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Tag harmonic acquisition method for harmonic radio frequency identification and harmonic radio frequency identification tag

An acquisition method and harmonic technology, applied in the field of automatic identification, can solve the problem of limiting the receiving sensitivity of the reader, and achieve the effects of improving the receiving sensitivity, reducing self-interference and improving the working distance.

Inactive Publication Date: 2016-03-30
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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  • Tag harmonic acquisition method for harmonic radio frequency identification and harmonic radio frequency identification tag
  • Tag harmonic acquisition method for harmonic radio frequency identification and harmonic radio frequency identification tag
  • Tag harmonic acquisition method for harmonic radio frequency identification and harmonic radio frequency identification tag

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Embodiment

[0037] Reference attached Figure 7 , The label adopts a single antenna structure, and the antenna is connected with electrostatic protection, signal adjustment, demodulation circuit, and rectifier. The output of the rectifier is passed through a low-pass filter to obtain DC, and then supplied to the chip through power management; the output of the rectifier is also passed through a high-pass or band-pass filter to obtain harmonic components, which are modulated under baseband control and backscattered by the antenna.

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Abstract

The invention belongs to the technical field of automatic identification, and particularly relates to a label harmonic wave obtaining method for harmonic wave radio frequency identification and a harmonic wave radio frequency identification label. Harmonic waves are generated through a nonlinear device or harmonic waves generated in a nonlinear circuit are extracted from a traditional radio frequency identification label chip and serve as carrier waves used for backscatter modulating. The harmonic waves generated in a prior nonlinear component serve as the carrier waves of a harmonic wave radio frequency identification up link so that the label harmonic wave obtaining method for the harmonic wave radio frequency identification has the advantages that self-infection is as small as that of common harmonic wave radio frequency identification and the harmonic waves are generated without consumption of external power by the label. Therefore, label sensitivity is maintained. According to the label harmonic wave obtaining method for the harmonic wave radio frequency identification and the harmonic wave radio frequency identification label, receiving sensitivity of a reader can be effectively improved and operating distance of a 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 label harmonic acquisition method for harmonic radio frequency identification, and a harmonic radio frequency identification label for realizing the method. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077G06K7/00
Inventor 陈勇闵昊闫娜谈熙
Owner FUDAN UNIV
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