Surface acoustic wave radio frequency electronic tag with large data capacity

Abstract

The invention relates to a surface acoustic wave radio frequency electronic tag with large data capacity, which comprises a piezoelectric substrate, an interdigital transducer and a distribution-type reflection grating array, wherein the interdigital transducer and the distribution-type reflection grating array are arranged on the piezoelectric substrate, and is characterized in that a second interdigital transducer is arraned between propagation paths of a first interdigital transducer and a first distribution-type reflection grating array; a second distribution-type reflection grating arrayis arranged between pulse intervals of encoderless interval of a pulse signal of the first distribution-type reflection grating array, and the second distribution-type reflection grating array is used for forming a surface acoustic wave electronic tag for another frequency together with the second interdigital transducer. On the basis of single interdigital tranducer and single distribution-type reflection grating array structure, the electronic tag utilizes the acoustic wave propagation path and the encoderless interval of the pulse signal to add a second group of another frequency interdigital transducer and reflection grating array; and on the basis that the size of the radio frequency electronic tag is not increased, the coding capacity of the electronic tag is greatly enlarged.

Description

technical field

[0001] The invention belongs to the technical field of surface acoustic waves, in particular to a surface acoustic wave radio frequency electronic tag with large data capacity. Background technique

[0002] The technical development of surface acoustic wave (SAW) electronic tags began in the late 1980s. In view of its advantages of working in the radio frequency band, passive and strong anti-electromagnetic interference, the research of surface acoustic wave tags has become a hot spot.

[0003] like figure 2 As shown, a typical SAW RFID tag system includes a reader (Reader) and a radio frequency tag. The reader transmits a radio frequency query pulse through the antenna, and receives the signal returned by the tag, and obtains the tag information within the reading range after processing. The SAW tag is a one-port device that includes a tag antenna, an interdigital transducer (IDT) and a series of coded reflective grids. The IDT is directly connected with t...

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