A power amplifier (PA) and an energy storage device (such as a capacitor or a battery), in the hardware architecture of conventional passive RFID tags, increase the read range by allowing amplification of the backscatter signal.
This new tag architecture, called Amplified Backscattering via Energy Harvesting (ABEH), we could consider as passive, since the energy storage device is charged by harvesting energy from the RF-signal transmitted by the reader and received by the tag during idle periods.
After all, the harvested and stored energy is then used by the tags to amplify the backscatter
signal one time for another. This architecture is significantly different from active RFID tags where the battery, charged at the time of installation, is used to supply a complete onboard transceiver so that no backscatter modulation is set.
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