Communication method between reader-writer and electronic tag, reader-writer and electronic tag

Abstract

The invention provides a method for communication between a reader-writer and an electronic tag, the reader-writer and the electronic tag. The method for communication between the reader-writer and the electronic tag specifically comprises the steps: the electronic tag is gradually moved from a nonmetal environment to a metal environment under the condition that the relative positions of the reader-writer and the electronic tag are fixed; the reader-writer continuously transmits electromagnetic waves and receives reflected electromagnetic waves from the electronic tag in the gradual moving process; the reader-writer obtains the impedance matching between a tag chip and a tag antenna by analyzing the intensity of the reflected electromagnetic waves; the reader-writer sends an impedance adjusting instrument to the electronic tag to perform impedance feedback regulation of the tag chip according to the impedance matching; the electronic tag performs impedance regulation of the tag chip according to the impedance adjusting instrument from the reader-writer and sends the reflected electromagnetic waves to the reader-writer after each-time regulation. The method can ensure normal work of the electronic tag in a metal environment, and an environment application range of the electronic tag is widened.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to a communication method between a reader-writer and an electronic tag, a reader-writer and an electronic tag. Background technique [0002] RFID (Radio frequency identification, Radio frequency identification) is a rapidly developing automatic identification technology that has emerged in recent years. It uses radio frequency to conduct non-contact two-way communication to achieve the purpose of identification and exchange data. As a high-tech and information standardization basis for fast, real-time and accurate collection and processing of information, RFID has broad application prospects in various industries such as production, retail, logistics, and transportation. RFID technology has been recognized by the world as one of the top ten important technologies in this century. [0003] A common RFID system is mainly composed of a reader and an electronic ...

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, when the electronic tag is close to a metal object in the use environment, or is attached to the surface of the metal object, the metal often has a reflection effect on the electromagnetic wave, which causes the impedance of the tag antenna to decrease when the electronic tag is in a metal environment. Changes, which lead to changes in the impedance matching between the tag chip and the tag antenna, so that the impedance matching is out of balance; and the impedance matching between the tag chip and the tag antenna often affects the efficiency of the tag chip to obtain energy from the tag antenna, affecting The read-write distance of the electronic tag may even cause the electronic tag to not be recognized by the reader

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