Advanced RFID Design and Applns by S. Preradovic PDF

By S. Preradovic

ISBN-10: 9533071680

ISBN-13: 9789533071688

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V0 = V0+ + V0− (41a) I0+ (41b) I0 = + I0− The current I0+ and I0− can also be expressed by the voltage in and out of the load port as shown in Equation 42. I0+ = V0+ Z0 I0− = − V0− Z0 (42a) (42b) The ratio of V0− /V0+ is equal to the reflection coefficient looking into the chip impedance from the terminal of the transmission line, which is written as follows. V0− V0+ chip The power received by the chip Pr chip Pr = = sL = Zchip − Z0 Zchip + Z0 (43) is obtained by Equation 44. |V+ + V0− |2 Rchip |V0+ |2 |1 + s L |2 Rchip 1 V |I0 |2 Rchip = | 0 |2 Rchip = 0 = 2 2 Zchip 2| Zchip |2 2| Zchip |2 (44) As mentioned before, the transmission line between the chip and the tag antenna is very short (its length is nearly zero), hence, V0+ = V2− and V0− = V2+ .

The fabricated S3-45° antenna. The performance of the fabricated antennas are verified by measurements. Radiation pattern and gain are measured in anechoic chamber. The measured radiation pattern for (S3-60°) and (S3-45°) fractal dipole antennas are shown in Fig. 19. (a) (b) Fig. 19. Measured radiation pattern for the fabricated antennas, (a) (S3-45°) antenna and (b) (S3-60°) antenna. From Fig. 948) dBi is obtained for (S3-45°). The measured radiation pattern was carried out for φ=0. The Return Loss of the fabricated fractal dipoles is measured using (MOTECH RF-2000) and plotted as shown in Fig.

L. (2008). D. dissertation, The University of Adelaide, Adelaide, Australia. [19] Nikitin, P. & Rao, K. (2006). Performance limitations of passive UHF RFID systems. IEEE Antennas and Propagation Society International Symposium, pp. 1011–1014, Jul. 2006. [20] Nikitin, P. & Rao, K. (2006). Theory and measurement of backscattering from RFID tags. IEEE Antennas and Propagation Magazine, Vol. 48, No. 6, pp. 212–218, Dec. 2006. [21] No author stated. The Cost of RFID Equipment, RFID Journal. com/faq/20 [22] Plumb, R.

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Advanced RFID Design and Applns by S. Preradovic

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