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Segmented loop antenna for UHF near-field RFID applications

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3 Author(s)
Qing, X. ; Inst. for Infocomm Res., Singapore, Singapore ; Goh, C.K. ; Chen, Z.N.

A segmented loop antenna is presented for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications. The proposed segmented configuration makes the current along the loop remain in-phase even though the perimeter of the loop is comparable to the operating wavelength, so that a strong and uniform magnetic field is generated in the region surrounding the antenna. The antenna printed on a FR4 printed circuit board (PCB) with an overall size of 160 times 180 times 0.5 mm achieves good impedance matching and uniform magnetic field distribution over an operating bandwidth of 800-1040 MHz, which is desirable for UHF near-field RFID reader applications.

Published in:

Electronics Letters  (Volume:45 ,  Issue: 17 )