SYSTEM OF RADIO-FREQUENCY IDENTIFICATION ON SURFACE ACOUSTIC WAVES Russian patent published in 2009 - IPC G01S13/00 

FIELD: physics.

SUBSTANCE: system of radio frequency identification on surface acoustic waves contains transceiver with an antenna and radio frequency markers on surface acoustic waves, representing delay lines (DL), which have receiving-transmitting inter-digital transducers (IDT), connected to the antenna and reflective receiving-transmitting inter-digital transducers, radio-frequency markers are split into N groups with different central frequencies Fn, inside each of which there is M DL on one and the same central frequency with only one reflecting IDT, situated in different DL at different distances, differing from each other with one and the same value l=τV_SAW>V_SAW - velocity of SAW, the distance between the central frequencies DL, located in different groups are selected equal to ΔF/M, and the bandwidth of each DL is equal to ΔF/(1.5·N), the transceiver carries out periodic scanning of the markers of radio frequency impulses with the width τ and filling frequency equal to Fn consecutively, beginning with the frequency F₁ and ending with the frequency F_N, the minimum distance between the interrogation pulses (scanning period) is equal to 2·M·τ, and the minimum value t is determined from the correlation: τ=(1.5·N)/ΔF, where ΔF - frequency band, obtained for the system.

EFFECT: possibility of simultaneous scanning of several identification devices.

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