1. How RFID Works.

2. Radio-frequency identification
(RFID) is the use of a wireless non-
contact system that uses radio-
frequency electromagnetic fields
to transfer data from a tag
attached to an object, for the
purposes of automatic
identification and tracking.

3. Basic of RFID work
• Data- stored within an RFID tag's microchip waits
to be read.
• The tag's antenna receives electromagnetic
energy from an RFID reader's antenna.
• Using power from its internal battery or power
harvested from the reader's electromagnetic
field, the tag sends radio waves back to the
reader.
• The reader picks up the tag's radio waves and
interprets the frequencies as meaningful data.

4. Passive RFID
• Don’t have battery, and powered by the
electromagnetic fields used to read them.
• Passive tags are read up to 20 feet (six meters)
away.
• Really low cost of production between 7 and
20 cents.
• As, they haven’t got battery, they haven’t got
expiry date.

5. Semi-Passive and Active RFID
• Has internal battery to power circuits.
• Use broadcast high frequencies from 850 to
950 MHz that can be read 100 feet (30.5
meters) or more away. With additional
batteries this distance can be increased up to
100 meters.
• Mostly batteries are working for 10 years.

6. Types of storage of information
• Read-Write – data can be added to or
overwritten.
• Read-only – you can only read data.
• WROM (Write once, read many) – they can
have additional data added once, but after
they can not be overwritten.