Archive for April 2013
what is RFID?
Radio Frequency Identification CardRadio-frequency identification (RFID) is the wireless non-contact use of radio-frequency electromagnetic fields to transfer data, for the purposes of automatically identifying and tracking tags attached to object
- rfid tags serves purpose like Bar code and Magnetic strip on the back of credit card or ATM cards
Simple Understanding of RFID Technology .
The tag gets power from the rfid reader and data from rfid tag will reaches rfid tag by radio frequency
waves
waves
communication between rfid tag and rfid reader
Reader and tag communicate via RF signal
Carrier signal sent out through the antennas
Carrier signal hits tag(s)
step2:- Tag receives and modifies carrier signal
as “field disturbance device”)
Antennas receive the modulated signal and send them to the Reader
step3:- Reader decodes the data
Results returned to the host application
RFID components:
it has two parts rfid tag and rfid reader.- components in rfid tag
antenna
ic or microcontroller to store the data
- components of rfid reader
same as rfid tag including the processor with software to decode the
information stored in ic of rfid tag and stores this information in the database of the computer
Types of RFID.
- Passive vs. Active RFID Comparison
The primary difference between passive and active RFID tags is that active tags are powered by a battery and automatically broadcast their signal, whereas passive tags do not have a power source and only transmit a signal upon receiving RF energy emitted from a reader in proximity of the tag.
Passive Active Read Range Up to 40 feet (fixed readers)
Up to 20 feet (handheld readers)Up to 300 feet or more Power No power source Battery powered Tag Life Up to 10 years depending upon the environment the tag is in 3-8 years depending upon the tag broadcast rate Tag Costs $.10-4.00 or more depending upon quantity, durability, and form-factor $15-50 depending upon quantity, options (motion sensor, tamper detection, temperature sensor), and form-factor Ideal Use For inventorying assets using handheld RFID readers (daily, weekly, monthly quarterly, annually). Can also be used with fixed RFID readers to track the movement of assets as long as security is not a requirement. For use with fixed RFID readers to perform real-time asset monitoring at choke-points or within zones. Can provide a better layer of security than passive RFID. Readers Typically higher cost Typically lower cost
they were many types of rfid tags based on memory storage:-
- read only
• Can never be changed
• No additional data can be assigned to the tag
2.write once ready many
Tag is locked once written(like dvd)
3.read/write
Tag data can be change over time(data can be editable)
based on the purpose we will choose the tags that serves the purpose
RFID vs Bar Code?
No line of sight required for reading
Multiple items can be read with a single scan
Each tag can carry a lot of data (read/write)
Individual items identified and not just the category
Passive tags have a virtually unlimited lifetime
Active tags can be read from great distances
Can be combined with barcode technology
Applications of RFID:-
wall mart is first to use rfid technology, it enable to improve it's efficiency of global supplying and accurate ordering delivery
it played a remarkable role in manufacturing retails, defense,travelling any many more sectors
the following are important applications:-
will be updated soon!!!!
how to make our own rfid tag and reader?
will be updated soon!!!
