Advanced RFID Design and Applns by S. Preradovic

By S. Preradovic

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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+ . Then Equation 43 becomes 20 Advanced Radio Frequency Identification Design and Applications Equation 45.

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. 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.

The transponder IC design, the tag antenna design, the reader antenna design, and the deployed environment, in an RFID system affects the operating range of that system. Among all of them, there are a few factors which we believe play a significant role. (i) The selection of the parameter θ, the magnitude squared of which establishes the fraction of the available tag antenna power that is not delivered to the tag chip is one of the keys to lengthening the operating range, since it governs how much power would be delivered to power the chip and how much will be backscattered to sense the reader.

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