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Harmonic radio frequency identification system

A radio frequency identification system and harmonic technology, applied in the field of automatic identification, can solve problems such as limiting the receiving sensitivity of readers, achieve the effects of improving sensitivity, increasing working speed, and reducing restrictions

Inactive Publication Date: 2013-07-10
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional radio frequency identification system, the backscattered carrier of the tag is the same frequency as the carrier transmitted by the reader, and the self-interference and multi-path interference of the reader are very serious, which limits the improvement of the receiving sensitivity of the reader

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0029] In order to describe the content of the present invention in more detail, the uplink carrier is taken as the second harmonic of the downlink carrier as an example. Those skilled in the art know that this is just an example, not intended to limit the scope of the present invention.

[0030] Harmonic RFID system consists of PC terminal, reader, tag and antenna, as attached image 3 shown. PC terminal is responsible for data processing and label management;

[0031] The reader transmits a carrier frequency of , the receiving carrier frequency is 2 , due to the different frequency of sending and receiving, the sensitivity of the reader can be made very high;

[0032] The workflow of radio frequency identification system of the present invention is as follows:

[0033] (1) The frequency the reader transmits to the tag is The carrier, the tag rectifies the radio frequency signal to obtain the energy required by the tag and stores it;

[0034] (2) The frequency the r...

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PUM

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Abstract

The invention belongs to the technical field of automatic identification and in particular relates to a radio frequency identification system. The radio frequency identification system consists of a PC (Personal Computer) terminal, a reader, a reader antenna, a label antenna and a label chip, wherein the eigenfrequencies of a receiving module and a transmitting module of the reader are different, the transmitting carrier frequency of the reader is set as f0, and the backscatter carrier frequency of a label is set as F(sum0), wherein F indicates a certain function relationship. The transmitting carrier of the reader is subjected to simple transformation by using the label to obtain carriers with different frequencies so as to carry out backscatter modulation. According to the harmonic radio frequency identification system, self-interference and multipath interference of the radio frequency identification system can be greatly reduced, and therefore the sensitivity of the reader and the radio frequency identification system is improved.

Description

technical field [0001] The invention belongs to the technical field of automatic identification, and in particular relates to a harmonic radio frequency identification system. Background technique [0002] Radio frequency identification technology, commonly known as electronic tags, is a communication technology that uses radio signals to identify specific targets and read and write related data. Radio frequency identification has the advantages of low cost, non-contact, fast communication, and good encryption performance, and has been widely used in logistics, warehousing, charging, access control, data entry and other fields. [0003] A typical radio frequency identification system consists of a PC terminal, a reader and a tag. The information and energy are transmitted wirelessly between the reader and the tag through an antenna. The reader emits electromagnetic waves with modulated data to the tag, and the tag returns the signal through a certain reflection mechanism af...

Claims

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Application Information

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IPC IPC(8): G06K7/00
CPCG06K19/0723
Inventor 陈勇闵昊闫娜谈熙
Owner FUDAN UNIV
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