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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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© The Institution of Engineering and Technology
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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.

Inspec keywords: microstrip antennas; UHF antennas; loop antennas; printed circuits; impedance matching; radiofrequency identification

Other keywords: frequency 790 MHz to 1000 MHz; UHF near field RFID reader antenna; impedance matching; ultra high frequency near-field radio frequency identification; capacitive couplers; uniform magnetic field; uniform magnetic field distribution; FR4 printed circuit board; segmented loop antenna

Subjects: Other radio links and systems; Single antennas

References

    1. 1)
      • 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.
    2. 2)
      • Online available: ‘Tag Antenna Designs’, at http://www.rfidinfo.jp/whitepaper/379.pdf.
    3. 3)
      • IE3D User's Manual, Release 12, Zeland Software Inc., October 2006.
    4. 4)
      • K. Finkenzeller . (2004) RFID Handbook.
    5. 5)
      • Online available: http://www.impinj.com/products/rfid-reader.aspx.
    6. 6)
      • 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.
    7. 7)
      • 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.
    8. 8)
      • Online available: ‘UHF Gen 2 for Item-level Tagging’, at http://www.impinj.com/files/MR_GP_ED-00003-ILT.pdf.
    9. 9)
    10. 10)
      • 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.
    11. 11)
      • D.M. Dobkin , S.M. Weigand , N. Iye . Segmented magnetic antennas for near-field UHF RFID. Microw. J. , 6
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