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UHF near-field RFID reader antenna with capacitive couplers

UHF near-field RFID reader antenna with capacitive couplers

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A segmented loop antenna with capacitive couplers is proposed for ultra-high frequency (UHF) near-field radio frequency identification (RFID) applications, which is capable of generating a strong and uniform magnetic field in a near-field zone even though the perimeter of the loop is comparable to the operating wavelength. As an example, an antenna printed onto an FR4 printed circuit board with an interrogation zone of 154 × 154 mm exhibits good impedance matching and uniform magnetic field distribution over an operating bandwidth of 790–1000 MHz, which is desirable for UHF near-field RFID reader applications.

References

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      • K. Finkenzeller . (2004) RFID Handbook.
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      • Online available: ‘UHF Gen 2 for Item-level Tagging’, at http://www.impinj.com/files/MR_GP_ED-00003-ILT.pdf.
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      • Online available: ‘Item-level visibility in the pharmaceutical supply chain: a comparison of HF and UHF RFID technologies’, at http://www.electrocom.com.au/pdfs/jointPharma-RFID-TIRFID.pdf.
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      • D.M. Dobkin , S.M. Weigand , N. Iye . Segmented magnetic antennas for near-field UHF RFID. Microw. J. , 6
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      • Li, X., Liao, J., Yuan, Y., Yu, D.: `Segmented coupling eye-shape UHF band near field antenna design', IEEE Microwave Asia Pacific Conf., December 2009, Singapore, p. 2401–2404.
    7. 7)
      • Chen, Z.N., Goh, C.K., Qing, X.: `Loop antenna for UHF near-field RFID reader', 4thEuropean Conf. of Antennas and Propagation, April 2010, Barcelona, Spain, p. 1–4.
    8. 8)
      • Qing, X., Goh, C.K., Chen, Z.N.: `A segmented loop antenna for UHF near-field RFID', IEEE Int. Symp. Antennas and Propagation, July 2010, Toronto, Canada, p. 1–4.
    9. 9)
      • IE3D User's Manual, Release 12, Zeland Software Inc., October 2006.
    10. 10)
      • Online available: http://www.impinj.com/products/rfid-reader.aspx.
    11. 11)
      • Online available: ‘Tag Antenna Designs’, at http://www.rfidinfo.jp/whitepaper/379.pdf.
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