tailieunhanh - Current Trends and Challenges in RFID Part 13

Tham khảo tài liệu 'current trends and challenges in rfid part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 350 Current Trends and Challenges in RFID 5. Results The experimental research have been carried out for different RFID elements using the laboratory system which allows to determine single and anticollision identification process for all frequencies in RFID systems with inductive coupling Fig. 9 . Fig. 9. RFID laboratory in the Rzeszów University of Technology a dynamic test stand b static test stand c example of long range read write devices d example of measuring equipment During the search of the interrogation zone of RFID system for a given efficiency of identification ĨỊỈD 1 the appearance of condition AcpR AcpRmax makes a correct identification impossible. In MC calculation the parameter AcpR is calculated on the basis of the total impedance ZR of RWD antennas arrangement 29 taking into consideration influence of functioning tags on this antenna - calculated from the equation 30 . For example the limit phase value was AcpRmax 15o for the Philips HITAG RM 800 read write device working at frequency fo 125 kHz. The technical documentation available on the basis of an agreement reached between the Department and the Philips Semiconductors has been used in the investigations. For the correct energy transfer in the anticollision RFID system with inductive coupling assuming the possibility of using identical tags in automatic identification process the specified value of minimum magnetic induction Bmin will be the parameter that limits tags correct operation area. This parameter should be calculated from the equation 28 for the Application of Monte Carlo Method for Determining the Interrogation Zone in Anticollision Radio Frequency Identification Systems 351 individual single tag construction and the kind of operations executed in its internal memory read write of tags memory . If the value of perpendicular component of magnetic induction vector at point of the location of tag is smaller than his parameter Bmin then the correct functioning of this tag in .