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RFID Sourcebook by Sandip Lahiri

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6.4. Disadvantages of RFID and Bar Codes

The major disadvantages of both RFID and bar codes are as follows:

  • Presence of obstacles. A bar code reader cannot read a bar code if there is any obstacle between the reader and the bar code. An RFID reader, depending on its operating frequencies and other factors, such as power and duty cycle, might not be able to read a tag if there are any RF-opaque obstacles, such as metal, or RF-absorbent material, such as water present between the reader and the tag.

  • Presence of moisture. For bar code readers, the light beam might be refracted by water particles suspended in the atmosphere, resulting in focus distortion. For RFID readers operating in UHF and microwave frequencies, water particles suspended in the ...

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