Advanced Radio Frequency Identification Design and by Stevan Preradovic

By Stevan Preradovic

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5, in which the reader and chip are connected to the reader antenna and the tag antenna by transmission lines of which the characteristic impedance is Z0 . In Fig. 5, the reader antenna is represented by the two thick lines in the dashed circle for which the input impedance, taking into account the coupling between the antennas, is Zrant , and the tag antenna is represented by the two thin lines in the dashed circle for which the output impedance, taking into account the coupling between the antennas, is Ztant .

They are classified into two categories: 1) Fractal Dipole Antennas; which include Koch fractal curve, Sierpinski Gasket and a proposed fractal curve. 2) Fractal Loop Antennas; which include Koch Loop and some proposed fractal loops. 1 Fractal dipole antennas There are many fractal geometries that can be classified as fractal dipole antennas but in this section we will focus on just some of these published designs due to space limitation. 1 Koch fractal dipole and proposed fractal dipole Firstly, Koch curve will be studied mathematically then we will use it as a fractal dipole antenna.

29, No. 3, pp. 433–437, Mar. 2008. [4] Cole,P. ; Hu, Z. & Ranasinghe, D. (2010). ; Sheng, M. ), Springer, 2010. [5] De Vita, G. & Iannaccone, G. (2005). Design criteria for the RF section of UHF and microwave passive RFID transponders. IEEE Transactions on Microwave Theory and Techniques, Vol. 53, No. 9, pp. 2978–2990, Sept. 2005. [6] Dobkin, D. & Weigand, S. (2005). Environmental effects on RFID tag antennas. IEEE International Microwave Symposium Digest, Vol. 5, No. 1, pp. 247–250, Jun. 2005.

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