S. Preradovic 's Advanced RFID Design and Applns PDF

By S. Preradovic

ISBN-10: 9533071680

ISBN-13: 9789533071688

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2m. dt (mm) Reading range (mm) 3 230 4 350 5 470 6 890 7 1000 8 1140 Table 2. Reading ranges of the self-made tag in proximity to the aluminium plate by experiments. As illustrated by Table 2, the further the tag is away from the aluminium plate, the longer the reading range that is obtained. This phenomenon is easily understood since the metal beside will degrade the performance of the tag antenna. Then, the tag antenna, the aluminum plate behind the tag antenna and the reader antenna 25 Operating Range Evaluation of RFID Systems were built in the simulation tool Ansoft HFSS.

In terms of the characteristic impedance, it can be set in HFSS as an arbitrary complex impedance. But, in reality the characteristic impedance of the transmission line between the reader antenna and the reader is 50Ω. As for the characteristic impedance of the transmission line between the tag antenna and the chip, it can be assumed to be any value, since its length is nearly zero, its characteristic impedance does not really matter. But, in order to get the symmetrical scattering matrix, it is set to be 50Ω as well in the simulation.

The simulated return loss of (S3-45°). 40 Advanced Radio Frequency Identification Design and Applications The simulated radiation pattern with 2D and 3D views at φ=0 and 90° are shown in Fig. 16 for the modified Sierpinski dipole antenna (S3-45°). (a) (b) Fig. 16. The simulated radiation pattern of modified Sierpinski dipole antenna (S3-45°): (a) 2D radiation pattern, (b) 3D radiation pattern. The standard Sierpinski fractal dipole antenna (S3-60°) shown in Fig. 13 and the proposed Sierpinski fractal dipole (S3-45°) shown in Fig.

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Advanced RFID Design and Applns by S. Preradovic


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