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RFID Essentials
book

RFID Essentials

by Bill Glover, Himanshu Bhatt
January 2006
Intermediate to advanced content levelIntermediate to advanced
278 pages
12h 2m
English
O'Reilly Media, Inc.
Content preview from RFID Essentials
218 CHAPTER ELEVEN
One of the challenges of dealing with this growing wealth of information is building sys-
tems and applications that are capable not only of recording the presence of something
and, perhaps, its temperature today, but also of understanding new sensors that may be
added in the future. Abstractions around events, which we described along with the ALE
specification in Chapter 7, are specifically designed to simplify support for a wide variety
of sensors by representing the data from any of them as messages about events submitted
in a standardized format and following a common, flexible protocol.
More Active Tags
Although the current wave of RFID adoption has been focused largely on passive tags, this
is not likely to remain the case if the cost of active tags drops sufficiently. Advances in the
production of chips, antennas, and batteries are steadily reducing the cost of active tags.
The EPC road map includes Class IV and Class V tags and assumes they will be active. Real
Time Location Systems (RTLSs) can use RF tags, among other technologies, to perform
(with a few antennas and some triangulation) tasks that would require a large number of
antennas for passive tags. For now, the cost of active tags offsets their tremendous flexibil-
ity, with the most expensive component being the batteries. Printable, biodegradable bat-
teries are a particularly promising technology already ...
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Publisher Resources

ISBN: 0596009445Catalog PageErrata