Ultrahigh frequency RFID label reader-writer

Abstract

The invention discloses a UHF RFID label reader-writer, which consists of a control module, a transmission module, a receiving module and a base band processing module. The transmission module is controlled by the control module to provide a carrier signal, process the carrier signal and output the carrier signal to an electronic label. Meanwhile, the invention receives the reflecting signal fed back by the electronic signal and inputs the reflecting signal into the receiving module; the receiving module conducts variable frequency modulation of the reflecting signal fed back by the electronic label under a zero intermediate frequency, so as to realize two-way orthogonal decoding and output two-way base band signal; the base band processing module processes the two-way base band signal and acquires an effective signal that can be processed by the control module; at the same time, the control module receives and processes a two-way low frequency signal and resumes the signal into the original information of the electronic label.

Description

(1) Technical field: [0001] The invention relates to the technical field of radio frequency identification, in particular to an ultra-high frequency RFID tag reader. (two) background technology: [0002] RFID is radio frequency identification technology. It is a non-contact automatic identification technology. Its basic principle is to use radio frequency signals and their spatial coupling and transmission characteristics to realize automatic identification of stationary or moving objects. The radio frequency identification system is generally composed of electronic tags, readers, antennas and hosts. The data information of the target object is stored in the electronic tag. When the system is working, the reader radiates electromagnetic waves through the radio frequency interface. When the electronic tag enters the magnetic field of the reader, it receives the radio frequency signal of the reader, and sends out the product information stored in the chip by virtue of the ene...

AI Technical Summary

Problems solved by technology

Even though some readers on the market use dual-channel signal processing, which can solve the problem of data loss to a certain extent, they all need to add signal digital processing equipment on the basis of the original single-chip microcomputer to achieve this. The structure of the reader becomes complicated, which also increases the production cost of the reader

Images