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Since the effect of multipath interference under indoor environment, some tags cannot be activated without sufficient power in detection area for the passive UHF RFID system, which decreases the tag recognition rate greatly. It is proposed in this paper that the smart antenna is used to overcome multipath interference. The influence of using the smart antenna on the tag received power is analyzed based on multipath channel modeling. Simulation results show that the tag received power tends to be more stable when using the smart antenna than using the traditional single antenna under multipath environment for the passive UHF RFID system, which improves tag recognition rate.

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