Archive for April 2013

RFID technology

Wednesday, 10 April 2013
Posted by AVINASH CHAKRAVARTHI

       
what is RFID?

 Radio Frequency Identification Card

Radio-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

communication between rfid tag and rfid reader


Reader and tag communicate via RF signal
step1:- Carrier signal generated by              the reader
            Carrier signal sent out through the     antennas
            Carrier signal hits tag(s)








step2:- Tag receives and modifies carrier signal
        – “sends back” modulated signal (Passive  Backscatter – also referred to
           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
non conduction material
antenna
ic or microcontroller to store the data

  • components of rfid reader
(it can be a hand held or fixed)

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:-
  1. read only
     Tag ID is assigned at the factory during manufacturing
     • 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!!!


 


 
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