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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.

A) (b) Fig. 29. The simulated Radiation Pattern. (a) 2D, (b) 3D. One can see from the Fig. 57 dBi). Table9 summarizes the simulated results of the proposed fractal loop antenna compared with the fractal loop antenna published in (Salama and Quboa, 2008b). 48 Advanced Radio Frequency Identification Design and Applications Antenna type Return Loss (dB) BW (MHz) Impedance (Ω) eff. 122 Table 9. Simulated characteristics of the designed fractal loop antenna. e. the same substrate parameters), and as a result longer read range is obtained which is the most important factor in designing RFID tags.

From Fig. 6) dB given in Table 7 for (S3-60°). 42 Advanced Radio Frequency Identification Design and Applications (a) Frequency (MHz) (b) Frequency (MHz) Fig. 20. Measured RL for the fabricated antenna: (a) S3-45° antenna, (b) S3-60° antenna. It is clear from Fig. 86) MHz for (S3-45) and (862)MHz for (S3-60) when compared with the simulated resonant frequency at (900) MHz. 1 while in practice it may be slightly different or matching was not perfect. 2 Fractal loop antennas In this section, the design and performance of three fractal loop antennas for passive UHF RFID tags at 900 MHz will be investigated.

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