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Getting Started with RFID by Tom Igoe

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Chapter 1. Radio Frequency Identification

Like bar code recognition, RFID relies on tagging objects in order to identify them. Unlike bar codes, however, RFID tags don’t need to be visible to be read. An RFID reader sends out a short-range radio signal, which is picked up by an RFID tag. The tag then transmits back a short string of data. Depending on the size and sensitivity of the reader’s antenna and the strength of the transmission, the tag can be several feet away from the reader, enclosed in a book, box, or item of clothing. In fact, some large clothing manufacturers are now sewing RFID tags into their merchandise, to be removed by the customer.

There are two types of RFID system: passive and active. Passive RFID tags contain an integrated ...

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