"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 10, 2017

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Radiofrequency Tags Based on Surface Acoustic Waves in 2.4‑2.483 GHz Frequency Band for Anti-collision Identification System

 

S. G. Suchkov 1, S. A. Nikitov 1,2, S. S. Yankin 1, A. A. Pilovets 1, S. V. Komkov 1, I. A. Shatrova 1, V. A. Nikolaevtsev 1

1 Saratov State University, Astrakhanskaya 83, 410012, Saratov, Russia

2 Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Mokhovaya 11-7, Moscow 125009, Russia

 

The paper is received on October 16, 2017

 

Abstract. This article is dedicated to the problem of anti-collision protection of system of radio frequency identification (RFID) of objects. Such system is based on RFID tags on surface acoustic waves (SAW) and operating in the microwave band. Method of discrete-time coding is realized in this system.

The optimal design of the RFID tags for such system is found in this paper. Calculation of the topology of the metalized structure was carried out by the finite element method. The finite thickness of the electrodes, the SAW energy scattering into the volume and the difference in the material constants between the film structures and the bulk material were taken into account. The geometric parameters of the interdigital transducer fingers and the reflective structure pins and the sizes of the code position are given.

The simulation results and experimental responses of the RFID tag and its transceiver antenna are presented. Frequency S11 and time-domain S(t) responses of anti-collision RFID tags are shown. The frequency response S11 of the antenna and its impedance are shown in the form of Smith chart.

The responses of the anti-collision RFID system based on SAW tags with discrete-time coding in the ISM frequency band (2.4 ‑ 2.483 GHz) were studied theoretically and experimentally. The time-domain simultaneous response S(t) of the seven anti-collision RFID tags is presented.

The possibility of creation of an anti-collision RFID system based on SAW tags which allows us to identify simultaneously up to 100 closely located objects is shown. Such possibility occurs if one uses the discrete-time coding with a single-pulse interrogation mode. The maximal distance of identification of the objects in such system is 20 m.

Key words: radiofrequency identification, surface acoustic wave, collision problem, electron lithography, discrete-time encoding.

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For citation:

S. G. Suchkov, S. A. Nikitov, S. S. Yankin, A. A. Pilovets, S. V. Komkov, I. A. Shatrova, V. A. Nikolaevtsev. Radiofrequency Tags Based on Surface Acoustic Waves in 2.4‑2.483 GHz Frequency Band for Anti-collision Identification System. Zhurnal Radioelektroniki - Journal of Radio Electronics, 2017, No. 10. Available at http://jre.cplire.ru/jre/oct17/14/text.pdf. (In Russian)