Problem of interrogation zone synthesis in anticollision Radio Frequency Identification systems

The need for designing anticollision radio frequency identification (RFID) systems appears more often. The typical applications of such systems are concentrated on different economic and public activity in industry, commerce, science and medicine (Internet of things). Operation of passive RFID systems (low or high frequency inductive coupled, ultra high frequency) is characterized by the interrogation zone, which is estimated in any direction of 3D space for group of electronic tags. The comprehensive algorithm of identification of interrogation zone for inductive coupled anticollision RFID system taking into consideration the field, electrical and communication aspects of operation conditions has been partially presented in this paper. The mentioned aspects influence on RFID system reliability, which is characterized by the efficiency coefficient and the probability of identification of the objects in determined interrogation zone. Presented electromagnetic field and electric aspects of operation conditions of identification efficiency in anticollision RFID systems are the part of the algorithm of synthesis of RWD and tag antenna set for the system with inductive coupling. It defines the energy transfer and the conditions of passive tag supply, which expresses the elementary tag parameter defining the interrogation zone - the minimum value of magnetic induction.