© The Institution of Engineering and Technology
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.
References
-
-
1)
-
7. Chen, H.M., Lin, Y.F., Chen, C.H., et al: ‘Bandwidth enhancement of compact dual open-loops antenna for UHF near-field RFID reader’, Microw. Opt. Technol. Lett., 2015, 57, pp. 2008–2012 (doi: 10.1002/mop.29254).
-
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. 167–174.
-
3)
-
9. Li, X., Yang, Z.: ‘Dual-printed-dipoles reader antenna for UHF near-field RFID applications’, IEEE Antennas Propag. Lett., 2011, 10, pp. 239–242 (doi: 10.1109/LAWP.2011.2179970).
-
4)
-
10. Qing, X., Goh, C.K., Chen, Z.N.: ‘Segmented loop antenna for UHF near-field RFID applications’, Electron. Lett., 2009, 45, (17), pp. 872–873 (doi: 10.1049/el.2009.0326).
-
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. 81–82.
-
6)
-
11. Cho, C., Lee, C., Ryoo, J., et al: ‘Planar near-field RFID reader antenna for item-level tagging’, IEEE Antennas Wirel. Propag. Lett., 2011, 10, pp. 1100–1103 (doi: 10.1109/LAWP.2011.2169929).
-
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. 107–108.
-
8)
-
5. Qing, X., Goh, C.K., Chen, Z.N.: ‘A broadband UHF near-field RFID antenna’, IEEE Trans. Antennas Propag., 2010, 58, (12), pp. 3829–3838 (doi: 10.1109/TAP.2010.2078432).
-
9)
-
15. Qing, X., Chen, Z.N., Goh, C.K.: ‘UHF near-field RFID reader antenna with capacitive couplers’, IET Electron. Lett., 2010, 46, (24), pp. 1591–1592 (doi: 10.1049/el.2010.2762).
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