A novel and simple antenna applicable to active RFID tags is designed. The designed antenna has been skillfully integrated with the active RFID tag circuit. The antenna consists of two parts. One part comprises stacked shorted patches and a ground plane. The other one is an active tag circuit mounted on the bottom of the antenna. By using the offset shorting posts technique, the proposed antenna can achieve an enhanced operating bandwidth with a small size. The measurement results reveal that the antenna has return loss less than -10 dB within the bandwidth of 42 MHz (from 914 MHz to 956 MHz), which totally covers the 5MHz bandwidth from 920MHz to 925 MHz (The band is also allowed for passive RFID) requirement for active RFID in China.
2. Lazaro, A., D. Girbau, and R. Villarino, "Effects of interferences in UHF RFID systems," Progress In Electromagnetics Research, Vol. 98, 425-443, 2009.
doi:10.2528/PIER09101703
3. Hua, R. C. and T. G. Ma, "A printed dipole antenna for ultra high frequency (UHF) radio frequency identification (RFID) handheld reader," IEEE Trans. Antennas Propag., Vol. 55, No. 12, 3742-3745, Dec. 2007.
doi:10.1109/TAP.2007.910521
4. Almanza-Ojeda, D. L., A. Hernandez-Gutierrez, and M. A. Ibarra-Manzano, "Design and implementation of a vehicular access control using RFID," Electronics and Photonics, 2006. MEP 2006. Multiconference, 223-225, 2006.
doi:10.1109/MEP.2006.335668
5. Choi, W., H. W. Son, J. H. Bae, G. Y. Choi, C. S. Pyo, and J. S. Chae, "An RFID tag using a planar inverted-F antenna capable of being stuck to metallic objects," ETRI Journal, Vol. 28, No. 2, Apr. 2006.
doi:10.4218/etrij.06.0205.0058
6. Hirvonen, M., P. Pursula, K. Jaakkola, and K. Laukkanen, "Planar inverted-F antenna for radio frequency identification," Electronic Letters, Vol. 40, No. 14, Jul. 2004.
7. Ryn, H. K., S. Lim, and J. M. Woo, "Design of electrically small, folded monopole antenna using C-shape meander for active 433.92 MHz RFID tag in metallic container application," Electronic Letters, Vol. 44, No. 25, Dec. 2008.
8. Ng, M. L., K. S. Leong, and P. H. Cole, "A small passive UHF RFID tag for metallic item identification," International Technical Conference on Circuits/Systems, Computers and Communications, Vol. 10, No. 13, Chiang Mai, Thailand, Jul. 2006.
9. Waterhouse, R. B., J. T. Rowley, and K. H. Joyner, "Stacked shorted patch antenna," Electronic Letters, Vol. 34, No. 7, 612-614, Apr. 1998.
doi:10.1049/el:19980476
10. Ollikainen, J., M. Fischer, and P. Vainikainen, "Thin dual-resonant stacked shorted patch antenna for mobile communications," Electronic Letters, Vol. 35, No. 6, 437-438, Mar. 1999.
doi:10.1049/el:19990324
11. Mishra, A., P. Singh, N. P. Yadav, J. A. Ansari, and B. R. Vishvakarma, "Compact shorted microstrip patch antenna for dual band operation," Progress In Electromagnetics Research C, Vol. 9, 171-182, 2009.
doi:10.2528/PIERC09071007
12. Fujimoto, T. and K. Tanaka, "Stacked square microstrip antenna with a shorting post for dual band operation in WLAN applications," Proceedings Asia-Pacific Microwave Conference, 1979-1982, 2006.
doi:10.1109/APMC.2006.4429796
13. Lee, G. Y., T. Z. W. Chiou, and K. L. Wong, "BroadBand stacked shorted patch antenna for mobile communications handsets," Proceedings of Asia-Pacific Microwave Conference, 232-235, 2001.
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