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![(a) RFID system block diagram [4], (b) passive RFID tag block diagram](https://i2.wp.com/www.researchgate.net/profile/Mohammadali-Forouzandeh/publication/283029931/figure/fig1/AS:573534453473286@1513752677454/a-RFID-system-block-diagram-4-b-passive-RFID-tag-block-diagram-4.png)