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PIERS Online
Vol. 3
No. 7
2007
pp: 951-954A Miniaturized 2.45GHz RFID Tag Antenna Using Planar Impedance TransformerZhiguang Fan, Shan Qiao, Jiangtao Huangfu, and Li-Xin Ran doi:10.2529/PIERS061129100939 Downloads: 2652 Abstract:We proposed a miniaturized 2.45 GHz RFID tag antenna consisting of a dipole radiator and a planar impedance transformer formed on a copper foil layer cladding on 0.5 mm thick FR4 substrate. The impedance transformer comprises two inductively coupled spiral inductor to realize both resistance boosting and inductive compensation for the short dipole radiator to be conjugate-matched to the microchip. The length of the dipole radiator and the side length of the spiral inductor can be easily adjusted to tune the input resistance and inductance of the tag antenna. Finite Difference Time Domain (FDTD) 3D electromagnetic simulation method is utilized to simulate and optimize the tag antenna design. The final design occupies only an area of 33.55 mm×8.54 mm. The omnidirectional radiation pattern, the peak gain value of -0.2 dBi and the radiation efficiency of 0.56 are also achieved, which demonstrate acceptable electrical performance for miniaturized tag design.References:1. Tuttle, J. R., "Traditional and emerging technologies and applications in the radio frequency identification (RFID) industry," Proc. IEEE RFIC Symp., 5-8, Denver, CO, Jun., 1997. 2. Bansal, R., "Coming soon to a Wal-Mart near you," IEEE Antennas Propag. Mag., Vol. 45, 105-106, Dec., 2003. 3. Stockman, H., "Communication by means of reflected power," Proc. IRE, 1196-1204, Oct., 1948. 4. Hirvonen, M., P. Pursula, K. Jaakkola, and K. Laukkanen, "Planar inverted-F antenna for radio frequency identication," Electron. Lett., Vol. 40, 848-850, Jul., 2004. 5. Qing, X. and Y. Ning, "A folded dipole antenna for RFID," Proc. IEEE Antennas and Propagation Soc. Int. Symp., Vol. 1, 97-100, Jun., 2004. 6. Marrocco, G., "Gain-optimized self-resonant meander line antennas for RFID applications," Antennas Wireless Propag. Lett., Vol. 2, No. 21, 302-305, 2003. |
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