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RFID system

A technology of radio frequency identification tags and identification information, which is applied in the direction of instruments, inductive record carriers, computer components, etc., can solve the problems of signal distortion, interrupt tag identification, drop, etc., and achieve the realization of tag structure, reliability and rapid tag identification Effect

Inactive Publication Date: 2009-01-14
LG INNOTEK CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, generating power from the ASK signal takes a predetermined time, which interrupts identification of a large number of tags in a short period of time
[0011] Also, when a large number of tags are present and the distance between the reader and the tags is long or exceeds the beamwidth of the antenna, a voltage drop will occur and tag operation may not occur
[0012] Simultaneous conversion and demodulation of the ASK signal may cause signal distortion

Method used

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Embodiment Construction

[0039] An RFID system and an RFID tag according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0040] The RFID system according to the present invention provides reliable tag identification even when a plurality of tags are concentrated in a predetermined space such as a container. The present invention can make the error generation probability not exceed 10 when identifying at least one tag -6 .

[0041] Passive tags are exemplified as tags of the present invention. Passive tags have a very simple structure and can be produced at economical costs. Furthermore, the present invention can also be applied to active tags with a pre-charged internal power supply.

[0042] The present invention provides a new idea of ​​RFID system using OFDM technology.

[0043] [Time Separation Technology]

[0044] OFDM signals provide a solution to the problems of related art RFID systems.

[0045] First, OFDM technology can con...

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PUM

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Abstract

A radio frequency identification tag includes an antenna terminal, a memory, a D / A converter, a clock extractor, a frequency synthesizer, a radio frequency UP converter, and a power unit. An energy pumping signal is received and tag identification information is transmitted through the antenna terminal. The tag identification information is stored in the memory. The D / A converter converts the tag identification information into an analog signal in response to an information request signal included in the energy pumping signal. The clock extractor extracts a clock signal from the energy pumping signal. The frequency synthesizer is operated according to the clock signal of the clock extractor, and generates a frequency. The radio frequency up converter up- converts a signal output from the D / A converter, and allows the up-converted signal to be transmitted through the antenna terminal. The power unit supplies internal power.

Description

technical field [0001] The present invention relates to radio frequency identification (RFID) readers and RFID tags. Background technique [0002] Recently, radio frequency identification (RFID) systems have been widely used. [0003] The RFID system includes a tag and a reader, wherein the tag includes detailed product information and is attached to the product, and the reader is used to read the information of the tag. [0004] Related art RFID systems are designed in the framework of standards based on one of two algorithms, "slotted aloha" and "binary tree", proposed by ISO / IEC and EPCglobal. [0005] The standard based on the slotted aloha algorithm has a low bit rate and cannot individually identify multiple tags with a high recognition rate. [0006] Standards based on binary tree algorithms provide improved performance allowing simultaneous recognition of multiple tags at low bit rates. Theoretically, the standard based on the binary tree algorithm can identify 10...

Claims

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Application Information

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IPC IPC(8): G06K17/00
CPCG06K7/0008G06K7/10039G06K7/10069
Inventor 金南伦李龙熙曹永彬崔在渊谢盖耶夫·谢尔盖别洛诺日金·亚历山大
Owner LG INNOTEK CO LTD
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