4. RFID
RFID = Radio Frequency Identification
Electronic labeling and wireless identification of objects using radio frequency
Tag carries with its information
◦ a serial number
◦ Model number
◦ Color or any other imaginable data
When these tags pass through a field generated by a compatible reader, they transmit this
information back to the reader, thereby identifying the object
5. RFID components
A basic RFID system consists of these components:
◦ A programmable RFID tag/inlay for storing item data;
◦ Consisting of an RFID chip for data storage
◦ an antenna to facilitate communication with the RFID chip
A reader/antenna system to interrogate the RFID inlay
Application software and a host computer system
6. RFID Tag
The RFID tag consists of an integrated circuit (IC) embedded in a thin film medium.
Information stored in the memory of the RFID chip is transmitted by the antenna circuit
embedded in the RFID inlay via radio frequencies, to an RFID reader
3 types
◦ Passive
◦ Semi-passive
◦ Active
7. Types of RFID Tags
Active Tags
1. Use a battery
2. communicate over distances of several meters
Semi-passive Tags
1. Contain built-in batteries to power the chip’s circuitry, resist interference and circumvent a lack of
power from the reader signal due to long distance.
2. They are different from active tags in that they only transmit data at the time a response is
received
Passive Tags
1. Derive their power from the field generated by the reader
2. without having an active transmitter to transfer the information stored
15. Conclusion
Positive
◦ RFID is a contactless reading technology and can read through other materials
◦ Hold more data than barcode does
◦ RFID tags data can be changed or added
◦ More effective, bring lots of convenience to us
Negative
◦ Cost is relatively remain high (compare to barcode)
◦ RFID signals may have problems with some materials
◦ RFID standards are still being developed
