Column Control DTX

Fluorescent Lighting Interference on Passive UHF RFID Systems

Application Notes

In passive radio frequency identification (RFID) systems an RFID reader transmits an RF signal to the RFID tag, which consists of an antenna and an integrated circuit chip. The chip is powered by converting the transmitted RF signal into DC power and communication from the tag to reader occurs in the form of RF backscatter. In this case, the chip responds by varying the load impedance of the tag antenna at the data rate of the system. Changes in the load result in changes in the reflection properties from this antenna. The reader then recognizes these small changes as tag data and recovers the tag ID.

 

However, as the reader is transmitting a continuous wave (CW) signal during the backscatter operation, other changes in the surrounding environment could potentially modulate the carrier. Electronic ballast-driven fluorescent lamps (EBFL) may unintentionally modulate the RF signal and affect the reception of backscatter signal from the UHF RFID tag.

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Column Control DTX