volume | PIER Journals

Abstract

In this paper, a miniature folded dipole is proposed for designing a metal-mountable UHF RFID tag. The proposed tag antenna is low in profile and it has a compact size of 40 mm × 40 mm ×3.1 mm (0.12λ × 0.12λ × 0.009λ). Folding the dipole arms into a two-fold rotational symmetrical style can miniaturize the tag footprint for achieving high compactness. It has been found that the capacitive coupling mechanism between the rotational symmetrical radiating arms is effective in enhancing the vertical radiation, which subsequently improves the achievable read distance in the boresight direction. Also, an incorporated circular loop can provide additional inductance for achieving good impedance matching with the RFID chip. For the proposed tag antenna, a full ground plane is inserted underneath the radiator for isolating it from the backing metal, making the tag tolerant to the metallic platform. The proposed tag antenna is able to achieve a maximum read distance of 7 m at 4 W EIRP when it is tested on metal.

1. Chawla, V. and D. Ha, "An overview of passive RFID," IEEE Commun. Mag., Vol. 45, No. 9, 11-17, Sep. 2007.
doi:10.1109/MCOM.2007.4342873

2. Athauda, T. and N. Karmakar, "Chipped versus chipless RF Identification: A comprehensive review," IEEE Microw. Mag., Vol. 20, No. 9, 47-57, Sep. 2019.
doi:10.1109/MMM.2019.2922118

3. Bjorninen, T., L. Sydanheimo, L. Ukkonen, and Y. Rahmat-Samii, "Advances in antenna designs for UHF RFID tags mountable on conductive items," IEEE Antennas Propag. Mag., Vol. 56, No. 1, 79-103, Feb. 2014.
doi:10.1109/MAP.2014.6821761

4. Lee, Y. H., E. H. Lim, F. L. Bong, and B. K. Chung, "Bowtie-shaped folded patch antenna with split ring resonators for UHF RFID tag design," IEEE Trans. Antennas Propag., Vol. 67, No. 6, 4212-4217, Jun. 2017.
doi:10.1109/TAP.2019.2908268

5. Genovesi, S. and A. Monorchio, "Low-profile three-arm folded dipole antenna for UHF band RFID tags mountable on metallic objects," IEEE Antennas Wirel. Propag. Lett., Vol. 9, 1225-1228, Dec. 2010.
doi:10.1109/LAWP.2010.2103295

6. Cho, C., H. Choo, and I. Park, "Design of planar RFID tag antenna for metallic objects," Electron. Lett., Vol. 44, No. 3, 175-177, Jan. 2008.
doi:10.1049/el:20083712

7. Gao, B. and M. M. F. Yuen, "Passive UHF RFID packaging with electromagnetic band gap (EBG) material for metallic objects tracking," IEEE Trans. Compon. Packaging Manuf. Technol., Vol. 1, No. 8, 1140-1146, Aug. 2011.
doi:10.1109/TCPMT.2011.2157150

8. Park, I. Y. and D. Kim, "Artificial magnetic conductor loaded long-range passive RFID tag antenna mountable on metallic objects," Electron. Lett., Vol. 50, No. 5, 335-336, Feb. 2014.
doi:10.1049/el.2013.2671

9. Marrocco, G., "Gain-optimized self-resonant meander line antennas for RFID applications," IEEE Antennas Wireless Propag. Lett., Vol. 2, 302-305, 2003.
doi:10.1109/LAWP.2003.822198

10. Reed, S., L. Desclos, C. Terret, and S. Toutain, "Patch antenna size reduction by means of inductive slots," Microw. Opt. Technol. Lett., Vol. 29, No. 2, 79-81, Apr. 2001.
doi:10.1002/mop.1089

11. Chen, H. M., S. A. Yeh, Y. F. Lin, S. C. Pan, and S. W. Chang, "High chip reactance matching for ultra-high-frequency radio frequency identification tag antenna design," IET Microw., Antennas Propag., Vol. 6, No. 5, 577-582, Apr. 2012.
doi:10.1049/iet-map.2011.0449

12. Shen, P., W. R. Zhang, L. Huang, D. Y. Jin, and H. Y. Xie, "Improving the quality factor of an RF spiral inductor with non-uniform metal width and non-uniform coil spacing," J. Semicond., Vol. 32, No. 6, 1-5, Jun. 2011.

13. Koo, T. W., D. Kim, J. I. Ryu, H. M. Seo, J. G. Yook, and J. C. Kim, "Design of a label-typed UHF RFID tag antenna for metallic objects," IEEE Antennas Wireless Propag. Lett., Vol. 10, 1010-1014, Aug. 2011.

14. Bong, F. L., E. H. Lim, and F. L. Lo, "Miniaturized dipolar patch antenna with narrow meandered slotline for UHF tag," IEEE Trans. Antennas Propag., Vol. 65, No. 9, 4435-4442, Sep. 2017.
doi:10.1109/TAP.2017.2724074

15. Babar, A. A., T. Bjorninen, V. A. Bhagavati, L. Sydanheimo, P. Kallio, and L. Ukkonen, "Small and flexible metal mountable passive UHF RFID tag on high-dielectric polymer-ceramic composite substrate," IEEE Antennas Wireless Propag. Lett., Vol. 11, 1319-1322, Nov. 2012.

16. Lee, Y. H., E. H. Lim, F. L. Bong, and B. K. Chung, "Folded antipodal dipole for metal-mountable UHF tag design," IEEE Trans. Antennas Propag., Vol. 66, No. 11, 5698-5705, Nov. 2018.
doi:10.1109/TAP.2018.2867050

17. Choi, Y., U. Kim, J. Kim, and J. Choi, "Design of modified folded dipole antenna for UHF RFID tag," Electron. Lett., Vol. 45, No. 8, 387-389, Apr. 2009.
doi:10.1049/el.2009.0198

18. Yang, P. H., Y. Li, L. Jiang, W. C. Chew, and T. T. Ye, "Compact metallic RFID tag antennas with a loop-fed method," IEEE Trans. Antennas Propag., Vol. 59, No. 12, 4454-4462, Dec. 2011.
doi:10.1109/TAP.2011.2165484

19. Monza R6 tag chip datasheet, document IPJ-W1700, Impinj, Inc., Seattle, WA, USA, 2016.

20. Niew, Y. H., K. Y. Lee, E. H. Lim, F. L. Bong, and B. K. Chung, "Patch-loaded semicircular dipolar antenna for metal-mountable UHF RFID tag design," IEEE Trans. Antennas Propag., Vol. 67, No. 7, 4330-4338, Jul. 2019.
doi:10.1109/TAP.2019.2905675

21. ECCOSTOCK PP, Accessed on Jan. 2018, [Online]. Available: http://www.eccosorb.com/Collateral/Documents/English-US/PP.pdf.

22. Rao, K. V. S. and P. V. Nikitin, "Theory and measurement of backscattering from RFID tags," IEEE Antennas Propag. Mag., Vol. 48, No. 6, 212-218, Dec. 2006.
doi:10.1109/MAP.2006.323323

23. Rao, K. V. S., P. V. Nikitin, and S. F. Lam, "Antenna design for UHF RFID tags: A review and a practical application," IEEE Trans. Antennas Propag., Vol. 53, No. 12, 3870-3876, Dec. 2005.
doi:10.1109/TAP.2005.859919

24. Lee, Y. H., E. H. Lim, F. L. Bong, and B. K. Chung, "Compact folded C-shaped antenna for metal-mountable UHF RFID applications," IEEE Trans. Antennas Propag., Vol. 67, No. 2, 765-773, Feb. 2019.
doi:10.1109/TAP.2018.2879853

25. Xu, L., B. J. Hu, and J. Wang, "UHF RFID tag antenna with broadband characteristic," Electron. Lett., Vol. 44, No. 2, 79-80, Jan. 2008.
doi:10.1049/el:20083009

26. Mo, L., H. Zhang, and H. Zhou, "Broadband UHF RFID tag antenna with a pair of U slots mountable on metallic objects," Electron. Lett., Vol. 44, No. 20, 1173-1174, Sep. 2008.
doi:10.1049/el:20089813

27. Son, H. W. and S.-H. Jeong, "Wideband RFID tag antenna for metallic surfaces using proximity-coupled feed," IEEE Antennas Wireless Propag. Lett., Vol. 10, 377-380, Apr. 2011.
doi:10.1109/LAWP.2011.2148151

Dr. Shao-Ming Chiang

Dr. Tong-Lin Lee

Professor Eng Hock Lim

Dr. Pei-Song Chee

Dr. Yong Hong Lee

Dr. Fwee-Leong Bong

Mr. Yeong-Nan Phua

Dr. Boon-Kuan Chung