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Radio frequency identification reader having a signal canceller and method thereof

A signal cancellation, reader technology, applied in the field of RFID readers, can solve the problems of short read range, passive tags limited storage data capacity, the ability to work well, etc.

Inactive Publication Date: 2009-08-26
TYCO FIRE & SECURITY GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, passive tags typically have a shorter read range than active tags and require a higher powered reader
Passive tags are also limited by their capacity to store data and their ability to function well in electromagnetically noisy environments

Method used

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  • Radio frequency identification reader having a signal canceller and method thereof
  • Radio frequency identification reader having a signal canceller and method thereof
  • Radio frequency identification reader having a signal canceller and method thereof

Examples

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Embodiment Construction

[0019] Referring now to the drawings, wherein like reference numerals designate like elements, in figure 1 A view of an exemplary communication system constructed in accordance with the principles of the present invention is shown in and generally designated "10". Communication system 10 provides one of the embodiments described herein for an electronic identification system. Further, the illustrated communication system 10 is configured for backscatter communication as described in detail below. Other communication protocols may be used in other embodiments.

[0020] The depicted communication system 10 includes at least one electronic wireless telecommunication device 16 and a reader 12 . Radio frequency communication may occur between the remote communication device 16 and the reader 12 for use in identification systems and product monitoring systems as exemplary applications.

[0021] In the embodiments described herein, plurality of devices 16 includes a plurality of r...

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Abstract

The invention provides a method, system and apparatus for generating a cancellation signal in a RFID reader to isolate a transmit section and a receive section of a RFID reader, where the RFID reader generates a local reference signal from a broadcast transmit signal, receives a receive signal from a remote device, determines at least one correction factor, e.g., an amplitude correction factor, to generate a cancellation signal. The method, system and apparatus can further include combining a cancellation signal and a receive signal to minimize or cancel out interference and noise on the receive signal.

Description

technical field [0001] The present invention relates to the field of radio frequency identification ("RFID") circuits and methods, and more particularly to a method and system for an RFID reader having a precision sensing circuit and a signal canceller. Background technique [0002] Radio Frequency Identification systems ("RFID") are used in a wide variety of applications and provide a convenient mechanism for the tracking, identification and authentication of persons or objects. An RFID system typically includes one or more readers (commonly referred to as interrogators) deployed at selected locations in a facility. Readers are typically deployed at desired locations in order to control or receive information about objects or persons bearing or associated with RFID tags (also commonly referred to as markers or transponders). For example, readers can be configured to cover entrances and exits, inventory control points, transaction terminals, and similar locations. Each rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/52G06K7/00H04B1/525
CPCG06K7/0008H04B1/525
Inventor J·F·阿利考特R·F·德沃
Owner TYCO FIRE & SECURITY GMBH
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