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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