The Physics of RFID: Backscatter, Coupling, and Energy Harvesting

News wire · Source based brief

UHF reader power reaching a passive tag decreases to a quarter when distance is doubled, while power at HF decreases with the cube of the gap. These physical principles of backscatter, inductive coupling, and energy harvesting suggest that increasing transmit power is often an ineffective solution for addressing coverage gaps or challenging environmental interference.

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