Advanced Radio Frequency Identification Design and by Stevan Preradovic

By Stevan Preradovic

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2 Transmitting mode The passive RFID tag work in its transmitting mode as shown in Fig. 3. In transmitting mode, the chip is serving as a source and it is sending out signal thought the RFID antenna. Fig. 3. Equivalent circuit of passive RFID tag in the transmitting mode (Salama, 2008). 32 Advanced Radio Frequency Identification Design and Applications 4. Fractal antennas A fractal is a recursively generated object having a fractional dimension. Many objects, including antennas, can be designed using the recursive nature of fractals.

6. 5°) with the standard Koch fractal dipole (K3-60°) both have resonant frequency of 900 MHz at reference port 50Ω. Fig. 6. 5°). 5° Dim. 14 35 Table 3. 5°) parameters with (K3-60°) at reference port 50Ω. 5°) has better characteristics than the standard Koch fractal dipole (K3-60°) and has longer read range. Another fractal dipole will be investigated here which is the proposed fractal dipole (Salama and Quboa, 2008a). This fractal shape is shown in Fig. 7 which consists of five segments compared with standard Koch curve (60° indentation angle) which consists of four segments, but both have the same effective length.

247–250, Dec. 2006. ; Mallinson, H. & Floerkemeier, C. (2007). Assessing and optimizing the range of UHF RFID to enable real-world pervasive computing applications. Proceedings of the 5th international conference on Pervasive computing, 2007. ; Roy, S. & Philipose, M. (2006). Unobtrusive long-range detection of passive RFID tag motion. IEEE Transactions on Instrumentation and Measurement, Vol. 55, No. 1, pp. 187–196, Feb. 2006. [14] Karthaus, U. & Fischer, M. (2003). 7μW minimum RF input power.

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