The antennas
are also easily tunable by trimming the size of the inductors. Future work may be used to
evaluate the performance of the antennas against various packaging materials.
Acknowledgment
The authors would like to thank Ms. M.L. Ng and Mr. K.S. Leong for assistance offered in
the construction of prototype tags shown in Figure 4.32.
References
Alien Technologies, RFID tags, ALC-140-xx RFID transponder IC (January 2005). Available at: http:==
www.alientechnology.com=products=r?¬?d_tags.php
Ansoft Corporation Web site (2005, August). Available at: http:==www.ansoft.com.au
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G.H. Brown and O.M. Woodward, Experimentally determined radiation characteristics of conical
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S.-Y. Chen and P. Hsu, CPW-fed folded-slot antenna for 5.8 GHz RFID tags, Electronic Letters, 24,
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D.K. Cheng, Field and Wave Electromagnetics, 2nd ed., New York: Addison-Wesley Publishing, ch. 4,
1989.
R.H. Clarke, D. Twede, J.R. Tazelaar, and K.K. Boyer, Radio frequency identi?¬?cation (RFID) performance:
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Far-Field Tag Antenna Design Methodology 91
P.H. Cole, A study of factors affecting the design of EPC antennas and readers for supermarket
shelves, Auto-ID Center workshop, October 2003.
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