Radio-frequency identification (RFID) uses radio waves to automatically identify objects. There are three main components: RFID tags attached to objects, RFID readers that can read from and write to tags, and backend systems. Tags can be passive (powered by reader), active (own power source), or semi-active. RFID is used for supply chain management, asset tracking, medical purposes, and more. While offering advantages over barcodes, RFID also presents technical challenges and potential ethical issues regarding privacy and surveillance.

1. RFID
RADIO FREQUENCY IDENTIFICATION

2. What is RFID?
Radio-frequency identification (RFID) is an automatic
identification method using radio waves.
RFID also began to see use in wildlife monitoring and research.
RFID tags can be used to monitor animal movement without
adversely affecting the animal,

3. There’s a chip

4. Implanted RFID tags in Humans

5. Applications
 Supply chain automation
 Asset tracking
 Medical applications
 People tracking
 Manufacturing
 Retail
 Warehouses
 Livestock
 Timing

6. The RFID System
• Tag.
• Reader.
• Reader antenna.
• Controller.
• Host and software system.
• Communication infrastructure.

7. Tag
An RFID tag is a device that can
store and transmit data to a reader
in a contact less manner using
radio waves.
RFID tags can be classified in three
different ways.
Passive

8. Passive Tag
 No on-board power source (for example, a battery)
 Uses the power emitted from the reader to energize itself and
transmit its stored data to the reader
 Reader always communicates first, followed by the tag.

9.  Smaller than an active or semi-active tag. It has a variety
of read ranges starting with less than 1 inch to about 30
feet (9 meters approximately).
 Cheaper compared to an active or semi-active tag.

10. Active Tag
 Has on-board power source (for example, a battery; other
sources of power, such as solar, are also possible)
 Own on-board power supply to transmit its data to a
reader.
 No need for reader's emitted power for data transmission.

11.  A tag always communicates first, followed by the reader.
 Can broadcast its data to its surroundings even in the
absence of a reader

12. Another way to Classify Tags
 Read-only (RO)
 Write once, read many (WORM)
 Read-write (RW)

13. The RFID System
• Tag.
• Reader.
• Reader antenna.
• Controller.
• Host and software system.
• Communication infrastructure.

14. Reader????
An RFID reader can read from
and write data to compatible RFID
tags.
A reader thus doubles up as a
writer. The act of writing the tag
data by a reader is called creating
a tag.

15. A reader has the following main
components:
Transmitter
Receiver
Microprocessor
Memory
Controller (which may reside as
an external component)
Communication interface
Power

16. Working
A radio device called a tag is attached to the object that
needs to be identified.
When this tagged object is presented in front of a
suitable RFID reader, the tag transmits this data to
the reader (via the reader antenna).
The reader then reads the data and has the capability to
forward it over suitable communication channels.
This application can then use this unique data to identify
the object presented to the reader.
It can then perform a variety of actions

18. Technical Issues
 Tag Collision
 Reader Collision
 Tag Readability
 Read Robustness

19. Ethical Issues
 Passive RFID tags could conceivably used for surveillance
of unsuspecting tag carriers
 Embedding of RFID tags in humans: This has been proven
to work, but should it be done?

20. Advantages
Contactless. An RFID tag can be read without any physical
contact between the tag and the reader.
Writable data. The data of a read-write (RW) RFID tag can
be rewritten a large number of times.
Absence of line of sight. A line of sight is generally not
required for an RFID reader to read an RFID tag.

21. Advantages Contd.
 Variety of read ranges.
 Wide data-capacity range.
 Support for multiple tag reads.
 Perform smart tasks.

22. Disadvantages
 Poor performance with RF-opaque and RF-absorbent
objects.
 Impacted by environmental factors.
 Limitation on actual tag reads.
 Impacted by hardware interference.

23. CONCLUSION
 RFID, is an emerging technology which can be used for a
variety of applications.
 However, the potential for abuse of this technology is vast
and requires careful consideration to avoid.