A Wideband Circular Polarization Antenna for UHF Tags
Keywords:
Axial ratio, circular polarization crossed dipole, RFID, tag antennaAbstract
In this paper, a low profile antenna for UHF Radio Frequency Identification (RFID) Tags with wideband circular polarization (CP) is proposed to solve the polarization mismatch in RFID systems. This antenna consists of two orthogonal dipole with unequal slots for realizing circular polarization radiation and a new matching network. For reducing size, a row-shaped tip loading is used. The measurement result of return loss bandwidth is 40 MHz (895-935 MHz) and 3-dB axial ratio bandwidth is 25 MHz (910-935 MHz). The overall size of antenna has been reduced to (0.19 lambda 0 × 0.19 lambda 0 × 0.005 lambda 0 ) at 915 MHz compared to previous works. Besides, other advantages of this design are wideband impedance matching and CP bandwidth.
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References
K. Finkenzeller, RFID Handbook: Fundamentals and Applications in Contactless Smart Cards and Identification. Wiley, 2003.
W. Choi, J. Kim, J.-H. Bae, and G. Choi, “A small RFID tag antenna using proximity-coupling to identify metallic objects,” IET Microwave and Optical Technology Letters, vol. 50, pp. 2978- 2981, 2008.
Z. Fang, R. Jin, and J. Geng, “Asymmetric dipole antenna suitable for active RFID tags,” IET Electronics Letters, vol. 44, pp. 71-72, 2008.
C. Horng-Dean and T. Yu-Hung, “Low-profile PIFA array antennas for UHF band RFID tags mountable on metallic objects,” IEEE Transactions on Antennas and Propagation, vol. 58, pp. 1087- 1092, 2010.
G. Marrocco, “The art of UHF RFID antenna design: impedance-matching and size-reduction techniques,” IEEE Antennas and Propagation Magazine, vol. 50, pp. 66-79, 2008.
L. Ukkonen, M. Schaffrath, D. W. Engels, L. Sydanheimo, and M. Kivikoski, “Operability of folded microstrip patch-type tag antenna in the UHF RFID bands within 865-928 MHz,” IEEE Antennas and Wireless Propagation Letters, vol. 5, pp. 414-417, 2006.
D. D. Deavours, “A circularly polarized planar antenna modified for passive UHF RFID,” IEEE International Conference on RFID, pp. 265-269, 2009.
C. Chihyun, P. Ikmo, and C. Hosung, “Design of a circularly polarized tag antenna for increased reading range,” IEEE Transactions on Antennas and Propagation, vol. 57, pp. 3418-3422, 2009.
C. Horng-Dean, K. Shang-Huang, C. Sim, and T. Ching-Han, “Coupling-feed circularly polarized RFID tag antenna mountable on metallic surface,” IEEE Transactions on Antennas and Propagation, vol. 60, pp. 2166-2174, 2012.
C. Horng-Dean, C. Sim, and K. Shang-Huang, “Compact broadband dual coupling-feed circularly polarized RFID microstrip tag antenna mountable on metallic surface,” IEEE Transactions on Antennas and Propagation, vol. 60, pp. 5571-5577, 2012.
P. Te, Z. Shuai, and H. Sailing, “Compact RFID tag antenna with circular polarization and embedded feed network for metallic objects,” IEEE Antennas and Wireless Propagation Letters, vol. 13, pp. 1271-1274, 2014.
A. Nesic, I. Radnovic, M. Mikavica, S. Dragas, and M. Marjanovic, “New printed antenna with circular polarization,” 26th European Microwave Conference, pp. 569-573, 1996.
J. D. Kraus, Antennas. McGraw-Hill, 1988.
C. A. Balanis, Antenna Theory, Analysis and Design. Second Edition, New York, John Wiley & Sons Inc., 1997.
