30-07-2010, 07:44 PM
An Introduction to RFID Technology
In the recent years, radio frequency identification technology has moved from obscurity into mainstream applications that help speed the handling of manufactured goods and materials.With RFID,the identification from a distance is possible. larger set of unique IDs are supported by it and
More info about the product can be included in the RFID like the mfg date, etc.
RFID principles
Active and passive are the two major kinds of RFID devoces. Active tags require a power source whereas the the passive ones doesn't require maintenance or batteries. One example of an active tag is the
transponder attached to an aircraft that identi-
fies its national origin. An active tag contains a antenna, a semiconductor chip . The tag antenna transfers the tag's ID and also captures the tag's energy.
Near field RFID:
In this, a reader passes a current through the tag and the magnetic field produced is corresponding to the information stored. It is the most straightforward for implementing the passive RFID.
Far-field RFID
The RFID tags based on far-field emissions capture Electromagnetic waves propagating from a dipole antenna attached to the reader. A smaller dipole antenna in the tag receives this energy as an alter-
nating potential difference that appears across the arms of the dipole.This is then fed to circuits that finally power the RFID tag.
For full details , refer this pdf:
[attachment=4038]
For more pdfs and ppts:
http://scribddoc/6915153/RFID
http://scribddoc/29450606/Rfid
http://scribddoc/6863450/RFID
In the recent years, radio frequency identification technology has moved from obscurity into mainstream applications that help speed the handling of manufactured goods and materials.With RFID,the identification from a distance is possible. larger set of unique IDs are supported by it and
More info about the product can be included in the RFID like the mfg date, etc.
RFID principles
Active and passive are the two major kinds of RFID devoces. Active tags require a power source whereas the the passive ones doesn't require maintenance or batteries. One example of an active tag is the
transponder attached to an aircraft that identi-
fies its national origin. An active tag contains a antenna, a semiconductor chip . The tag antenna transfers the tag's ID and also captures the tag's energy.
Near field RFID:
In this, a reader passes a current through the tag and the magnetic field produced is corresponding to the information stored. It is the most straightforward for implementing the passive RFID.
Far-field RFID
The RFID tags based on far-field emissions capture Electromagnetic waves propagating from a dipole antenna attached to the reader. A smaller dipole antenna in the tag receives this energy as an alter-
nating potential difference that appears across the arms of the dipole.This is then fed to circuits that finally power the RFID tag.
For full details , refer this pdf:
[attachment=4038]
For more pdfs and ppts:
http://scribddoc/6915153/RFID
http://scribddoc/29450606/Rfid
http://scribddoc/6863450/RFID
