RFID products are mainly divided into two
categories: Active and Passive. Though they both adopt RFID technology, their functionalities
are completely different and have distinct characteristics and capabilities. The
most obvious difference is that active RFID tags have their own power source allowing the tag to continuously send signals to the reader, whereas passive RFID tags have to rely on the RF energy sent from the reader to give a signal. With this distinctive difference, active RFID products can be applied
to wider range of applications and more convenience can be provided to users.
Tracking can only be
performed by active tag because only active tags can actively send out signals
periodically to the reader at a longer distance. Passive tags are required to
be tapped against the reader for reading which could not possibly facilitate
tracking functions. Digital sensors can be added to active tags to perform
environmental control, such as monitoring the temperature and relative humidity
of server rooms. Passive tags which are only a simple, flat circuit could not accommodate
such sophisticated feature.
In some applications,
both active and passive tags can perform the task, but active tags can perform
the task in a better way. For example, in access control and customer
relationship management, passive tag users have to take out the tag for the
reader read, while active tag users can skip this process as the reading
distance for active tags is much longer and reading of tags is not affected by
water and metal.
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