12.8 Conclusions
The fundamental principles governing electromagnetic coupling between an interrogator
and its labels in an RFID system have been outlined, and a set of concepts suitable for
describing coupling in the near and far ?¬?elds, using electric ?¬?eld-, magnetic ?¬?eld-, or
electromagnetic ?¬?eld-sensitive antennas, have been de?¬?ned. Some of the properties of
electric ?¬?eld and magnetic ?¬?eld antennas have been derived.
Some important theorems about optimizing antenna sizes and operating frequencies
subject to electromagnetic compatibility regulations have been derived.
References
Brown, G.H. and O.M. Woodward Jr. 1952. Experimentally determined radiation characteristics of
conical and triangular antennas. RCA Review, 13, 425??“452.
Cole, P.H. 2002. A study of factors affecting the design of EPC antennas and readers for supermarket
shelves. http:==www.autoidcenter.org=research=ADE-AUTOID-WH-001.pdf
Eshraghian, K., P.H. Cole, and A.K. Roy. March 1982. Electromagnetic coupling in subharmonic
transponders. Journal of Electrical and Electronics Engineering, Australia, pp. 28??“35.
International Organisation for Standardisation (ISO). 1992. SI units and recommendations for the use
of their multiples and of certain other units. International Standard ISO 1000.
Osborn, J.A. 1945. Demagnetising factors of the general ellipsoid.
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