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A compact loop antenna with parasitic split ring for UHF RFID application
Author(s)
Date Issued
May 27, 2013
Type
Conference Paper
Abstract
This paper presents a compact loop antenna with parasitic split ring for the reader of the UHF RFID application. The proposed antenna is made up of the rectangular loop structure (feeding element) and the parasitic split ring to reduce the overall antenna dimension. It is found that the size can be decreased by 50% of the typical single loop antenna. The simulation is carried out by using CST Microwave Studio program based on the Finite Integral Technique (FIT). Furthermore, the antenna parameters are optimized using the Quasi Newton method. The effect of the antenna parameters on the impedance bandwidth are investigated in this paper. The comparison between the simulation and experimental results are also discussed. From the results, the antenna has the S11 less than -10 dB along the bandwidth of 12MHz (1.6%). It can be operated in UHF RFID system in Thailand with the frequency band from 920MHz to 925 MHz. The omnidirectional beam is obtained with the maximum gain of 1.5 dBi at the center frequency of 922.5 MHz. The antenna is designed on FR4-substrate. The overall size of the proposed antenna is 51mm x 38mm x 0.8mm (0.15λx 0.11λx 0.02̧). It is easily embedded inside handheld reader. Moreover, the proposed antenna is simple structure, low profile and easy fabrication. Therefore, the compact loop antenna with parasitic split ring can be employed with a handheld UHF RFID reader. Copyright © 2013 The Electromagnetics Academy.
Citation
Progress in Electromagnetics Research Symposium, 219-222, 2013