag, thereby providing information that can be used to localize the tag. An appliqué may be connected to an existing reader by means of an existing port, such as to an antenna port or to an Ethernet port. The information from appliqués can be integrated with that obtained from existing nodes at either the appliqués, or further up the hierarchy in middleware.

대표청구항 ▼

1. An appliqué for use in an RFID system, said appliqué comprising a smart antenna having a transmit antenna and a plurality of receive antennas in communication with an antenna port of a RFID reader, the smart antenna including a plurality of matching demodulators, each matching demodulator attached to one of the receive antennas to demodulate a RF signal received by the attached receive antenna from an RFID tag, a plurality of matching a/d converters, each matching a/d converter attached to one of the matching demodulators and converting the demodulated RF signals to digital sample signals, and a digital signal processor for calculating an angle of arrival of the RF signal and locating the position of the RFID tag based on the digital sample signals, for conveying to said RFID reader. 2. The appliqué as recited in claim 1, further comprising a directional coupler connected to the matching demodulators, the directional coupler capturing sine wave energy from the RFID reader and directing the energy to the matching demodulators. 3. The appliqué as recited in claim 2, further comprising an envelope detector connected to the directional coupler and to the matching demodulators for demodulating a signal from the reader. 4. A method for locating the position of an RFID tag, comprising: (a) receiving a backscatter signal from the RFID tag by a plurality of antennas of an appliqué in communication with an antenna port of a RFID reader;(b) demodulating the received backscatter signal;(c) converting the demodulated backscatter signal into digital sample signals;(d) reading the digital sample signals;(e) calculating an angle of arrival of the backscatter signal received by the appliqué based on the digital sample signals; and(f) conveying said calculated angle of arrival to said RFID reader. 5. The method of claim 4, further comprising reading a backscatter signal from the RFID tag by a RFID reader, the reading of the backscatter signal by the RFID reader being in addition to the reading of the digital sample signals of step (d). 6. The method of claim 4, further comprising transmitting an RF signal from the RFID reader of a location request and wherein said RFID tag does not respond to the RF signal, reading the RF signal by the appliqué, simulating a backscatter response with an identification and location estimate of the RFID tag at the appliqué, and reading the simulated backscatter response at the RFID reader.

이 특허에 인용된 특허 (28) 인용/피인용 타임라인 분석

Okada Tomoyuki (Palatine IL) Baranowski Robert (Crystal Lake IL), Adaptive radio receiver controller method and apparatus.
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Goff, Edward D.; Gonzalez, Bernard A.; Piotrowski, Chester; Tsai, Ching-Long, Application for a radio frequency identification system.
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Laubach Mark ; Baran Paul, CATV network and cable modem system having a wireless return path.
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Schilling Donald L. (Sands Point NY), CDMA/TDMA spread-spectrum communications system and method.
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Ichiyoshi Osamu (Tokyo JPX), Earth station capable of effectively using a frequency band of a satellite.
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Mallinckrodt Albert J. (14141 Stratton Way Santa Ana CA 92705-3299), Integrated cellular communications system.
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Baran Paul (Atherton CA), Method and apparatus for adapting an electrostatic copier machine to a plain paper facsimile transceiver.
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Zarount Alfred (Middletown NJ), Method and apparatus for apportioning call charges.
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Zehavi Ephraim (San Diego CA), Method and apparatus for bifurcating signal transmission over in-phase and quadrature phase spread spectrum communicatio.
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Parish David M. ; Farzaneh Farhad ; Barratt Craig H., Method and apparatus for calibrating radio frequency base stations using antenna arrays.
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Hane Bengt (Johanneshov SEX), Method for position-finding and apparatus herefor.
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Sato Toshifumi (Tokyo JPX), Mobile communication system capable of transmitting and receiving a radio signal obtained by TDMA and CDMA without inter.
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Collinson,Donald L., Mutual coupling method for calibrating a phased array.
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Francis, Robert C.; McGee, James P.; Sainati, Robert A.; Sheehan, Jr., Richard L.; Tong, Sai-Kit K., Object tracking and management system and method using radio-frequency identification tags.
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McTamaney, Louis S., Path following using bounded beacon-aided inertial navigation.
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Sikina Thomas V. ; Bedigian Oscar J. ; Schuss Jack J., Phased array antenna calibration system and method using array clusters.
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Ali Irfan (Niskayuna NY) Hershey John E. (Ballston Lake NY) Hladik Stephen M. (Albany NY) Hassan Amer A. (Cary NC) Channakeshu Sandeep (Cary NC) Koilpillai Ravinder D. (Cary NC) Welles ; II Kenneth B, Protocol and mechanism for primary and mutter mode communication for asset tracking.
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Urkowitz,Harry, Radar polarization calibration and correction.
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Redden James P. (Mesa AZ) Terris David (Phoenix AZ) Krutz Michael W. (Chandler AZ), Radio channel access control.
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Ferrante,John G., Radio frequency ID coding for identifying multiple items of the same type.
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Kuramoto, Katsuyuki; Fukui, Tomoyasu, Radio-frequency receiver device.
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Taylor Desmond P. (Hamilton CAX), Satellite communication network.
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Gilhousen Klein S. (San Diego CA) Jacobs Irwin M. (La Jolla CA) Weaver ; Jr. Lindsay A. (San Diego CA), Spread spectrum multiple access communication system using satellite or terrestrial repeaters.
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Taylor Desmond P. (Hamilton CAX), Spread spectrum system with random code retransmission.
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Assal Francois T. (Bethesda MD) Evans John V. (Gaithersburg MD) Mahle Christoph E. (Washington DC) Zaghloul Amir I. (Bethesda MD) Gupta Ramesh K. (Rockville MD), Switch matrix including both B switching elements and crossbar switch matrices.
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Mangulis Visvaldis (East Brunswick Township ; Middlesex County NJ), System and method employing two hop spread spectrum signal transmissions between small earth stations via a satellite an.
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Dent Paul W. (Stehag SEX), TDMA/FDMA/CDMA hybrid radio access methods.
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Horstein Michael (Los Angeles CA) Ho Hau H. (Huntington Beach CA), User paging for mobile satellite communications.
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이 특허를 인용한 특허 (3) 인용/피인용 타임라인 분석

Mutz, Matthieu; Mutz, Stéphane, Device and method for location of an RFID transmitter.
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Aditya, Sundar; Behairy, Hatim M.; Molisch, Andreas F., Remote localization and radio-frequency identification using a combination of structural and antenna modes scattering responses.
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Freedman, Jeffrey; Markley, Scott Conrad; Halvorson, Erik; Berman, Arnold, Satellite beamforming.
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[미국특허] Applique nodes for performance and functionality enhancement in radio frequency identification systems 원문보기