access icon free Compact folded square-loop antenna for reading near-field RFID tags in blood sample tracking system

A highly compact (25 × 25 × 0.8 mm3) dual-band folded square-loop antenna is proposed for reading near-field RF identification (RFID) tags. The antenna has a strong and uniform magnetic field in the near-field zone of the square loop. The side length of the square loop (∼λ/16) generates resonant frequencies in two conventional modes (0.5λ and 1.0λ). Experimental interrogation of a small RFID button tag attached to a blood sample collection tube showed that the antenna has a small interrogation zone (15 × 15 mm2), which avoids unnecessary interrogation. Experiments also showed that with an input power of 25 dBm, the antenna can tag at a distance of up to 40 mm, which confirmed its suitability for reading button-type RFID tags attached to blood sample collection tubes and other specimen containers.

Inspec keywords: loop antennas; UHF antennas; biomedical communication; radiofrequency identification

Other keywords: interrogation zone; compact dual-band folded square-loop antenna; specimen containers; resonant frequencies; blood sample tracking system; blood sample collection tubes; near-field RF identification tag reading; button-type RFID tag reading; near-field RFID tag reading

Subjects: Single antennas; RFID systems; Biomedical communication

References

    1. 1)
    2. 2)
      • 1. Nikitin, P.V., Rao, K.V.S., Lazar, S.: ‘An overview of near-field UHF RFID’. IEEE Int. Conf. RFID, TX, USA, March 2007, pp. 167174.
    3. 3)
    4. 4)
    5. 5)
      • 8. Li, X., Sun, Z., Liu, Y.: ‘Double-layer folded loop antenna for UHF near-field RFID applications’. IEEE Asia-Pacific Conf. Antennas and Propagation, Singapore, 27–29 August 2012, pp. 8182.
    6. 6)
    7. 7)
      • 9. Chang, M.J., Chen, H.M.: ‘Compact near-field folded loop antenna for UHF RFID handheld reader’. Int. Symp. Antennas and Propagation, Taiwan, 2–5 December 2014, pp. 107108.
    8. 8)
    9. 9)
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