ABSTRACT
This chapter addresses the important but difficult problem of determining the location of Radio frequency identification device (RFID) interrogators to maximize read accuracy. Read accuracy at a portal obviously depends on factors such as the quality, reliability, and capabilities of the tags and readers used, as well as the specific application domain. The chapter shows that performance is not only determined by the relative distance of an RFID tag from a reader, but also by the relative orientation of the tag’s antenna with respect to that of the reader. From a probabilistic perspective, read accuracy can be interpreted as the probability that a tag with some random orientation can be read, given its location and the locations and orientations of the reader antennas. The read accuracy with respect to a tag location is the percentage of all orientations of the tag at that particular position that can be powered by at least one reader antenna.
