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E. s = 1 . The power transmission coefficient (Rao, Nikitin & Lam, 2005b) can also be defined as τ , and Pc = Paτ , where Pa stands for the power from reader caught by tag antenna, Pc the power transmitted from the tag antenna to the tag chip. It follows from Fig. 3 that τ= 4 Rc Ra Za + Zc 2 ,0 ≤τ ≤1 2 τ + s =1 Let xa = Xa Rc , ra = Ra Rc , Qc = Xc Rc (22) (23) , then equation of the circle with constant power transmission coefficient is expressed as follows. 2 4 [ra − ( − 1)]2 + [ xa + Qc ]2 = 2 (1 − τ ) τ τ (24) From equation (24), the impedance chart with the constant power transmission coefficient is draw, as shown in Fig.

9, pp. 2721-2725. , Sydänheimo L. & 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.

16. Radiation patterns of the tag antenna for chip 2 Similar tag antenna can also be designed based on the EBG structure (Abedin & Ali, 2005a, 2005b, 2006; Yang & Rahmat-Samii, 2003) like the tag antenna shown in Fig. 12. The EBG structure is attached to the surface of the metallic object, and the tag dipole antenna like the active dipole in Fig. 13 is placed on the EBG structure formed by 5×7 elements, as shown in Fig. 17. This structure is analyzed at frequency 915MHz in the UHF band, and its radiation patterns are calculated, which are shown in Fig.

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