Ultrahigh frequency radio frequency identification reader-writer

Abstract

The invention discloses an ultrahigh frequency radio frequency identification reader-writer. The reader-writer at least comprises an antenna, coupling equipment, a receiving module, an emitting module, a digital processing circuit, a local oscillation generating circuit and other circuit modules, wherein the local oscillation generating circuit comprises two phase-locked loop circuits and a frequency mixer; one phase-locked loop circuit outputs a first coarse tuning working frequency band with a relatively large frequency hopping step length; the other phase-locked loop circuit outputs a second fine tuning working frequency band with a relatively small frequency hopping step length; and local oscillation needed by the reader-writer is obtained by frequency conversion on the frequency mixer. Therefore, phase noise of the reader-writer is optimized greatly and the reading and writing sensitivity and reading and writing distance of the reader-writer are enhanced obviously; moreover, information security is enhanced to a certain extent through large-range frequency hopping.

Description

technical field [0001] The invention belongs to the field of radio frequency integrated circuits, and relates to an electronic label reader, in particular to an ultra-high frequency electronic label reader. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology. Its basic principle is to use radio frequency signals and spatial coupling transmission characteristics to automatically identify target objects and obtain relevant information to achieve automatic identification. As a key technology, RFID has attracted more and more people's attention due to its many convenient features and wide application fields. RFID technology has a very broad application prospect. It can be applied to various fields such as warehouse management, identification, transportation, food medical treatment, animal management, access control and anti-theft, and industrial military in logistics and warehousing. It has brought great benefi...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the read-write sensitivity, poor read-write distance and read-write security problems of the above-mentioned prior art, an object of the present invention is to provide a UHF electronic tag reader-writer, which can improve radio frequency identification / The reading and writing sensitivity of the tag reader, on the other hand, improves the regional adaptability of the reader, so that the reader can be universally used in the world, and by realizing a large range of frequency hopping, the security is improved to a certain extent

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