![]() Multi-sensor tags including processing capabilities can also be found. ![]() Some examples of these sensor-enabled tags can readily be found in the literature. Sensors, only used in wireless sensor nodes before, are currently making their way towards RFID tags. Tags can now be made thinner, cheaper, often physically flexible, and more energy-efficient. RFID readers are more robust, effective, and energy-efficient. On the other hand, current state-of-the-art N-bit RFID systems serve a broader range of purposes, and the technology is experiencing tremendous advances. The most widespread, yet simple, RFID system is the one-bit EAS (electronic article surveillance) system whose only purpose is to detect the presence/absence of a tagged object in the vicinity of a reader. Non-conventional RFID systems include those that are not exclusively designed for identification purposes, but which also implement other advanced tasks such as location or sensing.
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