rfid technology full report

7/28/2019 Rfid Technology Full Report

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INTRODUCTION

Almost every product in the market has a barcode printed on it. Barcodes are machine-readable

parallel bars that store binary information, revealing information about the product. Thus, it acts as the

product fingerprint. As we go to the supermarket to buy things, the checkout person runs our selection over

the scanner to scan the barcode, theres an audible beep, and we are told how much money we owe.

But the days of barcode are numbered. The reason is that a technology called radiofrequency

identification (RFID) is catching on.RFID tags are being used by corporations to track people and products

in just about every industry. They transform everyday objects like cargo containers, car keys, and even

clothes on the rack at a shopping mall into mini nodes on a network. Databases then record the location and

status of these network nodes to determine product movements. [4], [3]

This technology can completely replace barcodes.

The automotive industry makes use of small RFID tags that offer a high level of security at low cost.[7]

A lot of developments are taking place in RFID technology that will change the course of the industry,

particularly in the supply chain area.

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TRANSPONDER

A tag is any device or label that identifies the host to which it is attached. It typically does not

hinder the operation of the host or adversely affect its appearance.

The word transponder is derived from the words transmitter and responder. The tag responds to a

transmitted or communicated request for the data it carries.

Fig.1 Transponder Block Diagram

The transponder memory may comprise of read-only (ROM), random access (RAM), and non-

volatile programmable memory for data storage depending on the type and sophistication of the device. The

ROM-based memory is used to accommodate security data and the transponder operating system

instructions which in conjunction with the processor or processing logic deals with the internal house-

keeping functions like response delay timing, data flow control and supply switching. The RAM-based

memory is used for temporary data storage during transponder interrogation and response. The non-volatile

programmable memory may be of several types of which the electrically erasable programmable read-only

memory (EEPROM) is the most common. It is used to store the transponder data and needs to be non-

volatile to ensure that the data is retained when the device is in its quiescent or power-saving sleep state.

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ANALOG CIRCUITRY DATA TRANSFER

POWER SUPPLY

DIGITAL CIRCUITRYCONTROL LOGICSECURITY LOGICINTERNAL

LOGIC/MICROPROCESOR

EEPROM

ROM

RAM


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Data buffers are further components of memory used to temporarily hold the incoming data

following demodulation and outgoing data for modulation and interface with the transponder antenna. The

interface circuitry provides the facility to direct and accommodate the interrogation field energy for

powering purposes in passive transponders and triggering of the transponder response. The transponder

antenna senses the interrogating field and serves as the means for transmitting the transponder response for

interrogation.[6]

CLASSIFICATION OF TAGS

On the basis of the presence of battery, tags can be classified into active or passive tags.

Active tags are powered by an internal battery and are generally read/write devices. They contain acell having a high power to weight ratio and are capable of operating over a temperature range of -50 to +70

degree Celsius. Active tags have a finite life time. A suitable cell coupled to suitable low power circuitry

can ensure functionality of ten or more years depending on operating temperatures, read/write cycles and

usage. They have greater size and increased cost compared to passive tags.

Passive tags operate without an internal battery source, deriving the power to operate from the field

generated by the reader. They are hence lighter than active tags and have greater life time. They have

shorter read ranges compared to active tags. They are also constrained in their ability to store data and

perform well in electromagnetically noisy environments.[2],[5]

RFID tags can also be classified on the basis of coupling into inductively and capacitively coupled

tags.

Inductively coupled RFID tags consist of the silicon microprocessor which vary in size depending

on their purpose and metal coil which is made of copper or aluminum wire that is wound into a circular

pattern on the transponder. This coil acts as the tags antenna. The tag transmits signal to the reader with the

read distance determined by the size of the coil antenna. It also consists of an encapsulating material of

glass or polymer that wraps around the chip and coil. Inductively coupled RFID tags are powered by the

magnetic field generated by the reader .The tags antenna picks up the magnetic energy and the tag

communicates with the reader. The tag then modulates the magnetic field in order to retrieve and transmit

data back to the reader. Data which is transmitted back to the reader is directed to the host computer. These

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tags are expensive due to the silicon, the coil antenna and the process that is needed to wind the coil around

the surface of the tag.

Capacitively coupled RFID tags consist of an RFID chip and an antenna made from two plate

electrodes. The reading mechanism between the tag and the reader is through capacitive coupling. Placing

the tag in an electric field powers the tag. The field gradient across the tag results in a charge buildup

between the plates and hence a potential difference which is used to energize the small silicon IC at its

center.[6],[8]

Data stored in data carriers require some organization and additions like data identifiers and error

detection bits to satisfy recovery needs. This is known as source encoding. Standard numbering systems

such as UCC/EAN can be applied to data stored in tags. Tags are basically used to carry

1.identifiers, in which a numeric or alphanumeric string is stored for identification purposes or as an access

key to data stored in a computer or information management system.

2. Portable data files in which information is organized for communication. Tags can be obtained that can

store single bits to kilobits. The single bit devices are used for surveillance purposes. Retail electronic

article surveillance (EAS) is the typical application which activates an alarm in the interrogating field. They

can also be used for counting applications.

Devices characterized by data storage capacities upto 128 bits are sufficient to hold a serial or

identification number together with parity check bits. These devices may be manufacturer or user

programmable. Tags with data storage capacities upto 512 bits are user programmable and suitable for

accommodating identification and other specific data like serial numbers, package content, key process

instructions and results of earlier interrogation/response transactions. Tags with storage capabilities of 64

kilobits are carriers of portable data files. By increasing the capacity, facility can be provided for organizing

data into fields or pages that may be selectively interrogated during the reading purpose. Data transfer rates

are linked to carrier frequency. The higher the frequency, the higher the transfer rates. Depending on the

memory, the tag contains data that can be read-only; write once read many (WORM) or read /write. Read-

only tags are low capacity devices programmed at source usually with an identification number. WORM

devices are user programmable devices. Read/write devices are also user programmable but allow the user

to change data stored in a tag. Portable programmers may also be present that allows in-field programming

of the tag while attached to the item being identified or accompanied.[6]

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READER/INTERROGATOR

The reader/interrogators can differ considerably in complexity depending on the type of tags being

supported and functions to be fulfilled. The overall function is to provide the means of communicating withthe tag and facilitating data transfer. Functions performed by readers include signal conditioning, parity

error checking and correction. Once the signal from a transponder has been correctly received and decoded,

algorithms can be applied to decide whether the signal is a repeat transmission and may then instruct the

transponder to stop transmitting. This is known as Command Response Protocol and is used to circumvent

the problem of reading multiple tags in a short span of time. Using interrogators in this way is also referred

to as Hands Down Polling. A more secure, but slower tag polling technique is called Hands Up Polling

which involves the interrogator looking for tags with specific identities and interrogating them, in turn. A

further approach uses multiple readers, multiplexed into one interrogator but results in cost increase.[6]

RANGE AND POWER LEVELS

The range that can be achieved in an RFID is determined by:

1. The power available at the reader/interrogator to communicate with the tags.

2. The power available within the tag to respond.

3. The environmental conditions and structures, the former being more significant at higher frequencies

including the signal to noise ratio.

Although the level of available power is the primary determinant of range, the manner and

efficiency in which that power is deployed also influences the range. The field or wave generated from an

antenna extends into space surrounding it and its strength diminishes with respect to distance. The antenna

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design determines the shape of the field or propagating wave delivered so that range is also influenced by

the angle subtended between the tag and antenna.

In the space free of any obstruction or absorption mechanism, the strength of field reduces in inverse

proportion to the square of the distance. For a wave propagating through a region in which reflections can

arise from the ground and from obstacles, the reduction in strength can vary as an inverse fourth power of

the distance. Where different paths arise in this way, the phenomenon is called multi-path attenuation. At

higher frequencies, moisture presence can cause absorption which can further affect the range. Where a

number of reflective obstacles are to be encountered within the applications under consideration, which

may vary from time to time, it may also be necessary to establish the implications of such changes through

an appropriate environmental evaluation.

The power within the tag is generally much less than that from the reader, requiring sensitivedetection capability within the reader to handle the return signals. In some systems, the reader constitutes a

receiver and is separate from the interrogation source or transmitter, particularly if the up-link (from

transmitter to tag) carrier is different from the down-link (from tag to reader).

100-500mW power are values quoted for RFID systems, whereas the actual values should be

confirmed with the appropriate regulatory authorities in the countries where the technology is being

applied. The form in which the power is delivered, pulsed or continuous, and the associated values are also

indicated by the authority.[6]

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RFID SYSTEM

An RFID system consists of RFID tags ,a means of reading or interrogating the tags and a means of

communicating the data to a host computer or information management system. The system will also

include a facility for entering or programming data into tags, if it is not done at the source by the

manufacturer. There may also be present antennas for communication between the ag and the reader.

Fig.2. RFID System

The reader sends out a radio frequency wave to the tag and the tag broadcasts back its stored data to

the reader. The system has two antennas, one for the tag and the other on the reader. The data collected

from the tag can either be sent directly to a host computer through standard interfaces or it can be stored in

a portable reader and later updated to the computer for data processing. The automatic reading and direct

use of tag data is called automatic data capture.[8]

When the tag which is battery free,is to be read ,the reader sends out a power pulse to the antenna lasting

for about 50ms.The magnetic field generated is collected by the antenna in the transponder that is tuned to

the same frequency. This received energy is rectified and stored on a capacitor within the transponder.

When the power pulse has finished, the transponder immediately transmits back its data, using the energy

stored within its capacitor as its power source. The data is picked up by the receiving antenna and decoded

by the reader unit. Once all the data has been transmitted, the storage capacitor is discharged resetting the

transponder to make it ready for the next read cycle. The period between transmission pulses is called sync

time and lasts between 20ms and 50ms depending on the system set up.

The transmission technique between the transponder and the reader is FSK.This approach has good

resistance to noise and is cost effective to implement.[7],[6]

7

RF MODULE CONTROL

MODULE

HOST COMPUTER

READERANTENNA

TRANSPONDER (TAG)


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SYSTEM PERFORMANCE

Reading distance: The actual reading distance depends on the transponder type, electromagnetic noise,

transponder orientation, antenna type. In general, a 32mm glass transponder can be read with a stationary

reader and gate antenna from a distance of about 1m.Larger transponders can achieve ranges upto 2m with

handheld readers offering lower ranges upto 250mm.

Data accuracy: A 16-bit cyclic redundancy check algorithm is used to ensure that only valid data is sent

from the reader to its associated controller.

Antenna selection: Of the antenna types, the one giving larger read ranges is selected. Electromagnetic

noise affects the readout pattern.

Transponder orientation: For maximum range, the antenna orientation with respect to the transponder

must be optimized for maximum coupling. The orientation in line with a ferrite antenna produces the largest

read ranges from 2mm glass transponder.

Reading speed: Many applications require that that transponder must remain in the reading range. Since a

standard stationary reader completes one cycle in abut 120ms, transponders must remain in the boundaries

of a readout pattern for at least that amount of time.[7]

IMMOBILIZER SYSTEM

Immobilizers are the security systems in automobiles. The latest generation of RFID transponders

called crypto transponders can be used as the chief part of immobilizers.

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Fig. 3. IMMOBILIZER TRANSPONDER

Key-based immobilizer systems consist of four main components. The core of the system is the

transponder, a batteryless device which is available in various form factors and with different

functionalities. For operation, the transponder has to be supplied with energy from an external source. The

transceiver generates a high frequency magnetic field which is radiated by an antenna coil. The energy

activates the transponder and it sends a data stream in form of a modulated RF signal. This signal is

demodulated by the transceiver and then passed to the controller for data processing. Different physical

principles for RFID systems have been established on the market. Concerning the transmission of energy,

two different systems can be distinguished.[7]

Full Duplex Systems. The energy for the transponder and the data signal generated by the transponder are

transmitted at the same time.

Half Duplex Systems. The transmission of the energy for the transponder and the data signal from the

transponder are done consecutively. The transponder stores energy in a capacitor and as soon as the

transmitter is switched off, the energy is used to transmit data. The different techniques have an impact on

system design and reading range, but have no impact on the system.[7]

Cryptographic Background

From the cryptographic point of view, the problem of immobilization consists of two different tasks,

the identification of the driver and proving his identity, the authentication. Several cryptographic means are

applicable for driver authentication.

Knowledge

The authentication is based on the knowledge of a secret, for example a password or PIN (Personal

Identification Number) that has to be presented to proof the identity. For automotive applications any

method using a keyboard is unacceptable for most of the users. In addition the level of security is

unacceptable.

Biometrics

Biological attributes, such as fingerprints, voice, retinal or face patterns could theoretically be used

for authentication of the driver. However, the technical effort for such systems is still high compared to

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key-based immobilizers and not acceptable for automotive applications. In addition, the problem of renting

a car to someone else and emergency use of a vehicle becomes a critical issue.

Possession

Authentication by means of possession is the most common method and will also be widely spread

in future. The simplest implementation is the possession of a mechanical key. A much higher security is

offered if the key contains an electronic tag such as a transponder. To start the vehicle, the mechanical key

and the code in the transponder must match.

All cryptographic systems described above are based on static authentication procedures, that means

the security system of the car can verify the identity of the key but the electronics in the key cannot check

the identity of the communication partner. A mutual authentication procedure which also allows the key to

verify the identity of the communication partner is one feature that would improve the security level of thesystem.

A much higher level of security can be achieved with a simple symmetrical algorithm known as

challenge / response protocol. The security system of the vehicle can check the identity of the key by

sending a question (a challenge) and verifying the answer (response). The correct answer can only be given

if a secret is known that is shared by both partners. This challenge/response

concept has several advantages. During normal use, the secret is not exchanged and both challenge and

response vary from cycle to cycle.[7]

Standard Security Architectures using RFID

Various security systems using RFID transponders have been established on the market.

Fixed Code Systems are the most commonly used. During initialization, the controller learns

different identification codes stored in the transponders that belong to a vehicle. When the driver places the

ignition key in the lock cylinder, the fixed code in the transponder is read and compared to the codes stored

in the memory of the controller.

The level of security depends to a great extend on the type of transponder used. There are write once

transponders on the market which are delivered unprogrammed. Programming is done by the user.

Commercially available readers/writers allow to pick up the code in the transponder while away from the

vehicle and to program an unprogrammed unit. Thus a copy of the fixed code has been generated which

cannot be distinguished from the original. True Read Only systems on the market are factory programmed

with a unique identification number. These systems do not allow copies. However, it is possible to emulate

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the data signal on the radio frequency level. The effort to design an emulator is considerable and requires

RF design knowledge.

Rolling Code Systemsoperate in the same way as fixed code systems except that the secret code in

the key is only valid for a certain period of time, typically from one ignition cycle to the other. The System

Security Controller reprograms the transponder (which is a Read/Write type) periodically. The secret is

changed, but in terms of cryptographics the procedure is still a static authentication. To guarantee the

reliability of the system, resynchronization procedures have to be implemented in case the transponder

programming fails or the transponder is reprogrammed by mistake while away from the vehicle. Especially

these procedures for resynchronization are the most critical issues in such systems.

A simple mutual authentication can be provided by password protected transponders. The

transponder will deny access to the secret data information stored in its memory unless a password ispresented and thus the identity of the reader proven. The length of the password can vary depending on the

required security level. The password is usually transmitted in plain text and can be picked up or guessed if

the transponder is available. Depending on the length of the password, the time to guess the password can

vary from several minutes to several years. A limitation of the system is the total transaction time which can

be unacceptable for practical use in the application.

Combined Rolling Code / Password Systems can also be implemented using password protected

Secured Read Write Transponders. They provide a higher level of security.

Crypto Transponders

Crypto Transponders are the second generation of transponders for use in immobilizers. The new

generation of crypto transponders developed by Texas Instruments are based upon the TIRIS TM half

duplex RFID technology and are compatible to all standard RF interfaces of the TIRIS TM product range.

System Overview

The Digital Signature Transponder (DST) is a crypto device which offers the challenge/ response

functionality. During initialization, the vehicle security system and the transponder exchange a secret

encryption key. The key cannot be read out, only the transponder response to a challenge sent by the

transceiver can be read. In a typical application, the vehicle security system generates a 40 bit random

number (the challenge), and sends it to the transponder using Pulse Width Modulation (PWM). In the

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transponder the challenge is shifted into the challenge register. For a short period of time, energy is

provided by the transceiver and the encryption logic generates a 24 bit response (signature).

Fig. 4. Crypto

Transponder System

The response R is a function of the encryption key Ke , the challenge RAND and the cryptographic

algorithm Fc. R=f(Fc, RAND, Ke ).

The response is returned to the transceiver using Frequency Shift Keying (FSK).

The security system calculates the expected response using the same algorithm and the same

encryption key and compares the response received from the transponder to the calculated one. The

calculation of the expected response can be done simultaneously to the communication between

transponder and reader or after reception of the transponder response. If expected and calculated response

are equal, the information is sent to the engine management computer. In time critical applications, the

challenge and the response can be generated after immobilization and stored for the next cycle.

The advantages of this system are obvious:

Depending on the challenge the response is different every time. The authentication procedure is

dynamic.

No portion of the encryption key is ever transmitted after initialization of the transponder

The encryption key cannot be read out

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The transponder cannot be duplicated

The encryption key can be irreversibly locked or altered if desired.

The transponder is a complex logical and mechanical micro system designed to operate at very low

power. During energy transfer less than 1A is consumed by the transponder IC. This allows a capacitor to

be charged over a considerable distance within a reasonable amount of time, typically less than 50ms. Even

during the encryption process, the current consumption is below 16A. Therefore, the typical maximum

read range is comparable to standard Read Only systems.

Fig. 5. Plastic Wedge Transponder

Design Objectives

The Digital Signature Transponder was based on many established circuit blocks and assembly

techniques to ensure compatibility to existing transceiver hardware and to keep existing qualified automated

production lines.

Apart from the design challenges for the IC design:

Maintain low power consumption despite the large number of gates for encryption

Keep wiring of the encryption circuitry to a minimum

Keep chip size to a minimum,

A considerable effort has been spent to ensure

A high level of cryptographic security

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Fast transaction times for the challenge/response cycle

Low data processing effort for the encryption algorithm in the car security system

Reliability in the application in terms of highly sophisticated supervision circuitry in the

transponder.

Encryption

All encryption algorithms are theoretically breakable. An algorithm is computationally secure if it

cannot be broken within a reasonable amount of time respectively with reasonable resources. In this context

reasonable is open to interpretations. Current assumptions for attacks against immobilizer systems are:

The attacker will not spend more than five minutes in the vehicle

The key is not longer than ten days available for analysis

The key is not longer than ten days available for analysis

The attacker is familiar with cryptoanalytical techniques.

Dictionary attacks can be used if the key was available to the attacker for a

certain period of time to build a dictionary of challenge response pairs. In the vehicle, the attacker hopes for

a challenge that is already in his dictionary to reply with the correct response and start the engine.

Statistical calculations show that even if the key is available for 10 days and the dictionary is built at

a rate of four responses per second, the probability for a successful attack within five minutes in the car is

only 0.47%. Taking into consideration that this effort has to be repeated for each vehicle, it can be

understood that this method is uneconomic for the thief.

Cryptoanalysis makes use of the knowledge of the algorithm. Those attackers try to find amathematical solution to the problem of finding the encryption key with a limited amount of challenge

response pairs. The algorithm in the Digital Signature Transponder has been developed to frustrate these

cryptoanalytical methods.

Read/Write Crypto Transponder for Short Cycle Time

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The TK5561A-PP is a complete transponder integrating all important functions for immobilizer and

identification systems. It consists of a plastic cube which accommodates the crypto IC and the antenna

realized as tuned LC-circuit. It is a R/W crypto transponder for applications which demand higher security

levels than those which standard R/W transponders can fulfill. For this reason it has an additional

encryption algorithm block which enables a base station to authenticate the transponder. Any attempt to

fake the base station with a wrong transponder will be recognized immediately. For authentication, the base

station transmits a challenge to the transponder. This challenge is encrypted by both IC and base station

.Both should posses the same secret key. Only then the result can be expected to be equal. The on-chip 320

bit EEPROM(10 blocks of 32 bits)can be read and written blockwise by a base station Two or four blocks

contain the ID code and six memory blocks are used to store the crypto key as well as the read or write

options.125 kHz is the typical operational frequency of a system using this transponder.

Transponder Antenna

The antenna consists of a coil and a capacitor for tuning the circuit to the nominal carrier frequency

of 125kHz.The coil has a ferrite core for improving the distance of read, write and programming operations.

Fig. 6. Analog Front End (AFE)

The AFE includes all circuits directly connected to the coil. It generates the ICs power supply and

handles the bidirectional data communication with the base station. It consists of the following blocks:

Rectifiers to generate a DC supply voltage from the AC coil voltage

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Clock extractor.

Field gap detector for data transmission from the base station to the IC.

Controller

The controller has the following functions:

Control memory access.

Handle correct write data transmission.

Error detection and error handling.

Control encryption operation.

Control adaptation of resonance frequency.

Power on reset

It is a delay reset which is triggered when the supply voltage is applied.

Adapt

The IC is able to minimize the tolerance of the resonance frequency between the base station and the

transponder by on-chip capacitors in parallel to the LC circuit of the transponder.

Bitrate Generator

The bitrate generator can deliver bitrates of RF/32 and RF/64 for data transmission from the IC to

the base station.

Bit Decoder

The bit decoder forms the signals needed for write operation and decodes the received data bits in

the write data stream

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Modulator

The modulator consists of two data recorders. Manchester and biphase modulation are possible.

HV Generator

Voltage pump which generates about 18V for programming of the EEPROM.

Memory

The memory is a 320-bit EEPROM which is arranged in 10 blocks of 32 bits each. All 32 bits of a

block are programmed simultaneously. The programming voltage is generated on-chip.

Crypto Circuit

The crypto circuit uses an algorithm to encrypt the challenge which is written to the chip. The

computed result can be read by the base station. Comparing the encryption results of the base station and

the IC, a high security authentication procedure is established.[7]

Writing Data into the IC

A write sequence of the IC is shown below.

Writing data into the transponder occurs by interrupting the RF field with short gaps. After the start

gap the write op-code (10) is transmitted. The next 32 bits contain the actual data. The last 4 bits denote the

destination block address. If the correct number of bits has been received, the actual data is programmed

into the specified memory block. [7]

Fig. 7. Write protocol to program the EEPROM

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Write Data Decoding

The time elapsing between two detected gaps is used to encode the information. As soon as a gap is

detected, a counter starts counting the number of field clock cycles until the next gap will be detected.

Depending on how many field clocks elapse, the data is regarded as 0 or 1.The required number of field

clocks is shown in figure .A valid 0 is assumed if the number of counted clock periods is between 16 and

32, for a valid 1 it is 48 or 64 respectively. Any other value being detected results in an error and the

device exits write mode and returns to read mode.[7]

Fig. 8. Write data decoding scheme

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APPLICATIONS

Principle areas of applications of RFID include:

1. Transportation

2. Manufacturing and processing.

3. Security.[4]

Texas Instruments Radio Frequency Identification (TI-RFid) Systems has introduced its new RFID

tag for textile rental and dry cleaning applications. TI-RFid tags provide more accurate identification and

greater accountability as well as improved handling through each stage of cleaning and processing to final

customer delivery.

RFID system allows booksellers to gain such information as the range of books a shopper hasbrowsed, the number of times a particular title was picked up, and even the length of time spent flipping

through pages. Gillete ,Wal-Mart, and Tesco will install specially designed shelves that can read RF waves

emitted by microchips embedded in millions of their products. The shelves can scan the contents of the

shelves and, via computer, alert store employees when supplies are running low or when theft is detected.

[4]

RFID tags loaded with biometric information will be embedded in passports to ensure travelers comply

with security regulations.

RFID technology is also being used to improve luggage handling in airports.

Certain specific applications of RFID include:

1. Fleet management.

2. Inventory and asset management.

3. Warehouse automation.

4. Hazardous material management.

5. Packaging, security and access control.

6. Smart card payment systems.[4]

ADVANTAGES

RFID technology permits no line of sight reading.

Robustness and reliability under difficult environmental conditions.[5],[3]

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These tags can be read through water, snow, concrete, bricks, plastics, wood, and most non-

metallic materials

Available in a wide variety of physical forms, shapes, sizes and protective housings.

RFID tags can be read at very high speeds.

In most cases the response time is less than 100ms.

Difficulty in duplicating, offers a high degree of security. [5]

DISADVANTAGES

Cost

RFID solutions cost much higher than the conventional barcodes. A large fraction of its cost lies inthe software infrastructure and the enterprise application and integration[4]

Lack of standardization.

Standardization has not been provided across many fronts, ranging from the different data formats

used to interoperatability between RFID readers and tags from different vendors to interference between

RFID products from different manufacturers.[4],[2]

RFID will hurt privacy

RFID transponders are forever part of the product, and designed to respond when a signal is

received.[4],[1]

CONCLUSION

RFID tags will soon be tracking millions of consumer products worldwide. Manufacturers will

know the exact location of each product they make from the time it is made until it is used and tossed in the

recycle bin or trash can. The crypto transponders will be well suited for future generation vehicle entry

systems.[3]

The RFID tagging will take off when the cost of the tags drops to one percent of the cost of the

product it is applied to, and that date is somewhere near.

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2005 is the date that researchers say when radio frequency tagging becomes viable and until then,

we must wait and see.[8]

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REFERENCES

[1] Jay Warrior, Eric McHenry, Kenneth McGee, They know where you are, IEEE Spectrum, July

2003, pp.21-25

[2] Ankit Khare, RFID challenges barcoding, PC Quest, April 2003, pp.46

[3] Andy Emmerson, Tiny tags talk volumes, Everyday Practical Electronics, May 2001, pp.322

[4] Uma Gupta, RFID and beyond, Electronics For You, October 2003,

pp.36-40.

[5] Ulrich Kaiser, Wolfgang Steinhagen, A low-power transponder IC for high- performance

identification systems. IEEE Journal Of Solid-State Circuits.Vol.30, March 1995, pp306-310

[6] http://www.aimglobal.org

[7] http://www.ti.com[8] http://www.howstuffworks.com

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ABSTRACT

Long checkout lines at the grocery store are one of the biggest complaints about the shopping

experience. This is mainly due to the time consuming use of UPC barcodes. These codes act as product

fingerprints made of machine-readable parallel bars that store binary data.

Created in 1970s to speed up the checkout process, barcodes have certain disadvantages:

It is a read-only technology, which means it cannot send information.

It can easily be forged.

Barcode scanning is time consuming.

To overcome these, the barcodes are being replaced by smart labels, also called radiofrequency

identification tags.

RFID tags are intelligent barcodes that can literally talk to a networked system to track every

product that is bought.

The automotive industry also makes use of RFID batteryless transponders that offer a high level of

security at low cost. The theft of vehicles with electronic immobilizers decreased to about one-tenth

compared to those without immobilizers. This is based on the RFID technology.

RFID is a technology that uses radio signals for automatic identification by transmitting data in a

machine-readable form using radiofrequency as the carrier medium.

This paper gives an in-depth knowledge about RFID technology and its applications

CONTENTS

INTRODUCTION 1

TRANSPONDER 2

CLASSIFICATION OF TAGS 3

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READER/INTERROGATOR 6

RANGE AND POWER LEVELS 6

RFID SYSTEM 8

IMMOBILIZER SYSTEM 10

APPLICATIONS 23

ADVANTAGES 24

DISADVANTAGES 24

CONCLUSION 25

REFERENCES 26

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