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By Stevan Preradovic

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11 which are in good agreement with the simulated results. 5 and rotation angle of θ = 0°. There are three basic parts that form the basis of the Sierpinski gasket, as shown in Fig. 12. The geometric construction of the Sierpinski gasket is simple. It starts with a triangle as an initiator. The initiator is partitioned into three equal parts, each one is a triangle with half size of the original triangle. This is done by removing a triangle from the middle of the original triangle which has vertices in the middle of the original triangle sides to form three equilateral triangles.

25 shows the first iterations P0, P1, and P2 of the proposed fractal curve. P0 P1 P2 Fig. 25. First two iterations of the proposed fractal curves. 46 Advanced Radio Frequency Identification Design and Applications A new fractal loop antenna is designed for passive UHF RFID tags at 900 MHz based on 2nd iteration of the above proposed curve with line width of (1mm). The fractal loop is split into two halves (upper & lower halves) by making a horizontal cut at the centre of the loop as shown in Fig.

The two antennas’ terminals are connected to two lumped ports separately. In HFSS, such ports possess implied transmission line characteristic impedances. These lines could be connected to the ports and those lines allow scattering parameters to be defined. 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.

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