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7/31/2019 Radio Frequency Identification Devices (Rfid)_sharan
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RADIO FREQUENCYIDENTIFICATION DEVICES
(RFID)
Sharanjit Singh, 04EC56
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OUTLINE
Auto Identification Introduction to RFID
System Configuration
Working Principle
Types of Tag and Readers
Operating Frequency
Applications
Issues, Advantages and Disadvantages
References
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Auto Identification
Technologies or Method used for :-
Automatically identify the object
Collect Data about them
Enter data to controller/PC
Bar codes, Smart cards, Voice
recognition, Biometric technologies(retinal scans), RFID and Opticalcharacter recognition (OCR)
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What is RFID ?
Auto ID method that makes use of RADIO waves to retrieve data fromthe person/object
The chip on the object/persontransmit data through the antenna
Reader converts the received signalto digital information back
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System Configuration
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Working Principle
The two principle used are
1) Inductive coupling
2) Backscatter coupling
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Inductively Coupled RFID system
Coupling b/w reader and Tag’s coilPassive Tags (Range is less)
Load Modulation
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Backscattering RFID system
Power T/x by Reader provide the turn-onReflection (backscattering ) characteristics
controlled by Load resistor
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RFID Tag and its type
Passive Tags
Active Tags
Semi-Passive Tags
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Passive Tags
No Battery
Gets needed power using RF from
Reader High Signal Strength needed
Up to 3-5 m, very less
Max 128 bytes storage (WORM) Simple to design ,So Cheap
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Active Tags
Internal Power Source
More Reliable (can have a “Session ”)
Works Equally well with weak Signal
Can work in “RF challenged” environment
Range up to 500m and 128-256(R/w)
memory Bigger and expensive
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Semi-passive Tags
On-board battery, but cannot initiate
communication
To Broadcast Signal ,RF energy of
Reader reflected back
Greater Sensitivity than passive
Longer Battery Life than Active Can perform active functions under its
own power and thus act as sensor
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Reader
Transmit and Receive RF signals
Contain a control unit to execute
commands
Incorporate an interface to transfer data
Receives commands from a Host
computer Tree Walking Singulation Used
Dumb and Smart Readers
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Operating Frequency
Makes use of ISM frequency ranges
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APPLICATIONS
Retail Point of Sales
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APPLICATIONS
RETAIL
Customer Management Security Checking un-authorized
movement
Stock VerificationOut-of-Stock situation
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APPLICATIONS
Library
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APPLICATIONS
Two- way communication withdevices
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APPLICATIONS
Safety in Mines
E-Passports
Livestock
Transportation Payments
Lap ScoringHuman Implants (for Authentication )
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ADVANTAGES
No line of sight needed
More data holding capability than just a
unique product code.
Contact less and not so orientation
sensitive
Data integrity
Security against theft, shop lifting
Can be used in hostile environments
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Disadvantages
More expensive than a printed barcode
No uniform standard between different
countries and company
Consumer Privacy
System can be easily jammed and
spoofedTag collision
Reader Collision
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References
RFID Study guide by PAUL Sanghera
http://en.wikipedia.org/wiki/RFID
http://www.rfid-handbook.de/rfid/
http://www.aimglobal.org/technologies/rfid
http://www.rfid-weblog.com/
www.rfid-library.com
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THANK YOU
