How does the range of tags and readers affect the way in which RFID works? If I had an RFID tag that could be read from about 3 meters (9.8 feet) away and a reader that could only interrogate tags from a distance of 1 meter (3.3 feet), how would these work?
Read range is affected by many different factors. When solution providers give read ranges, they are not based on a uniform standard, so it would not be possible to offer direct comparisons, nor would it be feasible to create a formula that could indicate that a particular tag would provide, say, a 5-meter (16.4-foot) read range if interrogated by a specific type of reader.
Generally speaking, a tag with a more sensitive chip and/or a well-designed antenna would have a longer read range with any reader, and any reader that was more sensitive in receiving weak signals from tags would offer a longer read range. The best performance can be achieved when you use the two together.
—Mark Roberti, Founder and Editor, RFID Journal
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