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Surface acoustic wave radio frequency identification tag of interdigital transducer / zinc oxide / aluminum (IDT / ZnO / AL) / diamond multilayer membrane structure

A radio frequency identification tag, surface acoustic wave technology, applied in the field of surface acoustic wave radio frequency identification tags, can solve the problems of low sound velocity, small operating frequency of coil antenna, difficult to manufacture and meet, etc.

Inactive Publication Date: 2012-07-11
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] In the past RFID devices based on surface acoustic wave technology, piezoelectric single crystal or piezoelectric ceramic materials are often used as substrate materials. Due to the low electromechanical coupling coefficient or low sound velocity of these materials, it is difficult to prepare modern automatic identification and Requirements for high frequency and large bandwidth required by information transmission systems
However, limited by the size of the tag, general antenna types such as horn antennas, helical antennas, and reflector antennas are not suitable for designing tag antennas.
The coil antenna widely used in IC card tags is a near-field antenna that uses electromagnetic coupling between coils to transmit information. The operating frequency of the coil antenna is small, generally between low frequency and high frequency, and the operating distance is one meter. Therefore, it is not suitable for application on high-frequency surface acoustic wave labels

Method used

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  • Surface acoustic wave radio frequency identification tag of interdigital transducer / zinc oxide / aluminum (IDT / ZnO / AL) / diamond multilayer membrane structure
  • Surface acoustic wave radio frequency identification tag of interdigital transducer / zinc oxide / aluminum (IDT / ZnO / AL) / diamond multilayer membrane structure
  • Surface acoustic wave radio frequency identification tag of interdigital transducer / zinc oxide / aluminum (IDT / ZnO / AL) / diamond multilayer membrane structure

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Embodiment Construction

[0023] One implementation example of the present invention is a 2.45GHz SAW RFID tag. IDT / ZnO / Al / Diamond multilayer film structure single-port resonator is adopted, and the tag antenna is a bent dipole antenna. The matching network is simple, high-frequency surface acoustic wave tags can be realized, and the anti-interference ability is strong.

[0024] The tag resonator of the present invention can also adopt IDT / ZnO / diamond multilayer film structure, ZnO / IDT / diamond multilayer film structure or Al / ZnO / IDT / diamond multilayer film structure, all of which are applicable to the requirements of this patent invention .

[0025] The working principle of the present invention is: when the radio frequency inquiry pulse signal 2 sent by the reader 1 is received by the tag antenna 3, the tag antenna 3 transmits the pulse signal 2 to the fork of the SAW tag single-port resonator directly connected to the tag antenna 3 Refers to the transducer (IDT) 4, which converts the received puls...

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Abstract

The invention discloses a surface acoustic wave radio frequency identification tag of an interdigital transducer / zinc oxide / aluminum (IDT / ZnO / AL) / diamond multilayer membrane structure. The tag comprises a port resonator and a tag antenna. The port resonator uses the multilayer membrane structure and can improve the storage capacity of the tag and increase the combination property of the tag. A novel tag antenna of a meander-line dipole is designed to be matched with the port resonator, and the frequency of the antenna is 2.45 GHz. Compared with traditional antennas, benefits and effective bandwidths are remarkably improved, therefore remote radiation of the tag is achieved.

Description

【Technical Field】 [0001] The present invention is the field of automatic identification technology and information storage transmission technology, especially a sound surface of IDT / ZNO / AL / diamond multi -layer structure applied in modern electronics, acoustic science, microelectronics technology and radar signal processing technologySaw-RFID label. 【Background technique】 [0002] In recent years, the rapid development of mobile communication has been developed by RFID recognition (RFID) and traditional use of integrated circuits (IC) to achieve the use of sound surface wave (SAW) technology in a variety of and unique radio frequency recognition systems.Compared with many unique advantages.The SAW-RFID technology is centered on the sound surface wave device, which overcomes some shortcomings of the traditional radio frequency recognition device with IC chips as the core, and has a passive, long recognition distance, and can recognize high-speed movement objects.The characterist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/077B32B15/04B32B9/04H01Q1/38
Inventor 杨保和孙素娟徐晟李翠平
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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