Advanced Radio Frequency Identification Design and by Stevan Preradovic

By Stevan Preradovic

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It is believed that the effective permittivity of the bubble wrap is close to be 1. The relative permittivity of Teflon is usually about 2 with very low losses (Santra and Limaye, 2005; Plumb and MA, 1993). In order to minimise the effects of the Teflon, the Teflon sheet is cut into a much smaller footprint (6mm×8mm) than the tag. Given the low profile structure and small size, it is believed that the insertion of the Teflon sheet will not affect the results much either. The reading range tests were conducted by the equipment introduced before and under Australian UHF RFID regulations which frequency band is from 920MHz to 926MHz and the available source power of the reader generator is set to be 4W EIRP (36dBm).

L (a) (b) (c) Fig. 7. First iteration of: (a) Initiator; (b) Standard Koch curve; (c) Proposed fractal curve generator . Additional iterations are performed by applying the IFS to each segment to obtain the proposed fractal dipole antenna (P3) which is designed based on the 3rd iteration of the proposed fractal curve at a resonant frequency of 900 MHz and 50 Ω reference impedance port as shown in Fig. 8. Fig. 8. The proposed fractal dipole antenna (P3) (Salama and Quboa, 2008a). 36 Advanced Radio Frequency Identification Design and Applications Table 4 summarizes the simulated results of P3 as well as those of the standard Koch fractal dipole antenna (K3-60°).

Hence, Zchip in Equation 61 can be obtained. Typically the threshold power of this chip is -14dBm, but the threshold power is dependent on the manufacturing quality control, the worst could be -11dBm. More details of the chip can be found in the product data sheet (Alien Technology, 2008). 4. 8 (unit mm). The output impedance of this antenna is designed to be approximately conjugate matched to the chip impedance. The chip is installed on the antenna by electrically conductive adhesive transfer tape 23 Operating Range Evaluation of RFID Systems 9703 manufactured by 3M (3M, 2007).

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