Superhigh frequency rediofrequency identical label reader

A radio frequency identification tag and reader technology, applied in the field of non-contact information identification and transmission, can solve the problems of poor anti-interference ability, performance discount, complex structure, etc., and achieve the effects of stable performance, simple structure and low price

Inactive Publication Date: 2006-08-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional reader demodulation circuit usually uses non-coherent envelope detection demodulation or synchronous carrier demodulation technology, the former has poor anti-interference ability and has threshold effect, and the latter needs to use complex same-frequency and same-phase local coherent carrier recovery to generate The circuit has a complex structure, and in practice, due to the influence of the surrounding environment and the mismatched reflected electromagnetic waves of the antenna itself, the performance is also greatly reduced

Method used

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  • Superhigh frequency rediofrequency identical label reader
  • Superhigh frequency rediofrequency identical label reader
  • Superhigh frequency rediofrequency identical label reader

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Embodiment Construction

[0013] Such as figure 1 As shown, the UHF RFID tag reader of the present invention is to connect the antenna 1 with the output port of the circulator 2; port connection, two output ports of the directional coupler 4 are connected with the input port of the logarithmic amplifier 5 and the low noise amplifier 6 respectively, and the input port and the two output ports of the power divider 7 are respectively connected with the output port of the low noise amplifier 6 and the The input ports of the first and second mixers 8 and 9 are connected, and the input and output ports of the first low-pass filter 10 are respectively connected with the output port of the first mixer 8 and the input port of the first analog-to-digital converter 12 Connect, the input port of the second low-pass filter 10, the output port are connected with the output port of the second mixer 8 and the input port of the second analog-to-digital converter 12 respectively, the first analog-to-digital converter 12...

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Abstract

The disclosed reader is composed of antenna, directional coupler, logarithmic amplifier, two pieces of A / D converter, digital signal processor, power amplifier, frequency synthesizer, and serial interface etc. using orthogonal non coherent demodulation technique, the reader receives and detects data information (amplitude modulation or phase modulation) carried by backscattering electromagnetic wave of ID label in radio frequency. Thus, the invention omits complex phase-lock circuit of local oscillation of receiver as well as realizes higher sensitivity of receiver, and longer distance for reading card. Using directional coupler and logarithmic amplifier, the power amplifier carries out automatic power control. Comparing with traditional ID label reader in UHF, the disclosed reader possesses advantages of simple structure, stable performance, and low price.

Description

technical field [0001] The invention relates to a non-contact information identification transmission technology, which is an ultra-high frequency radio frequency identification tag reader. Background technique [0002] Radio frequency identification technology is a non-contact label information identification transmission technology with a wide range of applications and is considered to be one of the most popular industries in the world in recent years. Its equipment consists of two parts: reader and electronic tag. The data information of the described target object (such as commodities, goods, certificates, etc.) is stored in the electronic tag, and the reader communicates with the tag in a non-contact manner and reads the data therein. According to the electromagnetic wave frequency band used, the technology can be divided into three categories: LF (low frequency), HF (high frequency), and UHF (ultra high frequency). Among them, UHF (Ultra High Frequency) technology ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00H04L27/233
Inventor 冉立新范志广
Owner ZHEJIANG UNIV
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