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By Stevan Preradovic

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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. IEEE Journal of Solid-State Circuits, Vol. 38, No. 10, pp.

Table 2 summarizes the dipole parameters with different indentation angles at 50Ω port impedance. Iter. No. Dim. 55 Table 2. Effect of indentation angle on Koch fractal dipole parameters. Another indentation angle search between 20° and 30° is carried out for better matching. 5° indentation angle has almost 50Ω impedance. This modified Koch fractal dipole antenna is shown in Fig. 6. 5°) with the standard Koch fractal dipole (K3-60°) both have resonant frequency of 900 MHz at reference port 50Ω.

Fig. 10. Photograph of the fabricated (P3) antenna (a) (b) Fig. 11. 5°) antenna and (b) (P3) antenna Design and Fabrication of Miniaturized Fractal Antennas for Passive UHF RFID Tags 37 These fractal dipole antennas can be fabricated using printed circuit board (PCB) technology as shown in Fig. 9 and Fig. 10 respectively. A suitable 50 Ω coaxial cable and connector are connected to those fabricated antennas. In order to obtain balanced currents, Bazooka balun may be used (Balanis, 1997). The performance of the fabricated antennas are verified by measurements.

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