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Extra info for Engineer's Mini Notebook: Communications Projects (Radio Shack cat. No. 276-5015 A)
And they move in the air, carrying the power. 3. Conjugate impedance matching The impedance matching condition has been addressed very essential regarding the quality of the RFID system with the power received by the tag and reader. In Figure 2, a simplified transmission line models the linkage of the reader antenna and the tag with the chip. The transmission line circuit is connected to the input impedance of the reader antenna and the tag, and it is ideal for the overall circuit to be matched to both the source and load.
Kivikoski M. (2006). Radio frequency technology for automated manufacturing and logistics control. Part 2: RFID antenna utilization in industrial applications, The International Journal of Advanced Manufacturing Technology, Vol. 31, No. 1-2, pp. 116-124. Qing X. & Yang N. (2004a). A folded dipole antenna for RFID, IEEE Antennas and Propagation Society International Symposium, Vol. 1, pp. 97-100, June 20-25, 2004. Qing X. & Yang N. (2004b). 45GHz circularly polarized RFID reader antenna, The Nine International Conference on Communication Systems (ICCS 2004), pp.
20 Development and Implementation of RFID Technology more serious. Ordinarily, the impedance of the antenna prototype designed for the tag is 50 ohm or 75 ohm, while the chip impedance may be a random value, or vary with frequency, and have a difference when the driving power is changed. It is extremely crucial to achieve suitable impedance match between the antenna and the chip. New integrated circuit chip design and development need large investment and long research period, however, designing antenna to match the existing chip is more convenient and practical.