The major disadvantages of a passive RFID tag are:
·
The tag can be read
only at very short distances, typically a few feet at most. This greatly limits
the devices for certain applications.
·
It may not be possible
to include sensors that can use electricity for power.
·
The tag remains
readable for a very long time, even after the product to which the tag is
attached has been sold and is no longer being tracked.
The
advantages of a passive tag are:
·
The tag functions without
a battery; these tags have a useful life of twenty years or more.
·
The tag is typically
much less expensive to manufacture.
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