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

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 consists of a receiver-transmitter (scanner) with a primary antenna, which generates probing radio pulses with carrier frequency f₀, and ultra-high radio frequency identification marks, each of which has an antenna, a field effect transistor and a rectifier. The system has a second antenna, serially connected through an antenna switch and a band pass or elimination filter to the input to the receiver part of the scanner. Pulses at frequencies f₀i, are generated, where i=1, 2, 3...N, and N is the number of identified objects, located in the field of the radiation of the scanner at the same time. The pulses are also released through the first antenna, connected to the transmitter part of the scanner. Passive radio frequency identification marks on surface acoustic waves are also used, which have a band pass filter, the input and output of which are electrically connected to the antenna and the input of the rectifier, respectively. The output of the rectifier is conductively connected to the gate of the induced-channel field effect transistor, the source (drain) of which is electrically connected to the antenna, and the drain (source) of the induced-channel field effect transistor is electrically connected to the passive radio frequency identification marks.

EFFECT: simultaneous scanning of several identification system, excluding application of code sequences from marks.

7 cl, 3 dwg