The SDLR includes excellent multipath and antenna diversity
performance, resulting in superb tag-reading performance. User-speci?¬?c functions can be
con?¬?gured easily to the performance required for different environments, and only the
98 RFID Handbook: Applications, Technology, Security, and Privacy
software needs to be upgraded rather than a completely new hardware design. By integrating
everything into software, fewer external components are required, which further
reduces the cost. This allows innovative new features and a rapid development cycle.
The SDLR can be part of a large distributed and dynamic system in which each reader is
responsible for the management of its own local population of tags that is changing
dynamically. In such a system, the reader acts as a gateway between the low-cost simple
tags and a very sophisticated distributed information system that can interface to enterprise
software applications.
The fundamental physics of antennas and radio frequency propagation properties at
different frequencies cause devices operating at various bands to have different bene?¬?ts
and functionality trade-offs. Therefore, their use will remain a reality for a foreseeable
future. The SDLR must be designed around this notion as a modular system and be able to
support multiple frequency bands.
Furthermore, there is a need for ?¬‚exibility in RFID design because the speci?¬?cations are
still changing, and even within a single speci?¬?cation, the tags can be asked to reply at
different frequencies.
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