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Surface acoustic wave radio frequency electronic tag with large data capacity

A surface acoustic wave and electronic label technology, which is applied to record carriers, instruments, computer parts, etc. used in machines, can solve problems such as waste of space resources, and achieve the effect of structure and design optimization and expansion of coding capacity.

Active Publication Date: 2013-01-09
GUANGDONG CANCHIP TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To a certain extent, it causes a waste of space resources

Method used

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  • Surface acoustic wave radio frequency electronic tag with large data capacity
  • Surface acoustic wave radio frequency electronic tag with large data capacity
  • Surface acoustic wave radio frequency electronic tag with large data capacity

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Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] According to literature 1, the reflection of sound waves of a specific frequency can be achieved by adjusting the width of the reflection grating. For 42°LiTaO 3 In the case of making aluminum metal electrodes, calculate the numerical value of the single-period reflectivity, specifically as figure 1 shown.

[0025] Depend on figure 1 It can be found that at different operating frequencies, the reflectivity varies greatly. In this figure, the relative film thickness is 0.16, and the metallization ratio is 0.5. Therefore, the reflection of sound waves of specific frequencies can be realized by changing the width of the reflection grating.

[0026] like image 3 , the present invention is a surface acoustic wave radio frequency electronic tag with a large data capacity, which mainly includes: a piezoelectric substrate, two transmitting interdigital ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077
Inventor 李红浪程利娜刘久玲何世堂
Owner GUANGDONG CANCHIP TECH CO LTD
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