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Radio Frequency IdentificationBy
Tanmoy Mukherjee
ECE
4th Year, 8th Semester
SKFGI
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Presentation Outline
1.What is RFID?2.How does it
work?3.Application4.Advantages5.Disadvantages6.Conclusion.
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WHAT IS RFID?
RFID= Radio Frequency IDentification. An ADC (Automated Data
Collection)
technology that
uses radio-frequency waves to
identify objects.
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Whats wrong with the Bar Code?
Line of Sight
One at a time
Manual Handling
Limited Data
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Whats Special with RFID?
No line of sight
100 IDs/sec
Automatic Handling
50Kb of Data (depends on the chip)
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Components of RFID
RFID TAG
ANTENNA
RFID READER
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How does RFID System Work?
Ethernet
RFID
Reader
RFID Tag RF Antenna Network Workstation
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TAG
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Block Diagram of a Tag
Antenna
Power Supply
Tx Modulator
RxDemodulator
Control Logic
(Finite State
machine)
Memory
Cells
Tag Integrated Circuit (IC)
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RFID Tags
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READER
A device that is used tointerrogate an Tag.
Basic components are
A scanning Antenna
A transceiver with a
decoder to interpret data Helps to personalize &
read data.
http://www.gaorfid.com/images/rfid_readers_902_236002.jpg
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RFID readers
Reader functions: Remotely power tags
Establish a bidirectional data link
Communicate with networked server(s)
Can read 100-300 tags per second
Readers (interrogators) can be at a fixed point such as
Entrance/exit
Point of sale
Readers can also be mobile/hand-held
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Operational frequencies
FrequencyRanges LF125 KHz HF13.56 MHz
UHF
868 - 915MHz
Microwave
2.45 GHz &5.8 GHz
Typical MaxRead Range
(Passive Tags)
Shortest1-12
Short2-24
Medium1-10
Longest1-15
Tag Power
Source
Generally passive
tags only, usinginductive coupling
Generally passivetags only, using
inductive orcapacitivecoupling
Active tags withintegral batteryor passive tags
using capacitivestorage,
E-field coupling
Active tags withintegral battery or
passive tags usingcapacitive storage,E-field coupling
Data Rate Slower Moderate Fast Faster
Ability to readnear
metal or wet
surfaces
Better Moderate Poor Worse
Applications
Access Control &Security
Identifying widgetsthrough
manufacturingprocesses or in
harsh environmentsRanch animalidentificationEmployee IDs
Library booksLaundry
identificationAccess ControlEmployee IDs
supply chaintracking
Highway tollTags
Highway toll TagsIdentification ofprivate vehiclefleets in/out
of ayard or facilityAsset tracking
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RFID in Smart Shelf
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RFID in Parking Lot
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RFID in Product Tracking
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Medical Field Patient Tagging
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RFID in Airport
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RFID In Library
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ADVANTAGES
Security
High speed Inventorying
Faster Check-out/-in
Reduce staff stress Prevent Theft
Searching, notifying
Gathering statistics on items become easy
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DISADVANTAGES
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Disadvantages
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Disadvantages
RFID ATM cards, credit cards, passport, other
valuable items.
Skimming: Read your tag, make my own.
Swapping: Replace real tags with decoys.
Producing a basic RFID device is simple.
A hobbyist could probably spoof most RFIDdevices in a weekend
for under $50.
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