RADIO FREQUENCY IDENTIFICATION ANTI-COLLISION SYSTEM Russian patent published in 2008 - IPC G01S13/75 G01S13/76 

FIELD: radio technology.

SUBSTANCE: invention pertains to radio technology and can be used for identifying and guarding different objects. The radio frequency identification anti-collision system has a transceiver (scanner) with an antenna, which generates probing radio pulses with carrier frequency of f₀, and ultra-high radio frequency identification marks and a rectifier. The transceiver has a second antenna and a band pass or elimination filter and a switch, all serially connected. The transceiver generates radio pulses at frequencies f_0i, different from the carrier frequency f₀, and triggers them through the first antenna, connected to the transmitter part of the scanner. Each ultra-high radio frequency identification mark is passive. The passive ultra-high radio frequency identification mark has a filter and surface-acoustic-wave delay line, made in the form of an acoustic transmission line. On the working surface of the acoustic transmission line there are input and output interdigital transducers with similar or multiple periods, defined from the condition of acoustic synchronisation, and a controlled interdigital sectional directional coupler, located on different acoustic channels, and overlapping both acoustic channels. The input and output of the filter are electrically connected to the antenna of the passive ultra-high radio frequency identification mark and the input of the rectifier respectively. The output of the rectifier is conductively connected to each gate of the internal channel field effect transistor, the drains of which are electrically connected to sections of the interdigital sectional directional coupler of a delay line on surface-acoustic-wave, and the input and output of interdigital transducers are connected to the antenna for passive radio frequency identification marks and to passive radio frequency identification marks, respectively.

EFFECT: provision for using band pass filters, tuned at different frequencies for controlling the maximum possible number of radio frequency identification marks, located in the scanning zone at the same time.

7 cl, 2 dwg