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Active radio frequency identification tag

A technology of radio frequency identification tags and tags, which is applied in the field of realization of active radio frequency identification tags, and can solve problems such as complex structures

Inactive Publication Date: 2009-01-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, due to the complex structure and diversified functional requirements of the active RFID system, the level of research and application needs to be further developed.

Method used

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  • Active radio frequency identification tag

Examples

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Embodiment Construction

[0012] A specific example of implementing the present invention will be described in detail below with reference to FIG. 2 .

[0013] In this implementation example, the energy management circuit is always on. When the communication starts, the reader first sends a signal with a certain strength to the tag. When the energy management circuit detects that the signal meets the communication requirements, the duplexer (6) is switched to the receiving link, and the demodulation circuit is turned on at the same time ( 10) and phase locked loop (11). The demodulation circuit (10) demodulates the useful information carried on the carrier, and hands it over to the baseband signal processing and digital control circuit (12) for operation. The baseband signal processing and digital control circuit (12) performs protocol processing and operations of reading and writing memory according to the instructions sent by the reader. In the process of completing demodulation, baseband protocol ...

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PUM

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Abstract

The invention discloses an active radio frequency identification tag and an implementation method thereof. According to the frequency and phase information of a carrier tracked and received by a phase-locked loop, the tag generates a local oscillation signal with the same frequency and phase of the carrier, and data to be sent is modulated onto the local oscillation signal and transmitted to a reader after power amplification. No crystal oscillator needs to be circumscribed to the tag to be used as a reference datum and the reference datum of the tag comes from the carrier received by tag antenna. A power management circuit is arranged in the tag and controls the on-off of the tag, switches sender-receiver modes and manages power consumption. When the tag is in receiving mode, the phase-locked loop tracks the carrier and when the tag is in sending mode, the local oscillation signal maintains the free oscillation of the state of the moment before.

Description

technical field [0001] The invention relates to the technical field of automatic identification, in particular to a method for realizing an active radio frequency identification tag. Background technique [0002] Automatic identification technology is a general term for various identification technologies including barcode, biometric identification, optical signal identification, smart card and radio frequency identification. Since these technologies have different advantages and disadvantages, they are promoted and applied in different occasions. Among them, radio frequency identification technology has been more and more used in logistics, warehousing, transportation, access control and tickets due to its characteristics of non-contact, small size, low cost and strong confidentiality. [0003] Such as figure 1 As shown, a typical radio frequency identification system consists of a PC (1), a reader (2), a reader antenna (3), a tag antenna (4) and a tag (5). The reader (2...

Claims

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Application Information

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IPC IPC(8): G06K19/07G06K7/00
Inventor 车文毅闵昊谭杰
Owner FUDAN UNIV
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