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A Design of High Gain RFID Label Antenna with Anti-Interference of Mobile Communication Channel

Abstract— This thesis analyzes the IT device assets management environment, and requires that the label antenna of the RFID system shall be metal resistant, anti-absorbing by human body and mobile communication terminal interference resistant. The Chinese UHF RFID channels are 840-845MHz and 920- 925MHz, which is near to the mobile communication CDMA800 and GSM channels, therefore, it will be easily interfered by the mobile communication system, thus increasing the increase of demodulation error rate of the RFID label. Via the analysis on the formation mechanism of mobile communication system to RFID interference, this thesis proposes the UHF RFID label antenna design method which is capable of resisting the interference from the mobile communication terminal, is derived the formula of calculating dielectric substrate thickness h, after repeated experiment with HFSS, the reasonable dielectric substrate relative dielectric constant  r and loss tangenttan values are confirmed, thus designing the RFID label antenna with anti-interference of mobile communication channel and high gain. It is shown from simulation results that the return loss S11 value of RFID channel is less than -10dB, the return loss S11 ofCDMA800 and GSM channels are over -10dB, the voltage standing-wave ratio VSWR value of mobile communication channel is over 2, the voltage standing-wave ratio VSWR value of RFID channel is less than 2, the maximum gain of antenna of the RFID label reaches 7.28dBi and the maximum theoretical reading distance is 17.66m..

Index Terms— RFID label; label antenna; mobile communication interference; anti-interference; UHF channel; high gain

Ouyang Guojun
Guangdong AIB Polytechnic Department of Computer, CHINA

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Cite: Ouyang Guojun, "A Design of High Gain RFID Label Antenna with Anti-Interference of Mobile Communication Channel," Proceedings of 2017 the 7th International Workshop on Computer Science and Engineering, pp. 870-880, Beijing, 25-27 June, 2017.